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\begin{document}

\IBVShead{4751}{16 August 1999}

\IBVStitle{Photoelectric Minima of Some Eclipsing Systems}

\IBVSauth{T.~PRIBULLA, D.~CHOCHOL, \v{S}.~PARIMUCHA}
 
\IBVSinsto{Astronomical Institute of the Slovak Academy of Sciences, SK 059 60 Tatransk\'a Lomnica, Slovakia}


\IBVStyp{ * } 
\IBVSkey{photometry}

\begintext

We present 61 new minima times of 10 RS CVn and W UMa systems taken from August 1997 to July 1999 as a part of the program of the full light-curve coverages.

The $U$, $B$, $V$ and $R$ photoelectric observations were taken at the Skalnat\'e Pleso (SP) and Star\'a Lesn\'a (SL) observatories of the Astronomical Institute of the Slovak Academy of Sciences. In both cases the 0.6-m Cassegrain telescope equipped with a single-channel pulse-counting photoelectric photometer was used. For all observations a 10 second integration was used. Data reduction, the atmospheric extinction correction and transformation to the standard system were carried out in the usual way. 

We have calculated the times of minima separately fo all filters using the Kwee and Van Woerden's method, parabola fit, sliding integration method, tracing paper and ``center of mass'' method which were described in detail by Ghedini (1982). The computer codes were kindly provided by Dr.\ R. Kom\v{z}\'{\i}k (1999). The average times of the primary (I) and secondary (II) minima and their probable errors found by these methods are given in Table~1. 


\begin{center}
\normalsize
Table 1: Times of minima of observed systems
\smallskip

\begin{tabular}{lllccc}
\hline
\raise-4.5pt\hbox{System} & HJD & \multicolumn{1}{c}{\raise-4.5pt\hbox{$\sigma$}} & Min. &  \raise-4.5pt\hbox{Filter} & \raise-4.5pt\hbox{Obs.} \\[-4.5pt]
 & 2400000+ & & type & & \\
\hline
RT And & 50682.4317 & 0.0002 & II & B & SP \\
 & 50682.4319 & 0.0003 & II & V & SP \\
 & 50682.4321 & 0.0002 & II & R & SP \\
 & 50708.53357 & 0.00010 & I & U & SL \\
 & 50708.53319 & 0.00006 & I & B & SL \\
 & 50708.53328 & 0.00009 & I & V & SL \\
 & 50709.4757 & 0.0016 & II & U & SL \\
 & 50709.47792 & 0.00012 & II & B & SL \\
 & 50709.4781 & 0.0002 & II & V & SL \\
 & 51041.5495 & 0.0024 & II & B & SP \\
 & 51041.5499 & 0.0003 & II & V & SP \\
 & 51041.5494 & 0.0002 & II & R & SP \\
 & 51066.3935 & 0.0001 & I & U & SL \\
 & 51066.3943 & 0.0002 & I & B & SL \\
 & 51066.3944 & 0.0002 & I & V & SL \\
 & 51142.49384 & 0.00009 & I & B & SP \\
 & 51142.49359 & 0.00003 & I & V & SP \\
 & 51142.49379 & 0.00004 & I & R & SP \\
 & 51150.35510 & 0.00012 & II & V & SP \\
 & 51150.35522 & 0.00009 & II & R & SP \\
 & 51160.4160 & 0.0001 & II & B & SL \\
 & 51160.4164 & 0.0004 & II & V & SL \\
\hline
\end{tabular}
\end{center}

