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

\IBVShead{5928}{8 March 2010}

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

\IBVSauth{Wils, Patrick$^{1}$; Hambsch, Franz-Josef$^{1,2}$; Lampens, Patricia$^{3,4}$; Van Cauteren, Paul$^{1,4}$; Staels, Bart$^{1,5}$; Pickard, Roger D.$^{6}$; Kleidis, Stelios$^{7,8}$; Van Wassenhove, Jeroen$^{1}$; Otero, Sebasti\'an A.$^{9,10}$; Bellocchio, Ezequiel$^{10}$; Thienpont, Emmanuel$^{1}$; Vanleenhove, Maarten$^{1}$}

\IBVSinst{Vereniging Voor Sterrenkunde, Belgium; e-mail: {\tt patrickwils@yahoo.com}}
\IBVSinst{Bundesdeutsche Arbeitsge\-mein\-schaft f\"{u}r Ver\"{a}nderliche Sterne e.V. Germany} % e-mail: hambsch@telenet.be
\IBVSinst{Royal Observatory of Belgium, Brussels, Belgium} % email: patricia.lampens@oma.be
\IBVSinst{Beersel Hills Observatory, Beersel, Belgium} % email: paulvancauteren@skynet.be
\IBVSinst{Center for Backyard Astrophysics}
\IBVSinst{British Astronomical Association, UK} % e-mail:roger.pickard@sky.com
\IBVSinst{Zagori Observatory, Epirus, Greece} % e-mail: steliosklidis@gmail.com
\IBVSinst{Helliniki Astronomiki Enosi, Athens, Greece}
\IBVSinst{Asociaci\'on Cielo Sur, Grupo Wezen 1 88, Buenos Aires, Argentina}
\IBVSinst{Astropilar Observatory, Buenos Aires, Argentina}

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

\IBVSabs{218 maxima of 25 High-Amplitude Delta Scuti Stars (HADS)}
\IBVSabs{obtained from CCD observations, are presented.}


\begintext

\vspace*{-1cm}

We report further times of maximum for a number of High-Amplitude Delta Scuti Stars (HADS),
following the report of Wils et al. (2009).
For the first time, time series photometry was obtained for GSC~2815-790 (Khruslov, 2008),
and for the following objects found to be variable in ASAS-3 data (Pojmanski, 2002): 
GSC~2108-1564 (= HD~343024 = ASAS~184744+2313.2), GSC~4923-693 (= ASAS~112518-0047.3), 
GSC~6678-0579 \\(= ASAS~115336-2905.9) and GSC~7027-0700 (= ASAS~033219-3539.3), confirming these stars to be $\delta$ Scuti stars.
Three stars known to be multi-periodic are included as well in this paper.
For these stars a second frequency was not detected in our data 
(AN~Lyn, see Zhou, 2002 and V1162~Ori, see Arentoft, 2001), 
or, in the case of BL Cam, the amplitude of the secondary frequency is so low compared to the main frequency, 
that it does not significantly alter the time of maximum.
Although we have only one night of data, GSC~6678-0579 is likely to be multiperiodic as well.

The method used to calculate the times of maximum is described in Wils et al. (2009).
The templates used to fit the light curves for those stars not included in that paper are available electronically through the IBVS website as {\tt 5928-t3.txt} 
These have been calculated using Period04 (Lenz \& Breger, 2005).

\IBVSedata{5928-t3.txt}
\IBVSdataKey{5928-t3.txt}{}{photometry}

The observers and their instruments are given in Table~\ref{observers}.  
The 218 times of maximum obtained for 25 HADS are listed 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 filter individually. 
The suggestion of a companion in a 22-year orbit around AN~Lyn (Hintz~et~al.,~2005) does not seem to be confirmed by our data.
A linear ephemeris which better fits the available data since 2000 (Zhou, 2002; Agerer \&  H\"ubscher, 2003; Hintz~et~al.,~2005;
H\"ubscher, 2005; H\"ubscher et al., 2005, 2006; Klingenberg et al., 2006 and from this paper)
is given by:

\begin{equation}
\label{Max ANLyn}
  {\rm HJD\ Max} = 2451583.0767(3) + 0.098274972(13) \times E
\end{equation}

