\documentstyle[twoside, epsfig]{article}
\input ibvs2.sty
\begin{document}

\IBVShead{6015}{1 March 2012}

\IBVStitle{Photometry of High-Amplitude Delta Scuti Stars}

\IBVSauth{Wils, Patrick$^{1}$; Panagiotopoulos, Kostas$^{2,3}$; Van Wassenhove, Jeroen$^{1}$; Ayiomamitis, Anthony$^{2,4}$; Nieuwenhout, Frans$^{5}$; Robertson, C.W.$^{6}$; Vanleenhove, Maarten$^{1}$; Hambsch, Franz-Josef$^{1,7}$; Hautecler, Hubert$^{1}$; Pickard, Roger D.$^{8}$; Baillien, Antoine$^{1}$; Staels, Bart$^{1,9}$; Kleidis, Stelios$^{2,10}$; Lampens, Patricia$^{11}$; Van Cauteren, Paul$^{1,11}$}

\IBVSinst{Vereniging Voor Sterrenkunde, Belgium; e-mail: {\tt patrickwils@yahoo.com}}
\IBVSinst{Helliniki Astronomiki Enosi, Greece}
\IBVSinst{Pouda Observatory, Diakopto, Greece}
\IBVSinst{Perseus Observatory, Athens, Greece}  
\IBVSinst{Werkgroep Veranderlijke Sterren, The Netherlands}
\IBVSinst{SETEC Observatory, Goddard, Kansas, USA}  
\IBVSinst{Bundesdeutsche Arbeitsge\-mein\-schaft f\"{u}r Ver\"{a}nderliche Sterne e.V. Germany} % e-mail: hambsch@telenet.be
\IBVSinst{British Astronomical Association, UK} % e-mail:roger.pickard@sky.com
\IBVSinst{Center for Backyard Astrophysics Flanders}
\IBVSinst{Zagori Observatory, Epirus, Greece} % e-mail: steliosklidis@gmail.com
\IBVSinst{Koninklijke Sterrenwacht van Belgi\"e (ROB), Brussel, Belgium} % email: patricia.lampens@oma.be

\IBVStyp{ DSCT, SXPHE  }
\IBVSkey{CCD photometry} 

\IBVSabs{432 maxima of 64 High-Amplitude Delta Scuti Stars (HADS) obtained from CCD observations, are presented.  Observations of the newly discovered HADS GSC 3004-0870 are included.  The object GSC 1924-1134 was found to be a double-mode HADS, while GSC 1621-1643, GSC 2847-586 and GSC 3490-814 were found to be multiperiodic pulsators. GSC~4556-1113 is showing cyclical variations of the pulsation frequency with a period of 164 days.}

\begintext

In this paper we report 432 further times of maxima for 64 High-Amplitude Delta Scuti Stars (HADS),
following the reports of Wils et al. (2009, 2010, 2011).  The majority of the data were obtained during 2011.

The observers and their instruments are listed in Table~\ref{observers}.  
The times of maxima obtained are given as an Appendix in Table~\ref{Data}.  
When the same maximum was observed in more than one filter, 
the table shows the average value of the times obtained in each band individually. 
The method used to calculate the times of maximum is described in Wils et al. (2009).

\begin{table}
\begin{center}
\caption{List of instruments used for the observations.}
\label{observers}
\small
\begin{tabular}{lllll}
\hline
Code & Observer(s) & Telescope & Observatory & CCD \\
\hline
AA & AA & Refractor 16 cm & Perseus Observatory & SBIG ST-10XME \\
AA30 & AA & Refractor 30 cm  & Perseus Observatory & SBIG ST-10XME \\
AB & AB & Refractor 10 cm & Carpe Noctem Observatory & SBIG ST-9E \\
BHO & PL+PVC & Newton 25 cm & Beersel Hills Observatory  & SBIG ST-10XME \\
FN & FN & Catadioptric 40 cm  & Alkmaar, Nederland & SBIG ST-7XME \\
FN25 & FN & Catadioptric 25 cm & Alkmaar, Nederland & SBIG ST402XME \\
HHU & HH & Catadioptric 20 cm & Roosbeek Lake Observatory & SBIG ST-7XME \\
HMB4 & FJH & Catadioptric 35 cm  & Mol, Belgium  & SBIG ST-8 \\
HMB8 & FJH & Ritchey-Chr\'etien 20 cm & Mol, Belgium  & SBIG ST-8XME \\
HMBC & FJH & Catadioptric 28 cm & Mol, Belgium  & SBIG ST-10XME \\
HMBH & FJH & Hypergraph 40 cm  & Mol, Belgium  & SBIG STL-11000XM \\
KP & KP & Modified Cassegrain 26 cm & Pouda Observatory & SBIG ST-10XME \\
MAV & MV & Newton 25 cm & Leest Observatory & SBIG ST-10XME \\
RP & RDP & Catadioptric 36 cm & Shobdon, UK  & Starlight XPress SXV-H9 \\
SBL & BS & Cassegrain 28 + 23.5 cm  & Alan Guth Observatory & Starlight XPress MX-716 \\
SK & SK & Catadioptric 30 cm  & Zagori Observatory  & SBIG ST-7XMEI \\
SO30 & CWR & Catadioptric 30 cm  & SETEC Observatory  & SBIG ST-8XME \\
SO40 & CWR & Catadioptric 40 cm  & SETEC Observatory  & SBIG ST-8XME \\
VWS & JVW & Refractor 15.2 cm  & Hooglede, Belgium & SBIG ST-7XME \\
\hline
\end{tabular}
\normalsize
\end{center}
\end{table}


Elements for the previously unknown HADS GSC~3004-0870 (magnitude range 13.2-13.8$V$, J2000 position: 10\hr21\mm35\fsec33 +40\deg31\arcm41\farcs2)
are given in Table~\ref{Elements}, 
together with elements for a number of other stars that have been observed in detail the past year, 
or for which the existing ephemeris deviates substantially from our recent observations.
To get a better precision, use was made of data from the ASAS (Pojma\'nski, 2002), NSVS (Wo\'zniak et al., 2004) and SuperWASP surveys (Butters et al., 2010).

