\documentstyle[twoside, epsfig]{article}

\input ibvs2.sty
\input ibvse.sty

\begin{document}
\IBVShead{6018}{19 March 2012}

\IBVStitletl{CCD Minima for Selected Eclipsing Binaries in 2011}

\IBVSauth{Nelson, Robert H.}

\IBVSinsto{1393 Garvin Street, Prince George, BC, Canada, V2M 3Z1 \\
e-mail: {\tt b-o-b.nelson@shaw.ca} [remove
dashes]}

\begintext

\IBVSkey{CCD photometry}

\IBVSEobs{Sylvester Robotic Observatory (SyRO):  33\,cm f/4.5 Newtonian on a Paramount ME}

\IBVSEdet{SyRO: SBIG ST-7XME, 1\farcs25 pixels, 15\farcm8 $\times$ 10\farcm5 FOV, $-$10 $<$ T $<$ $-$30$^{\circ}$C 
SyRO:  SBIG ST-10XME, 6\farcs8 pixels, 34\farcm4 $\times$ 23\farcm2 FOV, $-$10 $<$ T $<$ $-$30$^{\circ}$C}

\IBVSEred{Aperture photometry using MIRA, by Mirametrics. Bias and dark subtraction, flat-fielding using light-box flats;
aperture photometry--all using MIRA, by Mirametrics.  Check stars were
used throughout.
}
\IBVSEmethod{Kwee \& van Woerden (1956)}
\IBVSErem{Digital tracing paper method, bisection of chords, curve fitting, and (occasionally) Kwee and van Woerden (1956)}

\IBVSEmin{
QX And & 55842.742 & 0.002 & I & R (2) 	& \hphantom{$-$}0.00176& \\
V0404 And & 55848.7187 & 0.0003 & I & C (2) 	& \hphantom{$-$}0.00308& \\
V0463 And & 55847.6803 & 0.0002 & II & C (2) 	& \hphantom{$-$}0.00000& \\
G0473-3466 Aql & 55712.8756 & 0.0005 & I & C (1) 	&  \hphantom{$-$}0.00000& \\
G1045-1028 Aql & 55700.92063 & 0.0001 & ! & C (1) 	&  \hphantom{$-$}0.00000& \\
RX Ari & 55850.799 & 0.001 & I & C (2) 	&  $-$0.00221& \\
BN Ari & 55591.6207 & 0.0001 & I & R (1) 	&  $-$0.00057& \\
HL Aur & 55836.903 & 0.0002 & II & C (2) 	&  $-$0.00249& \\
V0567 Aur & 55592.9245 & 0.0003 & II & C (1) 	&  $-$0.00071& \\
G2374-0055 Aur & 55904.6824 & 0.0005 & II & C (2) 	&  \hphantom{$-$}0.00044& \\
G2429-1010 Aur & 55590.8436 & 0.0005 & I & C (1) 	&  \hphantom{$-$}0.00000& \\
G2933-1972 Aur & 55849.8957 & 0.0001 & I & C (2) 	&  $-$0.00013& \\
SY Boo & 55649.828 & 0.002 & I & C (1) 	&  $-$0.00268& (a) \\
TZ Boo & 55927.0427 & 0.0002 & I & R (2) 	&  $-$0.00187& \\
DN Boo & 55644.8241 & 0.0005 & II & R (1) 	&  $-$0.00034& \\
LR Cam & 55840.9676 & 0.0002 & II & R (2) 	&  $-$0.00032& \\
NQ Cam & 55847.9862 & 0.0002 & II & C (2) 	&  \hphantom{$-$}0.00235& \\
NR Cam & 55926.75994 & 0.0002 & I & C (2) 	&  $-$0.00006& \\
G4327-2766 Cam & 55847.779 & 0.001 & I & C (2) 	&  \hphantom{$-$}0.00000& \\
G4550-1548 Cam & 55589.9006 & 0.0003 & I & C (1) 	&  \hphantom{$-$}0.00000& \\
BS Cas & 55840.7898 & 0.0002 & I & R (2) 	&  \hphantom{$-$}0.00078& \\
CW Cas & 55840.7047 & 0.0001 & I & C (2) 	&  $-$0.00073& \\
V0520 Cas & 55798.7911 & 0.0001 & II & C (1) 	&  \hphantom{$-$}0.00194& \\
V0537 Cas & 55838.7445 & 0.0002 & I & R (1) 	&  $-$0.00017& \\
V1060 Cas & 55791.7579 & 0.0005 & II & R (1) 	&  $-$0.00010& \\
V0736 Cep & 55705.882 & 0.001 & I & R (1) 	&  \hphantom{$-$}0.00000& \\
G4267-0682 Cep & 55835.6839 & 0.0003 & II & R (2) 	&  $-$0.00067& \\
G4481-0080 Cep & 55855.6247 & 0.0005 & II & C (2) 	&  \hphantom{$-$}0.00000& \\
G4484-1192 Cep & 55839.6983 & 0.0002 & II & C (2) 	&  \hphantom{$-$}0.00000& \\
BB CMi & 55916.862 & 0.001 & II & C (2) 	&  $-$0.00004& \\
HN CnC & 55592.764 & 0.0002 & I & C (1) 	&  \hphantom{$-$}0.00345& \\
IU CnC & 55909.937 & 0.0002 & I & C (2) 	&  $-$0.00056& \\
LP Com & 55646.7451 & 0.0003 & I & C (1) 	&  \hphantom{$-$}0.00277& \\
UX CVn & 55627.824 & 0.001 & II & C (1) 	&  \hphantom{$-$}0.00193& \\
BI CVn & 55593.9265 & 0.0001 & II & C (1) 	&  \hphantom{$-$}0.00027& \\
DE CVn & 55643.7487 & 0.005 & I & C (1) 	& $-$0.02497 &(b) \\
DL CVn & 55653.742 & 0.0003 & II & C (1) 	&  $-$0.00061& \\
DQ CVn & 55638.7056 & 0.0003 & I & C (1) 	&  \hphantom{$-$}0.00013& \\
DX CVn & 55571.9634 & 0.0003 & II & R (1) 	&  $-$0.00105& \\
G2544-1007 CVn & 55629.9079 & 0.0003 & I & C (1) 	&  $-$0.00271& \\
G2704-1999 Cyg & 55714.883 & 0.001 & I & R (1) 	&  \hphantom{$-$}0.00000& \\
G2711-0645 Cyg & 55710.89 & 0.001 & II & C (1) 	&  \hphantom{$-$}0.00000& \\
G3581-1856 Cyg & 55701.8501 & 0.0002 & ! & R (1) 	&  \hphantom{$-$}0.00000& \\
V2477 Cyg & 55739.8398 & 0.0002 & I & R (1) 	&  $-$0.00169& \\
FU Dra & 55626.8412 & 0.0002 & I & C (1) 	&  \hphantom{$-$}0.00029& \\
FU Dra & 55626.9956 & 0.0002 & II & C (1) 	&  \hphantom{$-$}0.00133& \\
G4401-1126 Dra & 55638.8295 & 0.0001 & I & C (1) 	&  \hphantom{$-$}0.00000& \\
G4420-1984 Dra & 55591.9798 & 0.0002 & I & C (1) 	&  $-$0.00002& \\
}

