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\input ibvs2.sty
\input ibvst.sty
\input ibvse.sty

\begin{document}

\IBVShead{5337}{13 November 2002}

\IBVStitle{First Light Curve and Elements of AB C\lowercase{nc}}

\IBVSauth{H\'{a}jek, P.$^1$; Koss, K.$^2$; Kudrn\'{a}\v{c}ov\'{a}, J.$^3$; Motl, D.$^4$}

\IBVSinst{Brno Observatory, Krav\'{\i} hora 2, Brno 616 00, Czech Republic; e-mail: phajek@sci.muni.cz}
\IBVSinst{Lu\v{c}n\'{\i} 7, Hodon\'{\i}n 695 01, Czech Republic, e-mail: karel.koss@tiscali.cz}
\IBVSinst{Kam\'{\i}nky 7, Brno 634 00, Czech Republic, e-mail: jkudrnacova@centrum.cz}
\IBVSinst{\v{C}tvrt\v{e} 12, Brno 634 00, Czech Republic, e-mail: dmotl@volny.cz}

\SIMBADobj{AB Cnc}
\IBVStyp{ EA }
\IBVSkey{eclipsing binaries}

\IBVSabs{This paper reports on the determination of the light curve}
\IBVSabs{ elements of the star AB Cnc.}
\IBVSabs{It is an Algol type eclipsing binary with a period of 0.9 day}


\begintext

\IBVSTnam{AB Cnc, GSC 809 338}

\IBVSTcoo{08\hr 37\mm 37\fsec}{+14\deg 35\arcm 55\arcs}{2000.0}

\IBVSTcomp{GSC 809 322}

\IBVSTchk{GSC 809 470 and GSC 809 162}

\IBVSTobs{Vyskov observatory, Czech Republic, RL 300/1200 mm telescope}

\IBVSTdet{CCD camera SBIG ST-7, 382 $\times$ 255 pixels, 19\arcm\ $\times$\ 13\arcm\ FOV}

\IBVSTfil{unfiltered CCD band}

\IBVSTsysn{}

\IBVSTdateobs{from February 2001 to May 2002}

\IBVSEred{Images were processed by MUNIDOS photometry software package. (Hroch, Novak,~1997)}

\IBVSEmethod{The times of minima (see table~1) were derived by means of
Tintagel programme (Gaspani,~1995).}

\IBVSTtyp{ EA }

\IBVSTdata{Upon request}

\IBVSEephem{
AB Cnc & $ 52404.3602 \pm 0.0007$ & $0.872823 \pm 0.000005$ & this paper\\
}

\IBVSEmin{
AB Cnc & 52030.3549 & 0.0009 & sec. & $-$ & -- 0.0006 & K, H \\
       & 52322.3158 & 0.0011 & prim.& $-$ &  0.0010 & M \\
       & 52369.4469 & 0.0018 & prim.& $-$ & -- 0.0004 & K \\
       & 52404.3602 & 0.0007 & prim.& $-$ &  0.0000 & H \\
}

\IBVSEremexp{Observer: H=Hajek, K=Koss, M=Motl}

\IBVSfig{85mm}{5337-f1.eps}{Folded light curve of AB Cnc.}

\IBVSfig{80mm}{5337-f2.eps}{Identification map of AB Cnc (bars), comparison star (No.~1) and
two check stars (No.~2~and~3). The size of the field is 19~$\times$~13~arcminutes, unfiltered CCD band,
20-second exposure.}

\IBVSTrem{
The variability of this star was discovered by O.~Morgenroth (1935) who gave the first designation as AN~203.1935~Cnc. The star is also 
mentioned by Zakirov and Shaidulin (1985) as a~member of Praesepe cluster (NGC~2632).
We present the first photoelectric light curve and elements of the system.
The light curve elements were determined with the help of the Varplot application (Motl,~2001).
Figure~1 displays the folded light curve, magnitudes are instrumental and they are relative
to the comparison star used. The depth of the primary and the secondary minima is about
1\fmm1 and 0\fmm4, respectively.
}

\newpage

\references

Gaspani, A., 1995, {\it 3rd GEOS workshop on variable star data acquisition and processing techniques}, May 13--14, 1995,
S. Pellegrino Terme, Italy

Hroch, F., Novak, R., 1997, {\it MUNIDOS}, {\tt http://www.ian.cz/munipack/}

Morgenroth, O., 1935, {\it Astron.\ Nachr.}, {\bf 256}, 282 

Motl, D., 2001, {\it VarPlot}, {\tt http://www.volny.cz/dmotl/varplot/}

Zakirov, M. M., Shaidullin, R. T., 1985, {\it Byull.\ Abastumanskaya Astrofiz.\ Obs.}, {\bf 58}, 313 
% \BIBCODE {1985AbaOB..58..313Z} 

\endreferences


\end{document} 