Fig.~1 shows an $O-C$ plot using this ephemeris of these data, and also including older data discussed by Hintz et al. (2005).
The period is slightly longer (0.18 seconds) than the one derived by these authors.
The $O-C$ plot also assumes that they miscounted the number of cycles in the ten year gap 
between the observations in the 1980s and 1990s (one cycle too many).

\begin{table}[!hr]
\vspace*{-0.8cm}
\begin{center}
\caption{List of instruments used for the observations.}
\label{observers}
\small
\hspace*{-0.5cm}
\begin{tabular}{lllrll}
\hline
Code & Observers & Telescope type & Aperture & Observatory & CCD \\
\hline
AO1 & SO+EB & Refractor  & 9 cm & Astropilar Observatory & SBIG ST-10XME \\
AO2 & SO+EB & Catadioptric  & 25 cm & Astropilar Observatory & SBIG ST-10XME \\
BHO1 & PL+PVC & Refractor  & 18 cm  & Beersel Hills Observatory  & SBIG ST-10XME \\
BHO2 & PL+PVC & Newton  & 40 cm  & Beersel Hills Observatory  & SBIG ST-10XME \\
ET & ET & Newton  & 25 cm & Pegasus Observatory Brakel & SBIG ST402-ME \\
HMB & FJH & Cassegrain  & 28, 35, 40 cm  & Mol, Belgium  & SBIG ST-8 \\
HMB2 & FJH & Ritchey-Chr\'etien  & 50 cm  & New Mexico, USA  & STL11000XM \\
HO18 & PL+PVC & Refractor  & 18 cm  & R.O.B.-Humain  & SBIG ST-10XME \\
HO40 & PL+PVC & Newton  & 40 cm  & R.O.B.-Humain  & SBIG ST-10XME \\
JVW & JVW & Refractor  & 8 cm  & Hooglede, Belgium & SBIG ST-7XME \\
MVL & MVL & Catadioptric  & 26 cm  & Willebroek Observatory  & SBIG ST-10XME \\
RP & RDP & Catadioptric  & 30 cm  & Shobdon, UK  & Starlight XPress SXV-H9 \\
SBL & BS & Cassegrain  & 28, 23.5 cm  & Patrick Mergan Observatory  & Starlight XPress MX-716 \\
SK & SK & Catadioptric  & 30 cm  & Zagori Observatory  & SBIG ST-7XMEI \\
\hline
\end{tabular}
\normalsize
\end{center}
\vspace*{-1cm}
\end{table}

\IBVSfig{8cm}{5928-f1.eps}{$O-C$ curve of AN~Lyn with respect to the elements given in Eq.~\ref{Max ANLyn}. }
\IBVSfigKey{5928-f1.eps}{AN Lyn}{O-C curve}

%\clearpage
{\bf Acknowledgements:}\\
This work has made use of the SIMBAD database, operated at CDS, Strasbourg, France.
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}.
PL thanks the directors of the Royal Observatory of Belgium
(ROB) for purchasing and operating an optical telescope at the
radio-astronomy site of Humain under the project name {\it HOACS} (Humain Optical Observatory for
Astrophysics of Coeval Stars). The BHO and {\it HOACS} data were acquired with equipment purchased thanks to a
research fund financed by the Belgian National Lottery (1999). \break
%Changed: Wed Mar 10 08:18:30 Europe/Budapest 2010