\IBVSEmin{
G4421-1217 Dra & 55652.9379 & 0.0002 & II & C (1) 	&  \hphantom{$-$}0.00000& \\
G4421-1708 Dra & 55685.802 & 0.002 & I & C (1) 	&  \hphantom{$-$}0.00000& (a)\\
G4439-1124 Dra & 55659.9328 & 0.0003 & II & C (1) 	&  \hphantom{$-$}0.00000& \\
G4449-0995 Dra & 55682.9286 & 0.0002 & II & R (1) 	&  \hphantom{$-$}0.00000& (c)  \\
G4449-0995 Dra & 55720.8416 & 0.0003 & I & R (1) 	&  \hphantom{$-$}0.00000& \\
QW Gem & 55907.7418 & 0.0003 & I & C (2) 	&  $-$0.00412& \\
V0367 Gem & 55835.9778 & 0.0002 & I & C (2) 	&  $-$0.00046& \\
G1335-1812 Gem & 55592.657 & 0.002 & I & C (1) 	&  \hphantom{$-$}0.00000& \\
G1338-1984 Gem & 55842.9759 & 0.0003 & II & C (2) 	&  \hphantom{$-$}0.00136& \\
G1883-1299 Gem & 55833.013 & 0.003 & II & R (2) 	&  \hphantom{$-$}0.00000& \\
G1913-1513 Gem & 55591.7373 & 0.0002 & II & R (1) 	&  \hphantom{$-$}0.00000& \\
V0728 Her & 55695.8169 & 0.0003 & II & R (1) 	&  $-$0.00155& \\
V0829 Her & 55658.9126 & 0.0002 & II & R (1) 	&  \hphantom{$-$}0.00097& \\
V1045 Her & 55648.8726 & 0.0003 & II & C (1) 	&  $-$0.00001& (d)\\
V1071 Her & 55590.0483 & 0.0003 & I & C (1) 	&  \hphantom{$-$}0.00077& \\
V1094 Her & 55658.8186 & 0.0005 & I & C (1) 	&  $-$0.00533& \\
V1100 Her & 55653.8851 & 0.0001 & I & C (1) 	&  \hphantom{$-$}0.00116& \\
V1101 Her & 55643.9919 & 0.0001 & I & C (1) 	&  \hphantom{$-$}0.00166& \\
G2056-0117 Her & 55643.8867 & 0.0001 & I & C (1) 	&  $-$0.00061& \\
G3532-0553 Her & 55638.9668 & 0.0003 & II & C (1) 	&  $-$0.00094& \\
PP Lac & 55711.9101 & 0.0005 & I & C (1) 	&  \hphantom{$-$}0.00143& \\
CE Leo & 55917.0097 & 0.0001 & II & C (2) 	&  $-$0.00050& \\
XX LMi & 55589.7767 & 0.0005 & I & C (1) 	&  \hphantom{$-$}0.00000& \\
G2515-0839 LMi & 55902.9052 & 0.0001 & I & C (2) 	&  \hphantom{$-$}0.00000& \\
UU Lyn & 55851.0346 & 0.0004 & I & C (2) 	&  \hphantom{$-$}0.00231& \\
G0140-0964 Mon & 55907.8323 & 0.0003 & II & C (2) 	&  \hphantom{$-$}0.00000& \\
G0170-1717 Mon & 55593.7021 & 0.0003 & II & C (1) 	&  \hphantom{$-$}0.00000& \\
G1322-0294 Ori & 55902.785 & 0.0001 & II & C (2) 	&  $-$0.00001& \\
G1721-1141 Peg & 55850.6855 & 0.0002 & I & C (2) 	&  \hphantom{$-$}0.00000& \\
V0578 Per & 55798.9632 & 0.0009 & I & R (1) 	&  \hphantom{$-$}0.00011& \\
G2385-0341 Per & 55571.6004 & 0.0001 & I & R (1) 	&  \hphantom{$-$}0.00001& \\
G0613-1099 Psc & 55902.6186 & 0.0002 & I & C (2) 	&  \hphantom{$-$}0.00000& \\
V0366 Sge & 55721.872 & 0.001 & I & C (1) 	&  \hphantom{$-$}0.00000& \\
CR Tau & 55893.8458 & 0.0002 & I & C (2) 	&  \hphantom{$-$}0.00236& \\
EQ Tau & 55901.675 & 0.002 & I & C (2) 	&  $-$0.00119& \\
V0781 Tau & 55591.8441 & 0.0002 & I & V (1) 	&  \hphantom{$-$}0.00492& \\
G1305-1430 Tau & 55842.85 & 0.0002 & II & C (2) 	&  \hphantom{$-$}0.00000& \\
TY UMa & 55916.0343 & 0.0001 & I & C (2) 	&  $-$0.00228& \\
HH UMa & 55907.97429 & 0.0003 & II & C (2) 	&  \hphantom{$-$}0.00472& \\
KM UMa & 55659.75 & 0.01 & II & R (1) 	&  \hphantom{$-$}0.01664& \\
MT UMa & 55926.9201 & 0.0003 & II & C (2) 	&  $-$0.00015& \\
G4375-0620 UMa & 55628.7491 & 0.0005 & I & C (1) 	&  $-$0.00010& \\
VY UMi & 55682.8051 & 0.0002 & I & R (1) 	&  \hphantom{$-$}0.03398& \\
G4408-0436 UMi & 55654.79 & 0.003 & II & C (1) 	& \hphantom{$-$}0.00000  & (e)\\
G2166-0041 Vul & 55702.848 & 0.001 & II & C (1) 	&  \hphantom{$-$}0.00000& \\
}

