\documentstyle[twoside,epsf]{article}

\input ibvs2.sty 
\input ibvst.sty 

\begin{document}

\IBVShead{5146}{26 July 2001}

\IBVStitletl{CCD Light Curves of ROTSE1 Variables, XI: GSC 2066:1210 H\lowercase{er},}{ GSC 2063:902 H\lowercase{er}, GSC 2594:1289 H\lowercase{er} and GSC 1522:599 H\lowercase{er}}

\IBVSauth{Bl\"attler, E.$^1$; Diethelm, R.$^2$}

\IBVSinst{BBSAG, Sch\"usselacher 1, CH-8636 Wald, Switzerland; e-mail: blaettler-wald@bluewin.ch}

\IBVSinst{BBSAG, Rennweg 1, CH-4118 Rodersdorf, Switzerland; e-mail: diethelm@astro.unibas.ch}

\SIMBADobj{GSC 2066-1210}
\SIMBADobj{GSC 2063-902}
\SIMBADobj{GSC 2594-1289}
\SIMBADobj{GSC 1522-599}

\begintext

{\bf VAR 1:}
\smallskip
\hrule

\IBVSTnam{GSC 2066:1210 = ROTSE1 J165039.99+274421.1}

\IBVSTcoo{16\hr 50\mm 40\fsec0}{+27\deg 44\arcm 21\arcs}{2000.0}

\IBVSTcomp{GSC 2066:1252}

\IBVSTchk{GSC 2066:1390}

{\bf VAR 2:}
\smallskip
\hrule

\IBVSTnam{GSC 2063:902 = ROTSE1 J165551.74+245335.9}

\IBVSTcoo{16\hr 55\mm 51\fsec7}{+24\deg 53\arcm 36\arcs}{2000.0}

\IBVSTcomp{GSC 2063:1158}

\IBVSTchk{GSC 2063:992}

{\bf VAR 3:}
\smallskip
\hrule

\IBVSTnam{GSC 2594:1289 = ROTSE1 J165819.76+334022.8}

\IBVSTcoo{16\hr 58\mm 19\fsec8}{+33\deg 40\arcm 23\arcs}{2000.0}

\IBVSTcomp{GSC 2598:1627}

\IBVSTchk{GSC 2594:1266}

\newpage

\IBVS2fig{7.5cm}{5146-f1.eps}{CCD light curve (without filter) of GSC 2066:1210}{5146-f2.eps}{CCD light curve (without filter) of GSC
2063:902}

\IBVS2fig{7.5cm}{5146-f3.eps}{CCD light curve (without filter) of GSC 2594:1289}{5146-f4.eps}{CCD light curve (without filter) of GSC
1522:599}

{\bf VAR 4:}
\smallskip
\hrule

\IBVSTnam{GSC 1522:599 = ROTSE1 J165924.08+151220.7}

\IBVSTcoo{16\hr 59\mm 24\fsec1}{+15\deg 12\arcm 21\arcs}{2000.0}

\IBVSTcomp{GSC  1522:351}

\IBVSTchk{GSC 1522:1350}

\hrule

\IBVSTobs{Private observatory Sch\"usselacher, Wald, 0.15-m Starfire refractor}

\IBVSTdet{SBIG ST-7 CCD camera}

\IBVSTfil{None}

\IBVSTdata{Upon request from diethelm@astro.unibas.ch} %email


\IBVSTtyp{ E }

\IBVSTrem{
As a byproduct of the ROTSE1 CCD survey, a large number of new
variables have been discovered (Akerlof et al.\ 2000). In a series of
papers, we report unfiltered CCD observations for some of the close
binary systems (type E) in the list of Akerlof et al.\ (2000). This
installment contains information on four variables in the constellation
Hercules.  The four stars were observed with our CCD equipment as
mentioned above during 6 nights between JD 2452056 and JD 2452082. A
total of 122 CCD frames were measured of GSC 2066:1210 (VAR 1), 119
frames of GSC 2063:902 (VAR 2), 121 frames of GSC 2594:1289 (VAR 3) and
116 frames for GSC 1522:599 (VAR 4).  Figures 1--4 show our observations
folded with the elements:
\begin{center}
\begin{tabular}{ll}
GSC 2066:1210: & JD(min,hel)${} = 2452056.4147 + 0.298052 \times E$; \\
GSC 2063:902:  & JD(min,hel)${} = 2452073.3761 + 0.391676 \times E$; \\
GSC 2594:1289: & JD(min,hel)${} = 2452056.4333 + 0.268179 \times E$; \\
GSC 1522:599:  & JD(min,hel)${} = 2452065.4890 + 0.507924 \times E$. \\
\end{tabular}
\end{center}
These elements of variation are deduced from a linear fit to the normal
minima from the ROTSE1 data (Diethelm 2001) and the timings of minimum
derived from our data given in Bl\"attler (2001).\\
The light curve of GSC 1522:599 attracts attention through the marked
difference in the brightness of the two shoulders between the minima as
well as a possible variability of these brightnesses. In addition, the
period should be checked because the number of revolutions between the
ROTSE1 data and our new photometry is somewhat ambiguous.}

\IBVSTack{This research made use of the SIMBAD data base, operated
at CDS, Strasbourg, France.}

\references

Akerlof, C., Amrose, S., Balsano, R., Bloch, J., Casperson, D., Fletcher,
S., Gisler, G., Hills, J., Kehoe, R., Lee, B., Marshall, S., McKay, T., Pawl,
A., Schaefer, J., Szymanski, J., Wren, J., 2000, {\it AJ}, {\bf 119}, 1901

Bl\"attler, E., 2001, {\it BBSAG Bulletin}, {\bf 126}, in preparation

Diethelm, R., 2001, {\it IBVS}, No.\ 5060

\end{document}

