\documentstyle[twoside,epsf]{article}

\input ibvs2.sty
\input ibvst.sty

\begin{document}

\IBVShead{5234}{4 February 2002}

\IBVStitle{GSC 650\_475 and GSC 650\_769: two new variable stars}

\IBVSauth{Bernasconi, L.$^1$; Behrend, R.$^2$}

\IBVSinst{Les Engarouines Observatory, F-84570 Malemort-du-Comtat, France,
\\email: laurent.bernasconi.51@wanadoo.fr}

\IBVSinst{Geneva Observatory, CH-1290 Sauverny, Switzerland,
email: raoul.behrend@obs.unige.ch}

\SIMBADobj{GSC 650-475}
\SIMBADobj{GSC 650-769}

\begintext

\IBVSTnam{GSC 650\_475}
\IBVSTcoo{03\hr29\mm14\fsec73}{$+09$\deg11\arcm20\farcs4}{J2000}

\IBVSTnam{GSC 650\_769}
\IBVSTcoo{03\hr28\mm25\fsec77}{$+09$\deg04\arcm23\farcs6}{J2000}

\IBVSfig{10.5cm}{5234-f1.eps}{Unfiltered light curve of GSC 650\_475}
\IBVSfig{10.5cm}{5234-f2.eps}{Unfiltered light curve of GSC 650\_769}

\IBVSTobs{Les Engarouines Observatory (IAU astrometric code 164), 0.212m Newton telescope}

\IBVSTdet{KAF 1600 CCD}

\IBVSTfil{None, roughly $R$}

\IBVSTsysn

\IBVSTdata{Upon request}

\IBVSTrem{
GSC~650\_475 was found to be a variable star by Bernasconi on CCD frames
taken around 2001 Dec. 20.0 UT (circles in Figure~1) for
the successful determination of the asteroid (404)~Arsinoe's
lightcurve. The variability of GSC~650\_769
was found analysing the frames obtained during the three next nights
around Dec. 21.0, 21.9 and 22.9 (squares, diamonds and stars in
Figures~1 and~2). The periods of the two objects were refined using
observations at about 2002 Jan. 11.0 (triangles).
The analysis of the observations was done with the {\tt CourbRot}
software (Behrend, 2001), in a manner very similar to the one described 
in Behrend, Buil, Antonini \& Demeautis (2002); the main results are as 
follows: \\ \\
For GSC~650\_475:
\begin{eqnarray*}
    \textrm{HJD of a principal minimum} &=& 2452264.9819 \pm 0.0004 \\
    \textrm{Period} &=& 0\fday44713 \pm 0\fday00007 \\
    \textrm{Total variation} &=& 0.42 \pm 0.01 \,\textrm{mag} \\
    \textrm{Probable type of variability} &=& \textrm{EW/KW}
\end{eqnarray*}
For GSC~650\_769:
\begin{eqnarray*}
    \textrm{HJD of a principal minimum} &=& 2452265.8573 \pm 0.0012 \\
    \textrm{Period} &=& 0\fday29172 \pm 0\fday00010 \\
    \textrm{Total variation} &=& 0.30 \pm 0.01 \,\textrm{mag} \\
    \textrm{Probable type of variability} &=& \textrm{EW}
\end{eqnarray*}
}


\reference

   Behrend, R., 2001, {\it Orion}, {\bf 304}, 12

   Behrend, R., Buil, Ch., Antonini, P., Demeautis, Ch., 2002, {\it IBVS} 5219

\end{document}