\IBVSetable{5928-t2.tex}

\begin{table}
\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        & 55155.3448 & 0.0007 & HMB  & V    & AN Lyn        & 54890.6197 & 0.0006 & HMB2 & BV   \\
              & 55155.5017 & 0.0009 & HMB  & V    &               & 54890.7170 & 0.0012 & HMB2 & BV   \\
              & 55172.3392 & 0.0009 & HMB  & V    &               & 54891.7006 & 0.0016 & HMB2 & BV   \\
              & 55172.4183 & 0.0013 & HMB  & V    &               & 54892.6821 & 0.0018 & HMB2 & BV   \\
              & 55204.3636 & 0.0013 & HMB  & V    &               & 54893.6677 & 0.0019 & HMB2 & BV   \\
V460 And      & 55192.3112 & 0.0005 & HMB  & V    &               & 54901.6265 & 0.0026 & HMB2 & V    \\
              & 55192.3863 & 0.0012 & HMB  & V    &               & 54901.7236 & 0.0023 & HMB2 & V    \\
YZ Boo        & 54891.5364 & 0.0008 & HMB  & V    &               & 54901.8180 & 0.0020 & HMB2 & V    \\
              & 54891.6405 & 0.0006 & HMB  & V    &               & 54901.9206 & 0.0036 & HMB2 & V    \\
              & 54906.5261 & 0.0007 & SBL  & V    &               & 54928.6517 & 0.0013 & HMB2 & BV   \\
              & 54906.6292 & 0.0007 & SBL  & V    &               & 54928.7482 & 0.0025 & HMB2 & BV   \\
              & 54931.4034 & 0.0008 & SBL  & V    &               & 54934.6456 & 0.0009 & HMB2 & BV   \\
              & 54931.5075 & 0.0009 & SBL  & V    &               & 54934.7457 & 0.0025 & HMB2 & BV   \\
              & 54974.4971 & 0.0008 & ET   & V    & V593 Lyr      & 54941.5634 & 0.0007 & HMB  & V    \\
BL Cam        & 54896.3796 & 0.0008 & RP   & C    &               & 54942.5858 & 0.0011 & HMB  & V    \\
              & 54896.4187 & 0.0008 & RP   & C    & V337 Ori      & 54837.4619 & 0.0016 & ET   & V    \\
              & 54896.4585 & 0.0008 & RP   & C    &               & 54873.4822 & 0.0020 & RP   & V    \\
              & 54896.4965 & 0.0012 & RP   & C    &               & 54892.4001 & 0.0047 & RP   & C    \\
              & 54896.5360 & 0.0011 & RP   & C    &               & 54893.4088 & 0.0009 & HMB  & V    \\
              & 54896.5753 & 0.0009 & RP   & C    & V1162 Ori     & 51553.3517 & 0.0006 & BHO2 & V    \\
              & 55200.3658 & 0.0015 & RP   & C    &               & 51553.4297 & 0.0008 & BHO2 & V    \\
              & 55200.4054 & 0.0009 & RP   & C    &               & 51568.3020 & 0.0008 & BHO2 & V    \\
              & 55200.4446 & 0.0006 & RP   & C    &               & 51568.3803 & 0.0008 & BHO2 & V    \\
              & 55200.4840 & 0.0007 & RP   & C    &               & 52223.5414 & 0.0007 & BHO2 & V    \\
              & 55200.5232 & 0.0012 & RP   & C    &               & 52228.4989 & 0.0008 & BHO2 & V    \\
              & 55200.5616 & 0.0006 & RP   & C    &               & 52228.5780 & 0.0008 & BHO2 & V    \\
              & 55200.6017 & 0.0008 & RP   & C    &               & 52254.3889 & 0.0008 & BHO2 & V    \\
AD CMi        & 54891.3291 & 0.0007 & HMB  & V    &               & 52254.4652 & 0.0008 & BHO2 & V    \\
              & 54893.4197 & 0.0009 & HMB  & V    &               & 52254.5444 & 0.0007 & BHO2 & V    \\
