\documentstyle[twoside, ibvs2, epsf]{article}
\input ibvse.sty

\begin{document}

\IBVShead{5306}{14 August 2002}

\IBVStitletl{CCD Light Curves of ROTSE1 Variables, XVI: GSC\,2613:1412 H\lowercase{er,}}{ GSC\,3098:683 H\lowercase{er,} GSC\,3098:1253 H\lowercase{er,} AND GSC\,2083:1870 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{ROTSE1 J172631.22+350115.6}
\SIMBADobj{ROTSE1 J172803.29+434125.8}
\SIMBADobj{ROTSE1 J172844.89+434818.8}
\SIMBADobj{ROTSE1 J173327.94+265547.5}


\begintext

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

\IBVSEdet{SBIG ST-7 CCD camera}

\IBVSEred{Standard CCD-frame reduction using AIP4WIN software}

\IBVSEmethod{Kwee -- van Woerden algorithm}

{\small
\IBVSEstarlis{GSC\,2613:1412 &&&& \\
ROTSE1 J172631.22+350115.6 & EW & 17 26 31.2 & +35 01 16 & GSC\,2613:287 / 
GSC\,2613:1372  \\
 GSC\,3098:683 &&&& \\
ROTSE1 J172803.29+434125.8 & EW & 17 28 03.3 & +43 41 26 & GSC\,3098:851 / 
GSC\,3098:1091  
\\
 GSC\,3098:1253 &&&& \\
ROTSE1 J172844.89+434818.8 & EW & 17 28 44.9 & +43 48 19 & GSC\,3098:1639 / 
GSC\,3098:1750  \\
 GSC\,2083:1870 &&&& \\
ROTSE1 J173327.94+265547.5 & EW & 17 33 27.9 & +26 55 48 & GSC\,2083:1693 / 
GSC\,2083:426  
\\
}  
}  


\IBVSEephem{ROTSE1 J172631.22+350115.6 & 52426.5561 & 0.392124 & present paper 
\\
ROTSE1 J172803.29+434125.8 & 52442.5724 & 0.415381 & " \\
ROTSE1 J172844.89+434818.8 & 52463.4300 & 0.241415 & " \\
ROTSE1 J173327.94+265547.5 & 52463.4068 & 0.360847 & " \\
}

\IBVSEmin{
GSC2613:1412 (Her) & 51275.8698 & 21 & s & none && ROTSE1 \\
                        & 52411.4620 & 27 & s & none && \\
                        & 52415.3808 & 11 & s & none && \\
                        & 52426.365 & 4 & s & none && \\
                        & 52426.5554 & 5 & p & none && \\
                        & 52442.4360 & 6 & s & none && \\
                        & 52463.4162 & 7 & p & none && \\
                        & 52483.4150 & 3 & p & none && \\
GSC3098:683 (Her) & 51288.8526 & 6 & s & none && ROTSE1 \\
		& 51295.7058 & 6 & p & none && ROTSE1 \\
                        & 52411.4195 & 13 & p & none && \\
                        & 52415.3662 & 4 & s & none && \\
                        & 52426.3725 & 14 & p & none && \\
                        & 52442.5718 & 9 & p & none && \\
                        & 52463.5488 & 3 & s & none && \\
                        & 52483.4866 & 10 & s & none && \\
GSC3098:1253 (Her) & 51283.7609 & 20 & s & none && ROTSE1 \\
                        & 51288.7022 & 13 & p & none && ROTSE1 \\
                        & 52411.4089 & 33 & s & none && \\
		& 52411.5252 & 8 & p & none && \\
                        & 52415.3878 & 11 & p & none && \\
                        & 52426.3761 & 20 & s & none && \\
                        & 52426.4918 & 8 & p & none && \\
                        & 52442.4264 & 6  & p & none && \\
                        & 52442.5477 & 21 & s & none && \\
                        & 52463.4289 & 11 & p & none && \\
                        & 52463.5515 & 10 & s & none && \\
                        & 52475.379 & 4 & s & none && \\
		& 52475.5031 & 10 & p & none && \\
		& 52483.4650 & 20 & p & none && \\
GSC2083:1870 (Her) & 51306.8926 & 5 & p & none && ROTSE1 \\
                        & 52411.4455 & 20 & p & none && \\
                        & 52415.4139 & 2 & p & none && \\
                        & 52426.4205 & 3 & s & none && \\
                        & 52442.4772 & 9 & p & none && \\
                        & 52463.4064 & 8 & p & none && \\
                        & 52463.5857 & 13 & s & none && \\
                        & 52475.4953 & 6 & s & none && \\
                        & 52483.4344 & 8 & s & none && \\
}


\IBVSEremexp{ROTSE1: Observations of Akerlof et al. (2000).}

\IBVS2fig{7.8cm}{5306-f1.eps}{CCD light curve (without filter) of GSC\,2613:1412}{5306-f2.eps}{CCD light curve (without filter) of GSC\,3098:683}
%IBVSfigKey{5306-f1.eps}{GSC 2613-1412; ROTSE1 J172631.22+350115.6}{light curve}
%IBVSfigKey{5306-f2.eps}{GSC 3098-683; ROTSE1 J172803.29+434125.8}{light curve}

\IBVS2fig{7.8cm}{5306-f3.eps}{CCD light curve (without filter) of GSC\,3098:1253}{5306-f4.eps}{CCDlight curve (without filter) of GSC\,2083:1870}
%IBVSfigKey{5306-f3.eps}{GSC 3098-1253; ROTSE1 J172844.89+434818.8}{light curve}
%IBVSfigKey{5306-f4.eps}{GSC 2083-1870; ROTSE1 J173327.94+265547.5}{light curve}

\IBVSErem{
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 EW) 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 during 7 nights between JD\,2452411 and JD\,2452483. A total of 180 
CCD frames were measured of GSC\,2613:1412, 180 frames of 
GSC\,3098:683, 171 frames of GSC\,3098:1253 and 183 
frames for GSC\,2083:1870. Figures 1 through 4 show our 
observations folded with the elements given in the table of Ephemeris.  
These elements of variation are deduced from a linear fit to the normal 
minima from the ROTSE1 data and the timings of minimum derived from our data 
given in the table of Times of minima and also in Bl\"attler (2002).}

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


\IBVSEack{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., 2002, {\it BBSAG Bulletin}, {\bf 128}

\endreferences

\end{document}