\newpage

\begin{center}
\normalsize
Table 1 (cont.)
\smallskip

\begin{tabular}{lllccc}
\hline
\raise-4.5pt\hbox{System} & HJD & \multicolumn{1}{c}{\raise-4.5pt\hbox{$\sigma$}} & Min. & \raise-4.5pt\hbox{Filter} & \raise-4.5pt\hbox{Obs.} \\[-4.5pt]
 & 2400000+ & & type & & \\
\hline
44i Boo & 50902.3649 & 0.0004 & I & U & SL \\
 & 50902.3664 & 0.0007 & I & B & SL \\
 & 50902.3665 & 0.0002 & I & V & SL \\
 & 50902.4994 & 0.0010 & II & U & SL \\
 & 50902.5037 & 0.0002 & II & B & SL \\
 & 50902.5029 & 0.0007 & II & V & SL \\
 & 50926.3413 & 0.0005 & II & U & SP \\
 & 50926.3407 & 0.0002 & II & B & SP \\
 & 50926.3402 & 0.0005 & II & V & SP \\
 & 50926.3420 & 0.0003 & II & R & SP \\
 & 50937.4540 & 0.0001 & I & U & SL \\
 & 50937.4548 & 0.0001 & I & B & SL \\
 & 50937.4569 & 0.0003 & I & V & SL \\
 & 50939.4627 & 0.0007 & II & U & SL \\
 & 50939.4626 & 0.0005 & II & B & SL \\
 & 50939.4628 & 0.0007 & II & V & SL \\
 & 50945.3570 & 0.0002 & II & V & SL \\
 & 50945.49039 & 0.00005 & I & V & SL \\
 & 51017.3936 & 0.0007 & II & U & SL \\
 & 51017.3954 & 0.0004 & II & B & SL \\
 & 51017.3969 & 0.0005 & II & V & SL \\
 & 51256.4271 & 0.0001 & I & B & SP \\
 & 51256.4295 & 0.0002 & I & V & SP \\
 & 51256.4286 & 0.0002 & I & R & SP \\
 & 51256.5635 & 0.0003 & II & B & SP \\
 & 51256.5626 & 0.0003 & II & V & SP \\
 & 51256.5627 & 0.0002 & II & R & SP \\
SV Cam & 50839.51107 & 0.00011 & I & U & SL \\
 & 50839.51065 & 0.00017 & I & B & SL \\
 & 50839.51054 & 0.00008 & I & V & SL \\
 & 50849.3004 & 0.0008 & II & U & SL \\
 & 50849.3002 & 0.0003 & II & B & SL \\
 & 50849.2992 & 0.0002 & II & V & SL \\
 & 50849.59314 & 0.00014 & I & U & SL \\
 & 50849.59299 & 0.00006 & I & B & SL \\
 & 50489.59289 & 0.00006 & I & V & SL \\
 & 51158.2894 & 0.0005 & II & V & SP \\
 & 51158.2919 & 0.0003 & II & R & SP \\
 & 51160.36419 & 0.00006 & I & B & SP \\
 & 51160.36412 & 0.00010 & I & V & SP \\
 & 51160.36408 & 0.00007 & I & R & SP \\
 & 51166.29450 & 0.00028 & I & B & SP \\
 & 51166.29441 & 0.00014 & I & V & SP \\
 & 51166.29418 & 0.00008 & I & R & SP \\
 & 51166.5977 & 0.0008 & II & B & SP \\
 & 51166.5939 & 0.0002 & II & V & SP \\
 & 51166.5963 & 0.0008 & II & R & SP \\
 & 51179.34403 & 0.00015 & I & B & SP \\
 & 51179.34337 & 0.00022 & I & V & SP \\
 & 51179.34303 & 0.00013 & I & R & SP \\
EG Cep & 51131.3400 & 0.0002 & I & B & SP \\
 & 51131.3411 & 0.0002 & I & V & SP \\
 & 51131.3416 & 0.0003 & I & R & SP \\
VW Cep & 51067.4198 & 0.0002 & II & U & SL \\
 & 51067.4196 & 0.0002 & II & B & SL \\
\hline
\end{tabular}
\end{center}

\newpage

\begin{center}
\normalsize
Table 1 (cont.)
\smallskip

\begin{tabular}{lllccc}
\hline
\raise-4.5pt\hbox{System} & HJD & \multicolumn{1}{c}{\raise-4.5pt\hbox{$\sigma$}} & Min. & \raise-4.5pt\hbox{Filter} & \raise-4.5pt\hbox{Obs.} \\[-4.5pt]
 & 2400000+ & & type & & \\
\hline
VW Cep & 51067.4202 & 0.0002 & II & V & SL \\
 & 51067.5593 & 0.0005 & I & U & SL \\
 & 51067.5597 & 0.0006 & I & B & SL \\
 & 51067.5609 & 0.0001 & I & V & SL \\
 & 51150.3595 & 0.0005 & II & U & SL \\
 & 51150.35993 & 0.00005 & II & B & SL \\
 & 51150.3609 & 0.0003 & II & V & SL \\
 & 51151.33309 & 0.00009 & I & U & SL \\
 & 51151.33378 & 0.00009 & I & B & SL \\
 & 51151.33240 & 0.00014 & I & V & SL \\
 & 51378.43746 & 0.00018 & I & U & SL \\
 & 51378.43798 & 0.00016 & I & B & SL \\
 & 51378.43771 & 0.00023 & I & V & SL \\
WY Cnc & 51150.57409 & 0.00018 & I & U & SL \\
 & 51150.57324 & 0.00003 & I & B & SL \\
 & 51150.57297 & 0.00008 & I & V & SL \\
AW UMa & 50927.4228 & 0.0005 & II & U & SL \\
 & 50927.4226 & 0.0003 & II & B & SL \\
 & 50927.4223 & 0.0003 & II & V & SL \\
 & 51142.61804 & 0.00012 & I & U & SP \\
 & 51142.61777 & 0.00026 & I & B & SP \\
 & 51142.61698 & 0.00012 & I & V & SP \\
 & 51142.61668 & 0.00008 & I & R & SP \\
W UMa & 50855.34850 & 0.00003 & I & U & SL \\
 & 50855.34763 & 0.00028 & I & B & SL \\
 & 50855.34804 & 0.00008 & I & V & SL \\
 & 50863.35545 & 0.00007 & I & U & SL \\
 & 50863.35554 & 0.00003 & I & B & SL \\
 & 50863.35553 & 0.00002 & I & V & SL \\
 & 50863.52428 & 0.00031 & II & U & SL \\
 & 50863.52392 & 0.00009 & II & B & SL \\
 & 50863.52311 & 0.00013 & II & V & SL \\
 & 50872.36282 & 0.00015 & I & U & SP \\
 & 50872.36285 & 0.00006 & I & B & SP \\
 & 50872.36285 & 0.00013 & I & V & SP \\
 & 50872.36292 & 0.00006 & I & R & SP \\
 & 50890.38050 & 0.00007 & I & U & SL \\
 & 50890.37998 & 0.00006 & I & B & SL \\
 & 50890.38010 & 0.00001 & I & V & SL \\
 & 51137.6050 & 0.0002 & I & U & SL \\
 & 51137.6038 & 0.0002 & I & B & SL \\
 & 51137.6045 & 0.0003 & I & V & SL \\
 & 51150.44867 & 0.00003 & II & B & SL \\
 & 51150.44866 & 0.00002 & II & V & SL \\
XY UMa & 51130.63588 & 0.00009 & I & U & SL \\
 & 51130.63560 & 0.00006 & I & B & SL \\
 & 51130.63569 & 0.00008 & I & V & SL \\
 & 51141.65151 & 0.00004 & I & B & SP \\
 & 51141.65114 & 0.00006 & I & V & SP \\
 & 51141.65141 & 0.00004 & I & R & SP \\
 & 51150.5089 & 0.0006 & II & B & SP \\
 & 51150.5072 & 0.0010 & II & V & SP \\
 & 51150.5100 & 0.0005 & II & R & SP \\
 & 51158.41620 & 0.00004 & I & B & SP \\
 & 51158.41647 & 0.00004 & I & V & SP \\
\hline
\end{tabular}
\end{center}