The star GSC~1924-1134 (= NSVS~7293918) discovered by Hoffman, Harrison and McNamara (2009) was found to be a double-mode HADS from observations by FN.
It is pulsating in the fundamental and first overtone modes, with a period ratio of 0.7737, 
typical of other stars of the class and period (Poretti et al., 2005).  
The independent frequencies, and their amplitudes and phases, determined using Period04 (Lenz \& Breger, 2005) are given in Table~\ref{Multi}.
The linear combinations $f_0+f_1$ and $2f_0+f_1$ of these independent frequencies were detected as well.

Some of the objects observed earlier turned out to be multiperiodic variables: 
V337~Ori (observations from MV, RDP and FN), GSC~1621-1643 (FJH), 
GSC~2847-0586 (FJH, KP and MV), GSC~3490-0814 = V1139~Her (KP, AA and MV) and GSC~4464-0924 (JVW and HH).
The frequencies detected in these stars are also listed in Table~\ref{Multi}.
In all of these stars also the combination frequency $f_0+f_1$ was detected.  
In V337~Ori the modes $2f_0+f_1$ and $f_1-f_0$ were detected as well.
In GSC~2847-0586, a possible third independent frequency may have been detected at 6.373~c/d, but with a signal-to-noise ratio of 4.0 it is barely significant.
For GSC~4464-0924 the influence of the secondary frequency on the time of maximum is negligible, 
so that its observed maxima are also included in Table~\ref{Data}.
A sample light curve of V1139~Her is given in Fig.~1.

The period of GSC~4556-1113 seems to vary cyclically.  
Especially during the recent data when the star was followed closely by JVW,
the $O-C$ varied with a period of $164\pm3$ days and an amplitude of $68\pm6$ seconds.  
The recent $O-C$ data, covering almost three of these cycles are given in Fig.~2.
If the origin of this cyclical variation is the light-travel time effect caused by an unknown companion in a circular orbit, 
some further details
can be calculated from the $O-C$ of the maxima or from the full light curve data as shown by Shibahashi \& Kurtz (2012).
Both methods give equivalent results.
It follows that the projected radius $a {\mathrm sin} i$ of the orbit of the pulsating star equals 0.137(5) AU, 
its projected orbital velocity 9.1\,($\pm$\,0.4) km/s.  
Finally the mass function $f(m_1, m_2, {\mathrm sin} i) = 0.0126(13) M_{\odot}$, suggesting the companion is a red dwarf.
Companions of HADS have been suggested before from $O-C$ data, but in many cases these are invalidated by further observations.
Only in the case of SZ~Lyn (Moffett et al., 1988) the presence of a companion is established without any doubt, 
as almost 16 cycles of the 1180 day orbital period have now been observed. 
Further observations are required to make sure the companion of GSC~4556-1113 is real as well.

GSC~4431-1487, one of the comparison stars used (for LW~Dra), was found to be variable by one of us (JVW). 
It turns out to be a W~UMa type variable with a period of 0.2548 days.
The photometry for this object, together with those from Table~\ref{Multi}, are available from the IBVS website.
GSC~1320-119 near V337~Ori is likely a new eclipsing variable with rare eclipses.  It was found to have faded by about 0.4 magnitudes on JD 2455623 by one of us (MV).

\IBVSfig{6cm}{6015-f1.eps}{One night of data of V1139~Her plotted with the model light curve 
with all detected frequencies.}
\IBVSfigKey{6015-f1.eps}{V1139~Her}{Light curve}

\IBVSfig{6cm}{6015-f2.eps}{$O-C$ graph of GSC~4556-1113 with respect to a linear ephemeris. 
A proposed cyclical model with a period of 164 days and an amplitude of 68 seconds is added as a dotted line.}
\IBVSfigKey{6015-f2.eps}{GSC 4556-1113}{O-C graph}

\begin{table}[!h]
\begin{center}
\caption{Updated elements of known HADS.  Uncertainties are given in units of the last decimal.}
\label{Elements}
\begin{tabular}{lll}
\hline
Star   & \multicolumn{1}{c}{Max (HJD)} & Period (d) \\
\hline
V376 Cam      & 2454823.4142(1) & 0.14032368(2) \\
GSC 2290-1195 & 2454410.548(3) & 0.0779984(3) \\
GSC 3004-0870 & 2455601.4482(4) & 0.08215879(2) \\
GSC 3428-1497 & 2455571.5826(3) & 0.07484470(3) \\
\hline
\end{tabular}
\end{center}
\end{table}


\begin{table}[!h]
\begin{center}
\caption{Independent frequencies detected in multiperiodic HADS.  Uncertainties are given in units of the last decimal.  
The phase is given with respect to HJD = 0.  Observations were obtained with a $V$ filter.}
\label{Multi}
\begin{tabular}{llr@{}lll}
\hline
Star   & \multicolumn{3}{c}{Frequency} & Semi-Amplitude & Phase \\
   & \multicolumn{3}{c}{c/d} & \multicolumn{1}{c}{Mag.} &  \\
\hline
V1139~Her & $f_0$ & 14 & .57979(4) & 0.0761(5) & 0.497(1) \\
 & $f_1$ & 13 & .7999(2) & 0.0195(5) & 0.993(4) \\
V337 Ori & $f_0$ & 4 & .968695(3) & 0.182(2) & 0.803(1) \\
 & $f_1$ & 6 & .72403(3) & 0.022(2) & 0.383(9) \\
GSC~1621-1643 & $f_0$ & 8 & .72095(8) & 0.135(1) & 0.235(1) \\
 & $f_1$ & 12 & .1152(4) & 0.022(1) & 0.763(9) \\
GSC~1924-1134 & $f_0$ & 11 & .29473(4) & 0.1914(6) & 0.0797(5) \\
 & $f_1$ & 14 & .5982(5) & 0.0169(7) & 0.062(6) \\
GSC~2847-0586 & $f_0$ & 7 & .077126(2) & 0.1136(4) & 0.0948(6) \\
 & $f_1$ & 6 & .95255(1) & 0.0171(4) & 0.339(4) \\
GSC~4464-0924 & $f_0$ & 12 & .402261(5) & 0.1807(5) & 0.0441(4) \\
 & $f_1$ & 18 & .54333(7) & 0.0113(5) & 0.801(7) \\
\hline
\end{tabular}
\end{center}
\end{table}

