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\input ibvs2.sty
\input ibvst.sty

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\IBVShead{4966}{20 October 2000}

\IBVStitletl{CCD Light Curves of ROTSE1 Variables, II:}{ GSC\,3100.1616 Herculis}

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

\IBVSinst{BBSAG, Schl\"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 03100-01616}

\begintext

\IBVSTnam{GSC\,3100.1616 = ROTSE1 174311.02+432709.0}

\IBVSTcoo{17\hr 43\mm 11.02\sec}{+43\deg 27\arcm 09.0\arcs}{2000.0}

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

\IBVSTdet{SBIG ST-7 CCD camera}

\IBVSTfil{None}

\IBVSTcomp{GSC\,3100.1679}

\IBVSTchk{GSC\,3100.1797}

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


\IBVSTtyp{ EW }

\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 EW and E) in the list of Akerlof et al.\ (2000).
GSC\,3100.1616 was observed with our CCD equipment as specified above
during 5 nights between JD\,2451746 and JD\,2451781. A total of 158 CCD frames
were measured and Figure 1 shows these observations folded with the elements
$$
{\rm JD(min,hel)} = 2451746.4139 (6) + 0.2581094 (25) \times E.
$$
These elements of variation are deduced from a linear fit to the newly
determined normal minima from the ROTSE1 data (JDH\,2451286.8514(2),
secondary(?); JDH\,2451310.7238(6), primary(?)) as well as the 8 minima
(3 primary, 5 secondary)  published in BBSAG Bulletin 123. Because of 
the uncertainty in the cycle count since the ROTSE1 data, the elements 
given above are in need of affirmation.}

\IBVSfig{10cm}{4966-f1.eps}{CCD light curve (without filter) of GSC\,3100.1616}

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


\reference

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

\end{document}



