\documentstyle[twoside, ibvs2, epsf]{article}

\input ibvst.sty
\input ibvse.sty
\input epsf.sty

\IBVShead{5295}{8 July 2002}

\begin{document}

\IBVStitletl{CCD LIGHT CURVES OF ROTSE1 VARIABLES, XV: GSC\,2040:1361 C\lowercase{r}B,}{ ROTSE1 GSC\,2579:1125 C\lowercase{r}B, GSC\,2035:175 S\lowercase{er} AND GSC\,2580:2086 C\lowercase{r}B}

\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 J155918.57+275214.9}
\SIMBADobj{ROTSE1 J160014.54+351228.4}
\SIMBADobj{ROTSE1 J160153.55+245217.7}
\SIMBADobj{ROTSE1 J161458.52+301646.1}


\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\,2040:1361 &&&& \\
ROTSE1 J155918.57+275214.9 & EW & 15\hr 59\mm 18\fsec6 & +27\deg 52\arcm 15\arcs & GSC\,2040:1522 / 
GSC\,2040:1563  \\
 GSC\,2579:1125 &&&& \\
ROTSE1 J160014.54+351228.4 & EW & 16\hr 00\mm 14\fsec5 & +35\deg 12\arcm 28\arcs & GSC\,2578:1131 / 
GSC\,2578:1231  
\\
 GSC\,2035:175 &&&& \\
ROTSE1 J160153.55+245217.7 & EW & 16\hr 01\mm 53\fsec6 & +24\deg 52\arcm 18\arcs & GSC\,2035:12 / 
GSC\,2035:109  \\
 GSC\,2580:2086 &&&& \\
ROTSE1 J161458.52+301646.1 & EW & 16\hr 14\mm 58\fsec5 & +30\deg 16\arcm 46\arcs & GSC\,2580:2090 / 
GSC\,2580:1995  
\\
}  
}  


\IBVSEephem{ROTSE1 J155918.57+275214.9 & 52365.5044 & 0.397352 & present paper 
\\
ROTSE1 J160014.54+351228.4 & 52409.4467 & 0.380658 & " \\
ROTSE1 J160153.55+245217.7 & 52365.4575 & 0.268729 & " \\
ROTSE1 J161458.52+301646.1 & 52360.4749 & 0.308193 & " \\
}

\IBVSEmin{
GSC2040:1361 (CrB)        & 51260.8684 & 4 & p & none && ROTSE1 \\
                        & 51310.7335 & 3 & s & none && ROTSE1 \\
                        & 52360.5379 & 5 & s & none && \\
                        & 52365.5046 & 7 & p & none && \\
                        & 52368.4846 & 4 & s & none && \\
                        & 52395.5049 & 15 & s & none && \\
                        & 52409.4117 & 5 & s & none && \\
                        & 52409.6101 & 9 & p & none && \\
                        & 52419.5700 & 5 & p & none && \\
GSC2579:1125 (CrB) 	& 51291.8339 & 4 & p & none && ROTSE1 \\
				& 51305.731 & 2 & s & none && ROTSE1 \\
                        & 52360.5321 & 8 & s & none && \\
                        & 52365.4792 & 9 & s & none && \\
                        & 52368.341 & 6 & p & none && \\
                        & 52368.5276 & 12 & s & none && \\
                        & 52395.3639 & 21 & p & none && \\
                        & 52395.5523 & 24 & s & none && \\
                        & 52409.4459 & 4 & p & none && \\
                        & 52415.5358 & 8 & p & none && \\
GSC2035:175 (Ser)		& 51247.8121 & 1 & p & none && ROTSE1 \\
                        & 51287.7189 & 7 & s & none && ROTSE1 \\
                        & 52359.4103 & 11 & s & none && \\
		        	& 52360.4871 & 7 & s & none && \\
                        & 52360.6191 & 11 & p & none && \\
                        & 52365.4569 & 8 & p & none && \\
                        & 52365.5911 & 5 & s & none && \\
                        & 52368.4142 & 18  & p & none && \\
                        & 52368.5471 & 3 & s & none && \\
                        & 52395.4223 & 17 & s & none && \\
                        & 52395.554 & 3 & p & none && \\
                        & 52409.3972 & 7 & s & none && \\
				& 52409.5282 & 6 & p & none && \\
				& 52415.5762 & 2 & s & none && \\
GSC2580:2086 (CrB) 	& 51246.8236 & 10 & s & none && ROTSE1 \\
                        & 51280.8741 & 12 & p & none && ROTSE1 \\
                        & 52359.3965 & 8 & s & none && \\
                        & 52360.4736 & 3 & p & none && \\
                        & 52360.6273 & 19 & s & none && \\
                        & 52365.4051 & 14 & p & none && \\
                        & 52365.5593 & 8 & s & none && \\
                        & 52368.4874 & 6 & p & none && \\
                        & 52368.6459 & 15 & s & none && \\
                        & 52395.4557 & 12 & s & none && \\
                        & 52409.4776 & 5 & p & none && \\
}


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

\IBVS2fig{7cm}{5295-f1.eps}{CCD light curve (without filter) of GSC\,2040:1361}{5295-f2.eps}{CCD light curve (without filter) of GSC\,2579:1125}

\vspace*{-0.5cm}

\IBVS2fig{7cm}{5295-f3.eps}{CCD light curve (without filter) of GSC\,2035:175}{5295-f4.eps}{CCD light curve (without filter) of GSC\,2580:2086}

\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 constellations Corona Borealis 
and Serpens. The four stars were observed with our CCD equipment
during 7 nights between JD\,2452359 and JD\,2452415. A total of 228 
CCD frames were measured of GSC\,2040:1361, 230 frames of 
GSC\,2579:1125, 226 frames of GSC\,2035:175 and 226 
frames for GSC\,2580:2086. 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).\\
In the case of GSC\,2040:1361 we would like to inform future observers that the
 nearby star GSC\,2040:1491 = ROTSE1 J155859.06+274605.2 = IRAS 15569+2754 is 
itself slowly variable and should therefore not be used as comparison star. 
During our observing session it varied by 0.25 mag, in good agreement with the 
data of the ROTSE1 survey.
}

\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}


\end{document}