{\bf Acknowledgements:}\\
This work has made use of the SIMBAD database, operated at CDS, Strasbourg, France.
FN is grateful to the University of Amsterdam for providing a CCD camera with filter wheel.
Part of the equipment used at SETEC Observatory was purchased with a grant from the American Astronomical Society.
PVC is grateful for support from Astrotechniek \IBVSshortlink{http://www.astrotechniek.net}{www.astrotechniek.net}
and Baader Planetarium.  \IBVSshortlink{http://www.baader-planetarium.de}{www.baader-planetarium.de}
The BHO data were acquired with equipment purchased thanks to a
research fund financed by the Belgian National Lottery (1999).

\references

Butters O.W., West R.G., Anderson D.R., et al., 2010, {\it A\&A} {\bf 520}, L10

Hoffman D.I., Harrison T.E., McNamara B.J., 2009, {\it AJ} {\bf 138}, 466

Lenz P., Breger M., 2005, {\it Comm. in Asteroseismology} {\bf 146}, 53

Moffett T.J., Barnes III T.G., Fekel, Francis Jr. C., Jefferys W.H., Achtermann J.M., 1988, {\it AJ} {\bf 95}, 1534

Pojma\'nski G., 2002, {\it Acta Astron.} {\bf 52}, 397 

Poretti E., Su\'arez J.C., Niarchos P.G, et al., 2005, {\it A\&A} {\bf 440}, 1097

Shibahashi H., Kurtz D.W., 2012, arXiv:1202.0105 [astro-ph.SR]

Wils P., Kleidis S., Hambsch F.-J., Vidal-S\'ainz J., Vanleenhove M., Lampens P., Van Cauteren P., Robertson C.W., Staels B., Pickard R.D., Rozakis I., Dufoer S., Groenendaels R., G\'omez-Forrellad J.M., Garc\'{i}a-Melendo E., Hautecler H., Van der Looy J., 2009, {\it IBVS} {\bf 5878}

Wils P., Hambsch F.-J., Lampens P., Van Cauteren P., Staels B., Pickard R.D., Kleidis S., Van Wassenhove J., Otero S.A., Bellocchio E., Thienpont E., Vanleenhove M., 2010, {\it IBVS} {\bf 5928}

Wils P., Hambsch F.-J., Robertson C.W., Lampens P., Van Cauteren P., Hautecler H., Panagiotopoulos K., Van Wassenhove J., Staels B., Vanleenhove M., Hoste S., Pickard R.D., Kleidis S., Ayiomamitis A., Nieuwenhout F., Strigachev A., Bernhard K., 2011, {\it IBVS} {\bf 5977}

Wo\'zniak P.R., Vestrand W.T., Akerlof C.W., et al., 2004, {\it AJ} {\bf 127}, 2436

