\documentstyle[twoside,epsf]{article}

\input ibvs2.sty

\input ibvst.sty

\begin{document}

\IBVShead{5042}{9 March 2001}

\IBVStitle{UBVR Photometry of Contact Binary XY Leonis}

\IBVSauth{Yakut, K.; \.{I}bano\v{g}lu, C.}

\IBVSinsto{Ege University Observatory, 35100 Bornova, Izmir,
Turkey \\ \indent email: yakut@astronomy.sci.ege.edu.tr, ibanoglu@astronomy.sci.ege.edu.tr}

\SIMBADobj{XY Leo}

\begintext

\IBVSTnam{XY Leo = BD\,+18\deg2307 = HIP 49136}

\IBVSTcoo{10\hr 01\mm 40\fsec39}{17\deg 24\farcm5}{2000}

\IBVSTobs{Ege University Observatory, 48-cm Cassegrain telescope}

\IBVSTdet{Hamamatsu, R4457 (PMT)}

\IBVSTfil{$U$, $B$, $V$ and $R$ filters of Johnson $UBV$ system}

\IBVSTcomp{BD\,+18\deg2306 = SAO 98898}

\IBVSTsys{Johnson $UBV$}{}

\IBVSTdata{Upon request}

\IBVSTtyp{ WUMa }

\IBVSTrem{In this paper we present $UBVR$ light curves of the contact
binary XY Leo. We observed XY Leo on the nights of 5, 6 and 24 December
2000 using the 48-cm Casse\-grain telescope of Ege University Observatory.
The phases of the observations were calculated using the
following light elements:
$${\rm HJD~Min.\,I} = 2451884.4470+0\fday28410340 \times E.$$
Table 1 lists the dates of observations and the phases covered.
The $B$, $V$ and $R$ light curves of XY Leo obtained on Dec. 5 and 6 are shown in Figure~1, and $U$, $B$, $V$ and 
$R$ light curves obtained on Dec.~24 are shown in Figure~2.}

\IBVSTack{This work was supported by Ege University Research Fund
(Project No.\ 99/FEN/ 016).}

\bigskip

\begin{center}
{\normalsize Table 1}
\vskip2mm
\begin{tabular}{ll}
\hline Date & Phase\\
\hline 05 Dec. & 0.17--0.71\\
06 Dec. & 0.61--1.18\\
24 Dec. & 0.60--1.63\\
\hline
\end{tabular}
\end{center}

\bigskip

\IBVS2fig{7.5cm}{5042-f1.ps}{The light curves of XY Leo obtained on Dec.~5 and 6, 2000}{5042-f2.ps}{The light curves of XY Leo obtained
on Dec.~24, 2000}

\end{document}