\IBVSErem{Star name: G denotes GSC\\
(a) Rough minimum\\
(b) Strange LC with transit (possibly planet?), see Fig. 1. \\
(c) New variable\\
(d) Period is very constant\\
(e) Strange LC. Pair includes pulsating component? (See Fig. 2.)\\
(1) ST-7XE \hskip 1cm (2) ST-10XE \\
}

Note: $O-C$ values were calculated using elements from the $O-C$
database mentioned in the references. 

\IBVSfig{16cm}{6018-f1.eps}{Upper panel: light curve of DE CVn during eclipse. A 0\fmm07 deep transit is visible at around JD 2455643.77. 
Lower panel: comparison minus check light curve.}
\IBVSfigKey{6018-f1.eps}{DE CVn}{LC fit}
\newpage
\IBVSfig{8cm}{6018-f2.eps}{Light curve of G4408-0436 UMi
during transit. The data suggest pulsating component.}
\IBVSfigKey{6018-f2.eps}{G4408-0436 UMi}{LC fit}


\IBVSEack{Thanks are due to Environment Canada for the website satellite views (see reference below) that were essential in predicting clear times for observing runs in this cloudy locale.  Thanks are also due to Attilla Danko for his ``Clear Sky Charts'', (see below).  
This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.}


\references

Danko, A., Clear Sky Charts, {\tt http://cleardarksky.com/ }

Kwee, K.K., \& van Woerden, H., 1956, B.A.N. 12, (464), 327

Nelson, R.H., Bob Nelson's O-C Files, \\
{\tt http://www.aavso.org/bob-nelsons-o-c-files }

Satellite Images for North America, \\
{\tt http://www.weatheroffice.gc.ca/satellite/index\_e.html }

\endreferences

\IBVSedata{6018-t1.txt}
\IBVSdataKey{6018-t1.txt}{}{minima/maxima times}

\end{document}