\endreferences


\begin{table}{Appendix:}
\begin{center}
\caption{Observed times of maximum (Epoch = HJD $-$ 2400000).}
\label{Data}
\small
\begin{tabular}{lllll|lllll}
\hline
Star & Epoch & Unc. & Obs. & Filter & Star & Epoch & Unc. & Obs. & Filter \\
\hline
GP And        & 55834.3764 & 0.0001 & KP   & BV   & YZ Boo        & 55669.6213 & 0.0009 & SBL  & V    \\
              & 55836.5010 & 0.0003 & FN   & V    &               & 55674.8256 & 0.0005 & SO40 & V    \\
              & 55836.5797 & 0.0003 & FN   & V    &               & 55689.7107 & 0.0004 & SO40 & V    \\
              & 55855.4635 & 0.0009 & HMB4 & V    &               & 55689.8148 & 0.0004 & SO40 & V    \\
              & 55856.4078 & 0.0010 & HMB4 & V    &               & 55705.3246 & 0.0013 & AA30 & C    \\
              & 55877.3372 & 0.0013 & HMB4 & V    &               & 55705.4286 & 0.0019 & AA30 & C    \\
              & 55877.4153 & 0.0015 & HMB4 & V    &               & 55707.4067 & 0.0004 & AA30 & C    \\
              & 55904.2470 & 0.0004 & KP   & V    &               & 55707.5102 & 0.0004 & AA30 & C    \\
              & 55904.3257 & 0.0004 & KP   & V    &               & 55718.6480 & 0.0006 & SO40 & V    \\
              & 55904.4042 & 0.0005 & KP   & V    &               & 55718.7523 & 0.0005 & SO40 & V    \\
V460 And      & 55590.3099 & 0.0008 & FN   & V    &               & 55718.8562 & 0.0005 & SO40 & V    \\
              & 55590.3844 & 0.0007 & FN   & V    &               & 55750.7084 & 0.0005 & SO40 & V    \\
              & 55590.4591 & 0.0003 & FN   & V    &               & 55750.8125 & 0.0008 & SO40 & V    \\
              & 55856.2666 & 0.0004 & HHU  & C    & BL Cam        & 55893.4535 & 0.0004 & AA30 & C    \\
              & 55856.3408 & 0.0002 & HHU  & C    &               & 55893.4924 & 0.0003 & AA30 & C    \\
              & 55889.6329 & 0.0005 & SO40 & V    &               & 55893.5318 & 0.0003 & AA30 & C    \\
              & 55889.7076 & 0.0007 & SO40 & V    &               & 55893.5710 & 0.0004 & AA30 & C    \\
              & 55889.7826 & 0.0003 & SO40 & V    & V367 Cam      & 55625.3385 & 0.0004 & HMB4 & VI   \\
              & 55889.8579 & 0.0004 & SO40 & V    &               & 55626.4331 & 0.0008 & HMB4 & VI   \\
              & 55889.9325 & 0.0006 & SO40 & V    &               & 55627.2837 & 0.0008 & HMB4 & V    \\
              & 55890.0072 & 0.0005 & SO40 & V    &               & 55627.4063 & 0.0010 & HMB4 & V    \\
              & 55893.6067 & 0.0004 & SO40 & V    &               & 55628.3786 & 0.0015 & HMB4 & V    \\
              & 55893.6820 & 0.0004 & SO40 & V    &               & 55629.3516 & 0.0009 & HMB4 & V    \\
              & 55893.7568 & 0.0005 & SO40 & V    &               & 55631.2980 & 0.0005 & SK   & BR   \\
              & 55893.8316 & 0.0007 & SO40 & V    &               & 55861.3568 & 0.0009 & MAV  & V    \\
              & 55893.9067 & 0.0006 & SO40 & V    &               & 55861.4784 & 0.0012 & MAV  & V    \\
              & 55893.9823 & 0.0006 & SO40 & V    & V376 Cam      & 55599.2639 & 0.0004 & KP   & V    \\
              & 55894.5813 & 0.0006 & SO40 & V    &               & 55599.4041 & 0.0004 & KP   & V    \\
              & 55894.6564 & 0.0003 & SO40 & V    &               & 55599.5444 & 0.0002 & KP   & V    \\
              & 55894.7316 & 0.0003 & SO40 & V    &               & 55643.3253 & 0.0007 & VWS  & V    \\
              & 55894.8064 & 0.0005 & SO40 & V    &               & 55643.4658 & 0.0003 & VWS  & V    \\
              & 55894.8812 & 0.0004 & SO40 & V    &               & 55646.2723 & 0.0004 & KP   & V    \\
              & 55894.9565 & 0.0005 & SO40 & V    &               & 55646.4127 & 0.0004 & KP   & V    \\
              & 55897.2054 & 0.0005 & AA30 & C    &               & 55649.3594 & 0.0004 & VWS  & V    \\
              & 55897.2808 & 0.0004 & AA30 & C    &               & 55715.4520 & 0.0003 & VWS  & V    \\
              & 55897.3556 & 0.0003 & AA30 & C    &               & 55848.3387 & 0.0006 & MAV  & V    \\
V524 And      & 55834.5624 & 0.0007 & FN   & V    &               & 55857.3194 & 0.0003 & VWS  & V    \\
              & 55834.6567 & 0.0006 & FN   & V    & AD CMi        & 55623.3957 & 0.0011 & HHU  & C    \\
              & 55838.2473 & 0.0009 & KP   & V    & V792 Cep      & 55839.3461 & 0.0009 & KP   & V    \\
              & 55838.3417 & 0.0007 & KP   & V    &               & 55839.4790 & 0.0005 & KP   & V    \\
              & 55838.4362 & 0.0004 & KP   & V    &               & 55839.6125 & 0.0005 & KP   & V    \\
              & 55875.2877 & 0.0004 & HHU  & C    & XX Cyg        & 55729.4472 & 0.0006 & HHU  & C    \\
              & 55905.3365 & 0.0006 & KP   & V    &               & 55751.6988 & 0.0002 & SO40 & V    \\
              & 55905.4308 & 0.0008 & KP   & V    &               & 55751.8337 & 0.0003 & SO40 & V    \\
              & 55905.5250 & 0.0010 & KP   & V    &               & 55799.7108 & 0.0002 & SO40 & V    \\
V544 And      & 55851.2895 & 0.0004 & HHU  & C    &               & 55804.7008 & 0.0002 & SO40 & V    \\
              & 55870.2183 & 0.0006 & KP   & V    &               & 55804.8357 & 0.0002 & SO40 & V    \\
              & 55870.3251 & 0.0004 & KP   & V    &               & 55809.6908 & 0.0002 & SO40 & V    \\
              & 55870.4321 & 0.0004 & KP   & V    &               & 55809.8257 & 0.0002 & SO40 & V    \\
              & 55870.5389 & 0.0005 & KP   & V    &               & 55866.3353 & 0.0006 & HHU  & C    \\
CY Aqr        & 55833.3662 & 0.0004 & HHU  & C    & V2455 Cyg     & 55820.3878 & 0.0011 & HHU  & C    \\
              & 55848.3207 & 0.0004 & KP   & V    &               & 55855.3385 & 0.0004 & HHU  & C    \\
              & 55905.2695 & 0.0001 & HHU  & C    & LW Dra        & 55676.4152 & 0.0006 & VWS  & V    \\
YZ Boo        & 55604.4597 & 0.0004 & KP   & B    &               & 55706.4260 & 0.0008 & VWS  & V    \\
              & 55604.5637 & 0.0003 & KP   & B    &               & 55799.6521 & 0.0013 & SO30 & V    \\
              & 55604.6675 & 0.0002 & KP   & B    &               & 55824.3433 & 0.0007 & VWS  & V    \\
              & 55669.4122 & 0.0015 & SBL  & V    &               & 55829.4235 & 0.0007 & VWS  & V    \\
              & 55669.5166 & 0.0012 & SBL  & V    &               & 55832.3773 & 0.0007 & VWS  & V    \\
\hline
\end{tabular}
\normalsize
\end{center}
\end{table}

