\documentstyle[twoside,ibvs2,ibvst,ibvse,epsf]{article}

\begin{document}

\IBVShead{5411}{6 May 2003}

\IBVStitle{Five New W UM\lowercase{a} Variables}

\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{TYC 2511-167-1} 
\SIMBADobj{GSC 2511-53} 
\SIMBADobj{GSC 6336-140}
\SIMBADobj{GSC 825-1465}
\SIMBADobj{GSC 229-701} 

\IBVSkey{Photometry}

\IBVSabs{The basic light-curve parameters of five new W UMa variable stars}
\IBVSabs{are reported.}


\begintext

\IBVSEstarlis{
TYC 2511-167-1            & EW & 10\hr 34\mm 12\fsec41 & $+$32\deg 08\arcm 52\farcs0 & * \\
GSC 2511-53               & EW & 10\hr 33\mm 04\fsec91 & $+$32\deg 22\arcm 15\farcs3 & * \\
GSC 6336-140              & EW & 20\hr 18\mm 26\fsec75 & $-$18\deg 58\arcm 19\farcs7 & * \\
GSC 825-1465              & EW & 09\hr 20\mm 59\fsec20 & $+$14\deg 57\arcm 24\farcs8 & * \\
GSC 229-701               & EW & 09\hr 04\mm 17\fsec82 & $+$04\deg 32\arcm 29\farcs8 & * \\}
{\small * R magnitudes of about ten USNO-A2.0 stars in the fields.}

\IBVSTobs{Les Engarouines Observatory (IAU astrometric code A14), 0.212m Newton.}

\IBVSTdet{KAF-1600 CCD.}

\IBVSTfil{None, roughly $R$.}

\IBVSTdata{Upon request}

\IBVSEred{Standard CCD-frame reduction using {\tt Prism}.}

\IBVSTdateobs{
\begin{tabular}{ll}
TYC 2511-167-1            & 2002$-$3$-$9, 13; 2002$-$4$-$6, 17, 18, 19; 2002$-$12$-$3, 7;\\ & 2003$-$4$-$5 \\
GSC 2511-53               & 2002$-$3$-$13; 2002$-$4$-$6, 17; 2002$-$12$-$3, 7;\\ & 2003$-$2$-$2; 2003$-$4$-$5 \\
GSC 6336-140              & 2002$-$8$-$5, 7, 14, 16; 2002$-$9$-$7, 15 \\
GSC 825-1465              & 2003$-$2$-$7, 8, 9; 2003$-$3$-$5 \\
GSC 229-701               & 2003$-$2$-$8; 2003$-$3$-$5, 7, 8
\end{tabular}}

\begin{table}[!ht]
\centerline{\normalsize {\bf Table~1.} Light curve parameters from the data analysis by the {\tt CourbRot} software}
\centerline{\normalsize (Behrend, 2001). Uncertainties correspond to one standard-deviation.}
\begin{center}
\begin{tabular}{|lcccc|}
\hline
Star name & HJD of a pr. min. & Period & Tot. var. & Type \\
\hline
TYC 2511-167-1            & $ 2452366\fday884 $ & $    0\fday4368897$ & $    0\fmm38 $ & W UMa \\
                          & $\pm    0\fday010 $ & $\pm 0\fday0000015$ & $\pm 0\fmm03 $ &  \\
GSC 2511-53               & $ 2452358\fday913 $ & $    0\fday3709787$ & $    0\fmm143$ & W UMa \\
                          & $\pm    0\fday003 $ & $\pm 0\fday0000014$ & $\pm 0\fmm005$ &  \\
GSC 6336-140              & $ 2452508\fday702 $ & $     0\fday39118 $ & $    0\fmm376$ & W UMa \\
                          & $\pm    0\fday002 $ & $\pm  0\fday00002 $ & $\pm 0\fmm009$ &  \\
GSC 825-1465              & $ 2452678\fday248 $ & $     0\fday53461 $ & $    0\fmm394$ & W UMa \\
                          & $\pm    0\fday002 $ & $\pm  0\fday00004 $ & $\pm 0\fmm009$ &  \\
GSC 229-701               & $ 2452678\fday548 $ & $     0\fday30953 $ & $    0\fmm30 $ & W UMa \\
                          & $\pm    0\fday003 $ & $\pm  0\fday00003 $ & $\pm 0\fmm02 $ & \\
\hline
\end{tabular}
\end{center}
\end{table}

\vspace*{-1.5cm}

\IBVSTrem{
The Simbad database reports no known variable stars in the vicinity of these five objects.
Tycho's photometry for TYC 2511-167-1 was downloaded from the CDS web-server. As expected, the uncertainties
for this faint star were too high to usefully constrain the light curve and its period; the general trend is
nevertheless in relative agreement with the parameters we deduced from our observations.
All objects were found to be variable by L.~B., in the course of asteroidal light curve determination.
}

\IBVSTack{
These researches used the Simbad database,
operated by the CDS at Strasbourg, France.
}

\vspace*{1cm}

\IBVSfig{7.0cm}{5411-f1.eps}{Unfiltered light curve of TYC 2511-167-1,
$P=0\fday4368897$. \\ The small labels denote the chronologic order of the series of
observations in Figs.\,1-5.}
%%\IBVSfigKey{5411-f1.eps}{TYC 2511-167-1}{light curve}

\IBVSfig{7cm}{5411-f2.eps}{Unfiltered light curve of GSC 2511-53,
$P=0\fday3709787$.\vspace*{-1cm}}
%%\IBVSfigKey{5411-f2.eps}{GSC 2511-53}{light curve}

\IBVSfig{7cm}{5411-f3.eps}{Unfiltered light curve of GSC 6336-140,
$P=0\fday391178$.\vspace*{-1cm}}
%%\IBVSfigKey{5411-f3.eps}{GSC 6336-140}{light curve}

\IBVSfig{7cm}{5411-f4.eps}{Unfiltered light curve of GSC 825-1465,
$P=0\fday534615$.}
%%\IBVSfigKey{5411-f4.eps}{GSC 825-1465}{light curve}

 %\clearpage

\IBVSfig{7.0cm}{5411-f5.eps}{Unfiltered light curve of GSC 229-701,
$P=0\fday309525$.}
%%\IBVSfigKey{5411-f5.eps}{GCS 229-701}{light curve}


\reference

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

\endreferences


\end{document}