              & 55180.6865 & 0.0007 & HMB  & V    &               & 52254.6220 & 0.0005 & BHO2 & V    \\
XX Cyg        & 55044.4658 & 0.0007 & HMB  & V    &               & 52257.4561 & 0.0007 & BHO2 & V    \\
LW Dra        & 54922.3613 & 0.0008 & HMB  & V    &               & 52257.5342 & 0.0007 & BHO2 & V    \\
              & 54922.4799 & 0.0007 & HMB  & V    &               & 52257.6124 & 0.0011 & BHO2 & V    \\
              & 54922.5975 & 0.0010 & HMB  & V    &               & 52258.4006 & 0.0009 & BHO2 & V    \\
              & 54946.4652 & 0.0007 & JVW  & V    &               & 52258.4786 & 0.0007 & BHO2 & V    \\
              & 54953.4358 & 0.0009 & JVW  & V    &               & 52258.5582 & 0.0010 & BHO2 & V    \\
              & 54960.4069 & 0.0008 & JVW  & V    &               & 52270.3625 & 0.0009 & BHO2 & V    \\
              & 54960.5249 & 0.0008 & JVW  & V    &               & 52270.4388 & 0.0009 & BHO2 & V    \\
SZ Lyn        & 54912.5263 & 0.0009 & HMB  & V    &               & 52270.5174 & 0.0009 & BHO2 & V    \\
              & 55189.5234 & 0.0008 & HMB  & V    &               & 52277.3647 & 0.0008 & BHO2 & V    \\
              & 55191.4519 & 0.0004 & HMB  & V    &               & 52277.4445 & 0.0008 & BHO2 & V    \\
              & 55191.5722 & 0.0006 & HMB  & V    &               & 52279.3314 & 0.0009 & BHO2 & V    \\
              & 55191.6931 & 0.0005 & HMB  & V    &               & 52279.4101 & 0.0009 & BHO2 & V    \\
AN Lyn        & 54848.4592 & 0.0009 & SK   & V    &               & 52279.4896 & 0.0007 & BHO2 & V    \\
              & 54848.5573 & 0.0008 & SK   & V    &               & 54829.4874 & 0.0008 & BHO2 & V    \\
              & 54848.6570 & 0.0010 & SK   & V    &               & 54829.5674 & 0.0008 & BHO2 & V    \\
              & 54858.3862 & 0.0009 & SK   & V    &               & 54833.4990 & 0.0009 & BHO2 & V    \\
              & 54858.4834 & 0.0008 & SK   & V    &               & 54838.3803 & 0.0007 & BHO2 & V    \\
              & 54858.5838 & 0.0009 & SK   & V    &               & 54838.4570 & 0.0008 & BHO2 & V    \\
              & 54882.6568 & 0.0019 & HMB2 & V    &               & 54838.5365 & 0.0007 & BHO2 & V    \\
              & 54882.7551 & 0.0016 & HMB2 & V    &               & 54841.3694 & 0.0007 & BHO2 & V    \\
              & 54882.8526 & 0.0025 & HMB2 & V    &               & 54841.4495 & 0.0008 & BHO2 & V    \\
              & 54883.6408 & 0.0018 & HMB2 & BV   & DY Peg        & 55069.3734 & 0.0004 & SBL  & V    \\
              & 54883.7388 & 0.0013 & HMB2 & BV   &               & 55069.4458 & 0.0003 & SBL  & V    \\
              & 54887.6704 & 0.0014 & HMB2 & BV   &               & 55069.5190 & 0.0002 & SBL  & V    \\
              & 54887.7674 & 0.0017 & HMB2 & BV   &               & 55069.5923 & 0.0002 & SBL  & V    \\
              & 54889.6375 & 0.0007 & HMB2 & BV   &               & 55113.4203 & 0.0009 & SBL  & V    \\
              & 54889.7342 & 0.0021 & HMB2 & BV   &               & 55113.4933 & 0.0006 & SBL  & V    \\
\hline
\end{tabular}
\normalsize
\end{center}
\end{table}