\setcounter{table}{3}
\begin{table}
\begin{center}
\caption{Observed times of maximum (continued).}
\small
\begin{tabular}{lllll|lllll}
\hline
Star & Epoch & Unc. & Obs. & Filter & Star & Epoch & Unc. & Obs. & Filter \\
\hline
LW Dra        & 55833.3230 & 0.0006 & VWS  & V    & DW Psc        & 55894.3975 & 0.0003 & KP   & C    \\
              & 55833.4410 & 0.0006 & VWS  & V    &               & 55895.2326 & 0.0004 & KP   & C    \\
              & 55834.3861 & 0.0009 & VWS  & V    &               & 55895.2921 & 0.0007 & KP   & C    \\
              & 55836.3946 & 0.0009 & VWS  & V    & GW UMa        & 55579.5936 & 0.0008 & KP   & V    \\
              & 55849.3916 & 0.0009 & VWS  & V    &               & 55580.4056 & 0.0018 & RP   & V    \\
              & 55878.4574 & 0.0009 & VWS  & V    &               & 55580.6099 & 0.0012 & RP   & V    \\
DY Her        & 55718.7057 & 0.0006 & SO30 & V    &               & 55604.3831 & 0.0009 & AA   & C    \\
              & 55718.8540 & 0.0005 & SO30 & V    &               & 55672.4532 & 0.0017 & RP   & V    \\
              & 55750.8095 & 0.0006 & SO30 & V    & QV Vir        & 55633.4015 & 0.0018 & AA   & C    \\
              & 55751.7018 & 0.0008 & SO30 & V    &               & 55633.4680 & 0.0010 & AA   & C    \\
              & 55751.8501 & 0.0003 & SO30 & V    &               & 55633.5352 & 0.0007 & AA   & C    \\
KZ Hya        & 55601.4111 & 0.0003 & AA   & C    &               & 55633.6029 & 0.0014 & AA   & C    \\
              & 55601.4705 & 0.0002 & AA   & C    & GSC 0191-1282 & 55623.2787 & 0.0011 & HMBC & V    \\
              & 55601.5298 & 0.0002 & AA   & C    &               & 55623.3257 & 0.0005 & HMBC & V    \\
KZ Lac        & 55833.5293 & 0.0015 & FN   & V    &               & 55623.3739 & 0.0008 & HMBC & V    \\
              & 55833.6334 & 0.0019 & FN   & V    &               & 55623.4202 & 0.0007 & HMBC & V    \\
              & 55849.5041 & 0.0012 & FN   & V    &               & 55624.4171 & 0.0003 & HMBC & V    \\
              & 55849.6087 & 0.0020 & FN   & V    &               & 55628.3523 & 0.0005 & FN25 & V    \\
              & 55854.4116 & 0.0007 & KP   & V    &               & 55628.3991 & 0.0003 & FN25 & V    \\
              & 55854.5154 & 0.0010 & KP   & V    &               & 55635.2758 & 0.0006 & AA   & C    \\
              & 55854.6197 & 0.0015 & KP   & V    &               & 55635.3226 & 0.0006 & AA   & C    \\
              & 55869.2386 & 0.0013 & KP   & V    &               & 55635.3708 & 0.0007 & AA   & C    \\
              & 55869.3433 & 0.0011 & KP   & V    & GSC 0321-0314 & 55677.4380 & 0.0005 & HHU  & C    \\
              & 55869.4467 & 0.0010 & KP   & V    & GSC 0429-2098 & 55715.4915 & 0.0008 & HHU  & C    \\
EH Lib        & 55675.4272 & 0.0002 & AA   & C    & GSC 0612-0771 & 55849.5056 & 0.0007 & HMB8 & V    \\
              & 55675.5156 & 0.0002 & AA   & C    & GSC 0753-1489 & 55589.4289 & 0.0004 & HHU  & C    \\
SZ Lyn        & 55583.5449 & 0.0008 & RP   & V    &               & 55627.3805 & 0.0005 & MAV  & V    \\
              & 55583.6652 & 0.0007 & RP   & V    & GSC 1076-0158 & 55775.4294 & 0.0007 & HHU  & C    \\
              & 55587.6425 & 0.0008 & SO30 & V    &               & 55850.3085 & 0.0007 & FN   & V    \\
              & 55587.7633 & 0.0005 & SO30 & V    &               & 55850.3955 & 0.0010 & FN   & V    \\
              & 55587.8839 & 0.0006 & SO30 & V    & GSC 1158-0921 & 55824.3442 & 0.0006 & MAV  & V    \\
              & 55588.6074 & 0.0008 & SO30 & V    &               & 55824.4089 & 0.0007 & MAV  & V    \\
              & 55588.7273 & 0.0015 & SO30 & V    &               & 55836.4205 & 0.0004 & FN   & V    \\
              & 55588.8483 & 0.0007 & SO30 & V    &               & 55849.3368 & 0.0006 & HMB8 & V    \\
              & 55588.9688 & 0.0008 & SO30 & V    &               & 55849.4013 & 0.0006 & HMB8 & V    \\
              & 55629.3475 & 0.0004 & HHU  & C    &               & 55849.4656 & 0.0008 & HMB8 & V    \\
V593 Lyr      & 55703.4063 & 0.0004 & AA30 & C    &               & 55850.3060 & 0.0005 & HMB8 & V    \\
              & 55703.5085 & 0.0003 & AA30 & C    &               & 55850.3701 & 0.0005 & HMB8 & V    \\
              & 55782.4717 & 0.0004 & RP   & V    &               & 55850.4344 & 0.0006 & HMB8 & V    \\
              & 55834.3640 & 0.0006 & AB   & C    &               & 55853.2765 & 0.0005 & KP   & V    \\
V1162 Ori     & 55590.6022 & 0.0010 & SO30 & V    &               & 55853.3410 & 0.0005 & KP   & V    \\
              & 55590.6793 & 0.0011 & SO30 & V    &               & 55899.2570 & 0.0006 & AA30 & C    \\
              & 55590.7584 & 0.0015 & SO30 & V    & GSC 1220-1131 & 55578.2621 & 0.0007 & HHU  & C    \\
              & 55591.3082 & 0.0018 & BHO  & V    &               & 55855.4001 & 0.0012 & HHU  & C    \\
DY Peg        & 55806.3643 & 0.0004 & MAV  & V    & GSC 1306-0466 & 55571.4641 & 0.0004 & HHU  & C    \\
              & 55806.4374 & 0.0005 & MAV  & V    &               & 55601.4275 & 0.0021 & AB   & C    \\
              & 55848.4427 & 0.0004 & FN   & V    &               & 55630.3555 & 0.0017 & FN25 & V    \\
              & 55848.5157 & 0.0002 & FN   & V    & GSC 1442-1358 & 55601.5056 & 0.0008 & HMBC & V    \\
              & 55854.2768 & 0.0003 & KP   & V    &               & 55601.5872 & 0.0005 & HMBC & V    \\
              & 55854.3501 & 0.0002 & KP   & V    &               & 55601.6691 & 0.0003 & HMBC & V    \\
              & 55903.2832 & 0.0012 & RP   & V    &               & 55660.3804 & 0.0004 & HHU  & C    \\
              & 55903.3564 & 0.0004 & RP   & V    &               & 55674.3394 & 0.0007 & AA   & C    \\
              & 55903.4292 & 0.0002 & RP   & V    &               & 55674.4213 & 0.0008 & AA   & C    \\
DW Psc        & 55850.4960 & 0.0008 & FN   & V    & GSC 1750-1237 & 55837.5423 & 0.0006 & FN   & V    \\
              & 55850.5561 & 0.0005 & FN   & V    &               & 55877.3779 & 0.0008 & HMB8 & V    \\
              & 55894.2197 & 0.0006 & KP   & C    & GSC 2043-1201 & 55688.3253 & 0.0011 & AA   & C    \\
              & 55894.2788 & 0.0002 & KP   & C    &               & 55688.4027 & 0.0008 & AA   & C    \\
              & 55894.3379 & 0.0003 & KP   & C    &               & 55688.4805 & 0.0009 & AA   & C    \\
\hline
\end{tabular}
\normalsize
\end{center}
\end{table}

