\documentstyle[twoside,epsf]{article}

\input ibvs2.sty
\input ibvst.sty

\begin{document}

\IBVShead{4885}{25 April 2000}

\IBVStitle{The New EB System GSC 4741\_1263}

\IBVSauth{Garrigos-Sanchez, Antonio$^1$; Gomez-Forrellad, Josep M.$^{1,2}$;\\ \indent Garcia-Melendo, Enrique$^2$; Vidal-Sainz, Joaquin$^1$; Juan-Samso, Jordi$^1$}

\IBVSinst{Grup d'Estudis Astronomics, Apdo.\ 9481, 08080 Barcelona, Spain,
e-mail: jmgomez@astrogea.org}

\IBVSinst{Esteve Duran Observatory Foundation, Montseny 46 -- Urb.\ El Montanya,
08553 Seva, Barcelona, Spain,\\ \indent e-mail: duranobs@astrogea.org}

\SIMBADobjAlias{GSC 4741-1263}{TYC 4741 1263 1}

\begintext

\IBVSTnam{GSC 4741\_1263}

\IBVSTcoo{04\hr 53\mm 22\sec}{$-03$\deg 22\arcm 55\arcs}{2000.0}

\IBVSTobs{L'Ametlla del Valles Observatory,
0.5-m Newtonian telescope;\\
Mollet del Valles Observatory,
0.4-m Newtonian telescope;\\
Esteve Duran Observatory,
0.6-m Cassegrain telescope;\\
Monegrillo Observatory,
0.4-m Newtonian telescope;\\
Hostalets de Pierola,
0.4-m Newtonian telescope}

\IBVSTdet{CCD}

\IBVSTfil{$V$}

\IBVSTcomp{GSC 4741\_1265}

\IBVSTchk{None}

\IBVSTsysn

\IBVSTdata{Upon request}

\IBVSTtyp{ EB }

\IBVSfig{9cm}{4885-f1.eps}{Phase curve of the EB type star GSC 4741\_1263}

\IBVSTrem{
Its variability was discovered with the 0.4-m Newtonian telescope at
Mollet del Valles Observatory, and observed for 28 nights from November
1996 to February 1998. This star is included in the Tycho Catalogue
with a derived Johnson $V$ magnitude of 11.48 and a $B-V$ color index
of +0.335. Observations show that GSC 4741\_1263 is a $\beta$ Lyrae
type eclipsing binary system with a period of 0.6140 days, a $V$
amplitude of $0.394\pm0.015$ for primary minimum and $0.252\pm0.015$
for secondary minimum (Figure~1). The phase curve shows an O'Connell
effect of 0\fmm068 where the maximum around phase 0.75 is the
dimmer. Also the secondary minimum is not centered at phase 0.5 but
appears around phase 0.52, and although both minima look flat, the
secondary one is broader.  These two light curve features suggest that
the orbit of the components might be eccentric.\\
The following ephemeris was computed for this star:
\belowdisplayskip-12pt
$$\begin{array}{r@{}r@{}l}
{\rm Min.~I = HJD}~ 2450775.50510 & {} + 0\fday614068 & {} \times E. \\
\pm 0.00065 & \pm 0.000010 \\
\end{array}$$
}

\reference

ESA, 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200

\end{document}