\setcounter{table}{1}
\begin{table}[!hc]
\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
DY Peg        & 55130.2666 & 0.0003 & SBL  & V    & GSC 2977-0238 & 55244.5580 & 0.0000 & HMB  & VR   \\
              & 55132.3811 & 0.0006 & SBL  & V    &               & 55244.6337 & 0.0000 & HMB  & VR   \\
              & 55143.3929 & 0.0007 & JVW  & V    & GSC 3074-0114 & 54921.4442 & 0.0006 & HO40 & C    \\
              & 55155.3534 & 0.0004 & HMB  & VR   &               & 54921.4953 & 0.0005 & HO40 & C    \\
              & 55155.4266 & 0.0001 & HMB  & VR   &               & 54944.5786 & 0.0007 & HMB  & V    \\
              & 55177.3767 & 0.0007 & JVW  & V    &               & 54944.6299 & 0.0002 & HMB  & V    \\
              & 55180.2940 & 0.0008 & HMB  & VR   &               & 54945.5532 & 0.0006 & HMB  & V    \\
              & 55180.3671 & 0.0006 & HMB  & VR   &               & 54945.6044 & 0.0005 & HMB  & V    \\
              & 55192.2535 & 0.0002 & HMB  & VR   & GSC 3755-0845 & 54841.2752 & 0.0009 & BHO1 & V    \\
              & 55192.3270 & 0.0006 & HMB  & VR   &               & 54862.2796 & 0.0008 & SBL  & V    \\
GW UMa        & 54838.5450 & 0.0009 & MVL  & V    &               & 54862.3559 & 0.0010 & SBL  & V    \\
              & 54877.3546 & 0.0013 & HMB  & V    &               & 54862.4318 & 0.0007 & SBL  & V    \\
              & 54891.3755 & 0.0016 & HMB  & V    &               & 55132.5017 & 0.0014 & SBL  & V    \\
              & 54891.5794 & 0.0019 & HMB  & V    &               & 55132.5772 & 0.0013 & SBL  & V    \\
              & 55198.6049 & 0.0050 & HMB  & V    &               & 55153.3524 & 0.0012 & SBL  & V    \\
              & 55223.3947 & 0.0015 & HMB  & V    &               & 55153.4283 & 0.0010 & SBL  & V    \\
              & 55233.3504 & 0.0017 & HMB  & V    &               & 55153.5046 & 0.0016 & SBL  & V    \\
GSC 2108-1564 & 55047.4141 & 0.0021 & HMB  & V    &               & 55153.5801 & 0.0015 & SBL  & V    \\
              & 55047.5122 & 0.0017 & HMB  & V    & GSC 3832-0152 & 54881.3444 & 0.0007 & HMB  & V    \\
GSC 2566-1398 & 54891.5362 & 0.0005 & HMB  & V    &               & 54910.3909 & 0.0008 & SBL  & V    \\
              & 54911.4928 & 0.0008 & SBL  & V    &               & 54910.4823 & 0.0008 & SBL  & V    \\
              & 54911.5831 & 0.0008 & SBL  & V    &               & 54910.5736 & 0.0007 & SBL  & V    \\
              & 54911.6740 & 0.0007 & SBL  & V    &               & 55233.4679 & 0.0005 & HMB  & V    \\
              & 54912.4904 & 0.0007 & SBL  & V    &               & 55233.5592 & 0.0004 & HMB  & V    \\
              & 54941.4279 & 0.0011 & SBL  & V    & GSC 4556-1113 & 54842.2812 & 0.0006 & HMB  & V    \\
              & 54944.4213 & 0.0006 & SBL  & V    &               & 54843.3171 & 0.0006 & HMB  & V    \\
              & 54944.5120 & 0.0005 & SBL  & V    &               & 54843.4034 & 0.0008 & HMB  & V    \\
              & 54945.4191 & 0.0008 & SBL  & V    &               & 54850.3111 & 0.0009 & HMB  & V    \\
              & 54945.5098 & 0.0007 & SBL  & V    &               & 54850.3971 & 0.0009 & HMB  & V    \\