\setcounter{table}{3}
\begin{table}
\begin{center}
\caption{Observed times of maximum (continued).}
\small
\begin{tabular}{lllll|lllll}
\hline
Star & Epoch & Unc. & Obs. & Filter & Star & Epoch & Unc. & Obs. & Filter \\
\hline
GSC 2043-1201 & 55688.5584 & 0.0006 & AA   & C    & GSC 3428-1497 & 55571.6567 & 0.0008 & HMB8 & V    \\
GSC 2080-0986 & 55834.3094 & 0.0007 & FN   & V    &               & 55571.7318 & 0.0009 & HMB8 & V    \\
              & 55834.4085 & 0.0007 & FN   & V    &               & 55625.3220 & 0.0009 & HHU  & C    \\
GSC 2108-1564 & 55739.4349 & 0.0008 & HMB8 & V    &               & 55673.2974 & 0.0008 & AA   & C    \\
              & 55739.5327 & 0.0010 & HMB8 & V    &               & 55673.3709 & 0.0007 & AA   & C    \\
              & 55835.3969 & 0.0012 & AB   & C    &               & 55673.4463 & 0.0012 & AA   & C    \\
GSC 2290-1195 & 55500.4988 & 0.0012 & FN   & V    &               & 55673.5202 & 0.0015 & AA   & C    \\
              & 55500.5749 & 0.0009 & FN   & V    &               & 55880.4685 & 0.0010 & MAV  & V    \\
              & 55838.3855 & 0.0013 & HHU  & C    & GSC 3483-0746 & 55682.4568 & 0.0008 & RP   & V    \\
GSC 2566-1398 & 55659.4801 & 0.0008 & RP   & V    &               & 55682.5691 & 0.0007 & RP   & V    \\
              & 55659.5712 & 0.0006 & RP   & V    & GSC 3489-0868 & 55713.3338 & 0.0008 & AA30 & C    \\
              & 55714.3586 & 0.0006 & AA30 & C    &               & 55713.4204 & 0.0004 & AA30 & C    \\
              & 55714.4492 & 0.0005 & AA30 & C    &               & 55729.3637 & 0.0005 & AA30 & C    \\
              & 55714.5394 & 0.0005 & AA30 & C    &               & 55729.4504 & 0.0005 & AA30 & C    \\
GSC 2696-1396 & 55829.3994 & 0.0005 & HHU  & C    &               & 55729.5369 & 0.0007 & AA30 & C    \\
              & 55880.3186 & 0.0004 & FN   & V    & GSC 3755-0845 & 55571.2812 & 0.0011 & SBL  & V    \\
GSC 2843-1999 & 55572.3925 & 0.0028 & HMB8 & V    &               & 55629.3439 & 0.0007 & FN   & V    \\
              & 55578.3535 & 0.0022 & HMB8 & V    &               & 55834.4275 & 0.0014 & MAV  & V    \\
              & 55829.3389 & 0.0007 & MAV  & V    &               & 55834.5032 & 0.0009 & MAV  & V    \\
              & 55829.4010 & 0.0008 & MAV  & V    &               & 55835.4178 & 0.0015 & MAV  & V    \\
              & 55829.4625 & 0.0007 & MAV  & V    &               & 55835.4938 & 0.0015 & MAV  & V    \\
              & 55856.2877 & 0.0006 & MAV  & V    &               & 55835.5686 & 0.0012 & MAV  & V    \\
              & 55856.3499 & 0.0006 & MAV  & V    &               & 55893.2514 & 0.0007 & MAV  & V    \\
              & 55856.4122 & 0.0005 & MAV  & V    &               & 55893.3274 & 0.0007 & MAV  & V    \\
              & 55856.4741 & 0.0005 & MAV  & V    &               & 55893.4034 & 0.0008 & MAV  & V    \\
              & 55880.2561 & 0.0008 & MAV  & V    &               & 55893.4037 & 0.0015 & AB   & C    \\
              & 55880.3184 & 0.0007 & MAV  & V    &               & 55905.4261 & 0.0018 & RP   & V    \\
              & 55880.3798 & 0.0007 & MAV  & V    &               & 55905.5040 & 0.0021 & RP   & V    \\