\newpage

\begin{center}
\normalsize
Table 1 (cont.)
\smallskip

\begin{tabular}{lllccc}
\hline
\raise-4.5pt\hbox{System} & HJD & \multicolumn{1}{c}{\raise-4.5pt\hbox{$\sigma$}} & Min. & \raise-4.5pt\hbox{Filter} & \raise-4.5pt\hbox{Obs.} \\[-4.5pt]
 & 2400000+ & & type & & \\
\hline
XY UMa & 51158.41654 & 0.00005 & I & R & SP \\
 & 51158.6505 & 0.0012 & II & B & SP \\
 & 51158.6523 & 0.0010 & II & V & SP \\
 & 51158.6546 & 0.0002 & II & R & SP \\
 & 51177.57551 & 0.00003 & I & B & SP \\
 & 51177.57570 & 0.00008 & I & V & SP \\
 & 51177.57579 & 0.00008 & I & R & SP \\
 & 51183.32611 & 0.00015 & I & B & SP \\
 & 51183.32460 & 0.00012 & I & V & SP \\
 & 51183.32435 & 0.00022 & I & R & SP \\
 & 51200.5682 & 0.0003 & I & U & SL \\
 & 51200.56779 & 0.00013 & I & B & SL \\
 & 51200.56777 & 0.00005 & I & V & SL \\
 & 51203.44184 & 0.00003 & I & U & SL \\
 & 51203.44187 & 0.00006 & I & B & SL \\
 & 51203.44206 & 0.00003 & I & V & SL \\
 & 51237.4496 & 0.0001 & I & B & SP \\
 & 51237.4508 & 0.0003 & I & V & SP \\
 & 51250.38380 & 0.00005 & I & B & SP \\
 & 51250.38368 & 0.00008 & I & V & SP \\
 & 51250.38325 & 0.00009 & I & R & SP \\
 & 51256.3719 & 0.0003 & II & V & SP \\
 & 51256.3734 & 0.0004 & II & R & SP \\
 & 51273.3757 & 0.0010 & I & U & SL \\
 & 51273.37539 & 0.00023 & I & B & SL \\
 & 51273.37538 & 0.00016 & I & V & SL \\
 & 51274.33421 & 0.00026 & I & U & SL \\
 & 51274.33334 & 0.00028 & I & B & SL \\
 & 51274.33357 & 0.00025 & I & V & SL \\
 & 51278.4121 & 0.0009 & II & U & SL \\
 & 51278.4104 & 0.0009 & II & B & SL \\
 & 51278.4118 & 0.0020 & II & V & SL \\
ER Vul & 51032.3975 & 0.0002 & II & U & SL \\
 & 51032.4003 & 0.0004 & II & B & SL \\
 & 51032.39722 & 0.00008 & II & V & SL \\
 & 51034.4925 & 0.0004 & II & U & SL \\
 & 51034.4923 & 0.0002 & II & B & SL \\
 & 51034.4921 & 0.0003 & II & V & SL \\
 & 51041.4737 & 0.0004 & II & U & SL \\
 & 51041.4726 & 0.0001 & II & B & SL \\
 & 51041.4739 & 0.0002 & II & V & SL \\
\hline
\end{tabular}
\end{center}

\vfil

Acknowledgements. This work was financially supported by the VEGA grant 5038/98.

\references

Kom\v{z}\'{\i}k, R., 1999, {\it private communication}

Ghedini, S., 1982, {\it Software for Photometric Astronomy}, Willmann-Bell Publ.\ Comp., Richmond

\end{document}