              & 54946.4169 & 0.0008 & SBL  & V    &               & 54856.3553 & 0.0010 & HMB  & V    \\
              & 54946.5077 & 0.0006 & SBL  & V    &               & 54856.4415 & 0.0008 & HMB  & V    \\
GSC 2815-0790 & 55117.3778 & 0.0024 & RP   & V    &               & 54856.5272 & 0.0008 & HMB  & V    \\
              & 55117.4844 & 0.0018 & RP   & V    &               & 54856.6129 & 0.0008 & HMB  & V    \\
              & 55117.5916 & 0.0015 & RP   & V    &               & 54858.4273 & 0.0007 & HMB  & V    \\
              & 55121.3342 & 0.0018 & RP   & V    &               & 54858.5135 & 0.0008 & HMB  & V    \\
              & 55227.3099 & 0.0012 & RP   & V    &               & 54858.5998 & 0.0009 & HMB  & V    \\
              & 55227.4170 & 0.0013 & RP   & V    &               & 54858.6862 & 0.0008 & HMB  & V    \\
GSC 2977-0238 & 54922.3720 & 0.0002 & HO40 & V    &               & 54860.3263 & 0.0009 & HMB  & V    \\
              & 54922.4481 & 0.0003 & HO40 & V    &               & 54860.4133 & 0.0007 & HMB  & V    \\
              & 54922.5240 & 0.0003 & HO40 & V    &               & 54860.4995 & 0.0008 & HMB  & V    \\
              & 54930.2691 & 0.0007 & SK   & V    &               & 54860.5855 & 0.0010 & HMB  & V    \\
              & 54930.3447 & 0.0010 & SK   & V    &               & 54861.2763 & 0.0007 & HMB  & V    \\
              & 54930.4209 & 0.0008 & SK   & V    &               & 54861.3627 & 0.0007 & HMB  & V    \\
              & 54963.3004 & 0.0008 & SK   & V    &               & 54861.4489 & 0.0009 & HMB  & V    \\
              & 55223.2964 & 0.0008 & HO18 & V    &               & 54861.5354 & 0.0008 & HMB  & V    \\
              & 55223.3725 & 0.0008 & HO18 & V    &               & 54861.6217 & 0.0006 & HMB  & V    \\
              & 55233.3197 & 0.0005 & HMB  & V    & GSC 4923-0693 & 54138.8439 & 0.0003 & HMB2 & C    \\
              & 55233.6236 & 0.0004 & HMB  & V    & GSC 6678-0579 & 54953.5297 & 0.0011 & AO2  & C    \\
              & 55244.3300 & 0.0001 & HMB  & VR   &               & 54953.5991 & 0.0012 & AO2  & C    \\
              & 55244.4060 & 0.0001 & HMB  & VR   & GSC 7027-0700 & 55151.7081 & 0.0004 & AO1  & C    \\
              & 55244.4819 & 0.0001 & HMB  & VR   &               & 55151.7624 & 0.0004 & AO1  & C    \\
\hline
\end{tabular}
\normalsize
\end{center}
\end{table}

\clearpage
\references

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Hintz, E.G., Bush T.C., Rose M.B., 2005, {\it AJ}, {\bf 130}, 2876

H\"ubscher J., 2005, {\it IBVS}, 5643

H\"ubscher J., Paschke A., Walter F., 2005, {\it IBVS}, 5657

H\"ubscher J., Paschke A., Walter F., 2006, {\it IBVS}, 5731

Khruslov A.V., 2008, {\it PZP}, {\bf 8}, 5

Klingenberg G., Dvorak S.W., Robertson C.W., 2006, {\it IBVS}, 5701

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

Pojmanski G., 2002, {\it Acta Astron.}, {\bf 52}, 397 

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}, 5878

Zhou A.-Y., 2002, {\it A\&A}, {\bf 385}, 503

\endreferences

\IBVSCorrectedVersion{Wed Mar 10 08:19:53 Europe/Budapest 2010}

\end{document}