              & 55887.2110 & 0.0005 & AA30 & C    &               & 55905.5797 & 0.0019 & RP   & V    \\
              & 55887.2729 & 0.0006 & AA30 & C    &               & 55905.6554 & 0.0012 & RP   & V    \\
              & 55887.3351 & 0.0007 & AA30 & C    & GSC 3832-0152 & 55569.4240 & 0.0004 & KP   & V    \\
              & 55887.3972 & 0.0006 & AA30 & C    &               & 55569.5153 & 0.0004 & KP   & V    \\
              & 55887.4589 & 0.0004 & AA30 & C    &               & 55569.6065 & 0.0004 & KP   & V    \\
GSC 2861-0970 & 55571.4510 & 0.0007 & HMB8 & V    &               & 55569.6979 & 0.0003 & KP   & V    \\
              & 55594.3531 & 0.0005 & RP   & C    &               & 55641.3103 & 0.0016 & HHU  & C    \\
              & 55641.3678 & 0.0005 & FN   & V    &               & 55641.4015 & 0.0008 & HHU  & C    \\
              & 55859.2661 & 0.0006 & MAV  & V    &               & 55643.5027 & 0.0009 & RP   & V    \\
              & 55859.3763 & 0.0007 & MAV  & V    &               & 55655.5595 & 0.0005 & RP   & V    \\
              & 55882.2786 & 0.0006 & MAV  & V    &               & 55655.6509 & 0.0006 & RP   & V    \\
              & 55882.3884 & 0.0006 & MAV  & V    &               & 55672.3665 & 0.0007 & HHU  & C    \\
GSC 2977-0238 & 55570.3886 & 0.0002 & KP   & V    &               & 55672.4576 & 0.0005 & HHU  & C    \\
              & 55570.4645 & 0.0003 & KP   & V    &               & 55684.4238 & 0.0004 & FN25 & V    \\
              & 55592.4880 & 0.0013 & RP   & C    &               & 55684.5154 & 0.0004 & FN25 & V    \\
              & 55592.5619 & 0.0007 & RP   & C    &               & 55684.6067 & 0.0003 & FN25 & V    \\
              & 55592.6379 & 0.0007 & RP   & C    & GSC 3863-0740 & 55576.5371 & 0.0022 & KP   & C    \\
              & 55592.7138 & 0.0010 & RP   & C    &               & 55646.5217 & 0.0017 & RP   & V    \\
              & 55629.3900 & 0.0004 & FN25 & V    &               & 55649.2944 & 0.0032 & KP   & V    \\
              & 55644.2727 & 0.0004 & KP   & V    &               & 55676.5745 & 0.0023 & RP   & V    \\
              & 55675.4058 & 0.0005 & FN   & V    &               & 55866.3658 & 0.0017 & MAV  & V    \\
GSC 3004-0870 & 55601.4481 & 0.0003 & HHU  & C    & GSC 3934-1904 & 55729.5173 & 0.0008 & HMBH & C    \\
              & 55627.4103 & 0.0006 & HHU  & C    &               & 55836.3808 & 0.0033 & AB   & C    \\
              & 55641.3780 & 0.0012 & AB   & C    & GSC 4417-0394 & 55603.5225 & 0.0008 & KP   & V    \\
              & 55683.3606 & 0.0014 & FN   & V    &               & 55603.6546 & 0.0007 & KP   & V    \\
              & 55683.4428 & 0.0008 & FN   & V    &               & 55730.3444 & 0.0008 & AA30 & C    \\
GSC 3074-0114 & 55639.4398 & 0.0007 & AA   & C    &               & 55730.4767 & 0.0006 & AA30 & C    \\
              & 55639.4911 & 0.0006 & AA   & C    & GSC 4464-0924 & 55582.2948 & 0.0005 & VWS  & V    \\
              & 55639.5423 & 0.0009 & AA   & C    &               & 55582.3750 & 0.0003 & VWS  & V    \\
GSC 3428-1497 & 55571.5826 & 0.0007 & HMB8 & V    &               & 55591.3250 & 0.0017 & VWS  & V    \\
\hline
\end{tabular}
\normalsize
\end{center}
\end{table}

\setcounter{table}{3}
\begin{table}
\begin{center}
\caption{Observed times of maximum (continued).}
\small
\begin{tabular}{lllll|lllll}
\hline
Star & Epoch & Unc. & Obs. & Filter & Star & Epoch & Unc. & Obs. & Filter \\
\hline
GSC 4464-0924 & 55661.3921 & 0.0009 & VWS  & V    & GSC 4556-1113 & 55684.4712 & 0.0004 & VWS  & V    \\
              & 55661.4740 & 0.0006 & VWS  & V    &               & 55686.3710 & 0.0004 & VWS  & V    \\
              & 55661.5532 & 0.0010 & VWS  & V    &               & 55686.4574 & 0.0004 & VWS  & V    \\
              & 55670.3415 & 0.0006 & VWS  & V    &               & 55702.4313 & 0.0003 & VWS  & V    \\
              & 55670.4239 & 0.0007 & VWS  & V    &               & 55714.4334 & 0.0003 & VWS  & V    \\
              & 55670.5034 & 0.0010 & VWS  & V    &               & 55742.4949 & 0.0004 & VWS  & V    \\
              & 55670.5855 & 0.0009 & VWS  & V    &               & 55745.4306 & 0.0005 & VWS  & V    \\
              & 55716.4635 & 0.0004 & VWS  & V    &               & 55745.5171 & 0.0004 & VWS  & V    \\
              & 55836.3616 & 0.0006 & HHU  & C    &               & 55774.4413 & 0.0004 & VWS  & V    \\
              & 55866.2748 & 0.0004 & VWS  & V    &               & 55793.4361 & 0.0004 & VWS  & V    \\
              & 55866.3554 & 0.0012 & VWS  & V    &               & 55807.4235 & 0.0004 & VWS  & V    \\
              & 55906.2670 & 0.0015 & VWS  & V    &               & 55819.3387 & 0.0007 & VWS  & V    \\
              & 55906.3483 & 0.0005 & VWS  & V    &               & 55819.4251 & 0.0004 & VWS  & V    \\
GSC 4500-0083 & 55601.3466 & 0.0017 & HHU  & C    &               & 55834.5353 & 0.0005 & VWS  & V    \\
              & 55818.3532 & 0.0018 & MAV  & V    &               & 55834.6216 & 0.0005 & VWS  & V    \\
              & 55818.4399 & 0.0016 & MAV  & V    &               & 55849.5593 & 0.0005 & VWS  & V    \\
              & 55836.3027 & 0.0019 & KP   & V    &               & 55849.6457 & 0.0003 & VWS  & V    \\
              & 55836.3869 & 0.0010 & KP   & V    &               & 55856.2944 & 0.0003 & VWS  & V    \\
GSC 4552-1498 & 55580.4278 & 0.0002 & KP   & C    &               & 55856.3807 & 0.0004 & VWS  & V    \\
              & 55580.4838 & 0.0003 & KP   & C    &               & 55856.4673 & 0.0003 & VWS  & V    \\
              & 55580.5394 & 0.0002 & KP   & C    &               & 55877.2764 & 0.0002 & VWS  & V    \\
              & 55580.5952 & 0.0003 & KP   & C    &               & 55893.2498 & 0.0003 & VWS  & V    \\
              & 55580.6512 & 0.0003 & KP   & C    &               & 55893.3361 & 0.0003 & VWS  & V    \\
              & 55640.3689 & 0.0003 & HHU  & C    &               & 55905.4242 & 0.0004 & VWS  & V    \\
              & 55640.3693 & 0.0003 & FN   & V    & GSC 4638-0455 & 55605.4094 & 0.0005 & KP   & V    \\
              & 55640.4251 & 0.0003 & FN   & V    &               & 55605.5059 & 0.0005 & KP   & V    \\
              & 55646.2850 & 0.0003 & AA   & C    &               & 55605.6026 & 0.0004 & KP   & V    \\
              & 55646.3407 & 0.0004 & AA   & C    &               & 55625.4078 & 0.0005 & VWS  & V    \\
              & 55646.3967 & 0.0003 & AA   & C    &               & 55660.3807 & 0.0005 & VWS  & V    \\
              & 55646.4523 & 0.0003 & AA   & C    & GSC 4923-0693 & 55655.3007 & 0.0009 & AA   & C    \\
              & 55683.3999 & 0.0003 & FN25 & V    &               & 55655.3663 & 0.0009 & AA   & C    \\
GSC 4556-1113 & 55571.2772 & 0.0003 & VWS  & V    &               & 55655.4332 & 0.0009 & AA   & C    \\
              & 55571.3631 & 0.0003 & VWS  & V    &               & 55661.4215 & 0.0007 & AB   & C    \\
              & 55571.4494 & 0.0004 & VWS  & V    &               & 55663.4194 & 0.0006 & RP   & V    \\
              & 55605.2952 & 0.0004 & VWS  & V    &               & 55663.4854 & 0.0008 & RP   & V    \\
              & 55605.3817 & 0.0003 & VWS  & V    & GSC 5018-1085 & 55676.3172 & 0.0008 & AA   & C    \\
              & 55609.3532 & 0.0004 & VWS  & V    &               & 55676.3857 & 0.0004 & AA   & C    \\
              & 55623.3407 & 0.0004 & VWS  & V    &               & 55676.4546 & 0.0004 & AA   & C    \\
              & 55623.4270 & 0.0003 & VWS  & V    &               & 55676.5236 & 0.0004 & AA   & C    \\
              & 55624.3767 & 0.0004 & VWS  & V    & NSVS 11672463 & 55832.3697 & 0.0006 & HHU  & C    \\
              & 55658.3954 & 0.0003 & VWS  & V    &               & 55866.3021 & 0.0008 & FN   & V    \\
              & 55684.3849 & 0.0004 & VWS  & V    & NSVS 14243430 & 55832.3942 & 0.0024 & FN   & V    \\
\hline
\end{tabular}
\normalsize
\end{center}
\end{table}

\IBVSedata{6015-t4.txt}
\IBVSedata{6015-t5.txt}
\IBVSedata{6015-t6.txt}
\IBVSedata{6015-t7.txt}
\IBVSedata{6015-t8.txt}
\IBVSedata{6015-t9.txt}
\IBVSedata{6015-t10.txt}
\IBVSedata{6015-t11.txt}
\IBVSedata{6015-t12.txt}
\IBVSedata{6015-t13.txt}
\IBVSedata{6015-t14.txt}
\IBVSedata{6015-t15.txt}
\IBVSedata{6015-t16.txt}
\IBVSedata{6015-t17.txt}
\IBVSedata{6015-t18.txt}
\IBVSedata{6015-t19.txt}

\end{document}
