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

\begin{document}

\IBVShead{5318}{4 October 2002}

\IBVStitletl{On the Variability of GSC 5149.2845 (Brh V121)}{ and GSC 5170.0175 (Brh V122)}

\IBVSauth{Bernhard, K.$^{1,4}$; Kiyota, S.$^{2}$; Pejcha, O.$^{3}$}

\IBVSinst{A--4030 Linz, Austria, e-mail: kl.bernhard@aon.at}

\IBVSinst{Tsukuba, 305-0031 Japan, e-mail: skiyota@nias.affrc.go.jp}

\IBVSinst{625 00 Brno, Czech Republic, e-mail: pejcha@meduza.info}

\IBVSinst{Bundesdeutsche Arbeitsge\-mein\-schaft f\"{u}r Ver\"{a}nderliche
Sterne e.V. (BAV), Munsterdamm 90,\\ \indent D--12169~Berlin, Germany}

\SIMBADobj{GSC 5149-2845}
\SIMBADobj{GSC 5170-0175}

\IBVStyp{ W UMa }
\IBVStyp{ RRab }

\begintext

{\bf VAR 1:}
\smallskip
\hrule

\IBVSTnam{GSC 5149.2845}

\IBVSTcoo{19\hr38\mm22\fsec2}{$-03\deg32\arcm37\arcs$}{2000}

\IBVSTcomp{GSC 5149.2931, $V\approx11\fmm0$}

\IBVSTchk{GSC 5149.2509}


\IBVSTtyp{ W UMa }

{\bf VAR 2:}
\smallskip
\hrule

\IBVSTnam{GSC 5170.0175}

\IBVSTcoo{20\hr20\mm23\fsec9}{$-03\deg48\arcm59\arcs$}{2000}

\IBVSTcomp{GSC 5170.0119, $V\approx11\fmm3$}

\IBVSTchk{GSC 5166.2478}


\IBVSTtyp{ RRab }

\hrule

\newpage

\IBVSfig{8cm}{5318-f1.eps}{ The phase diagram of GSC 5149.2845, CCD observations of K. Bernhard (filled circles), S. Kiyota (open triangles) and O. Pejcha (open squares), assuming that the comparison star GSC 5149.2931 has $V$=11.0 mag}
%\IBVSfigKey{5318-f1.eps}{GSC 5149-2845}{light curve}

\vspace*{-1.5cm}

\IBVSfig{8cm}{5318-f2.eps}{ The phase diagram of GSC 5170.0175, CCD observations  of K. Bernhard (filled circles), assuming that the comparison star GSC 5170.0119 has $V$=11.3 mag}

\IBVSTobs{K. Bernhard: Private observatory, 20-cm Schmidt-Cassegrain telescope (1);\\
 S. Kiyota: Private observatory, 25-cm Schmidt-Cassegrain telescope (2);\\
O. Pejcha: Brno observatory, 40-cm Newtonian telescope (3)}

\IBVSTdet{K. Bernhard: Starlight Xpress SX CCD camera;\\
& S. Kiyota: SBIG ST-6 CCD camera;\\
& O. Pejcha: SBIG ST-7 CCD camera;}

\IBVSTfil{K. Bernhard: None;\\
& S. Kiyota, O. Pejcha: V}

\IBVSTsysn

\IBVSTdata{Upon request}

\IBVSTrem{ The variability of GSC 5149.2845 and GSC 5170.0175 has been found 
as part of a programme to discover and classify new variables using CCD observations of
selected fields on the edge of the northern Milky Way (Bernhard \&
Lloyd 2000). 
Further observations of 5149.2845 were performed on 9 nights
in the first, on 4 nights in the second and on 3 nights in the third observatory between August and September 2002. GSC 5170.0175 was observed on 7 nights in September 2002 in the first observatory.\\
The ephemeris were calculated using the ``Phase Dispersion Minimization'' method. \\}

\IBVSTrem{The light curves show variations of a W~UMa star for GSC 5149.2845 and of a RRab star for GSC 5170.0175. \\   
Vizier investigations show that GSC 5149.2845 is a likely X-ray source (1RXS J193821.2-033245), which supports the classification as a W~UMa variable.:\\ 
\belowdisplayskip-12pt
GSC 5149.2845:\\
\begin{equation}
\begin{array}{r@{}r@{}l}
{\rm MinI = HJD~}2452522.440 & {} + 0\fday4128 & {} \times E. \\ 
 \pm 7 & \pm 1 \\ 
\end{array}
\end{equation}
GSC 5170.0175:\\
\begin{equation}
\begin{array}{r@{}r@{}l}
{\rm Max = HJD~}2452523.40 & {} + 0\fday5152 & {} \times E. \\ 
 \pm 1 & \pm 1 \\
\end{array}
\end{equation}}

\IBVSTack{This research made use of the SIMBAD data base, operated by
the CDS at Strasbourg, France. The authors thank John Greaves for helpful comments.
O. Pejcha acknowledges overall support and the use of the telescope of the Nicholas
Copernicus Observatory and Planetarium in Brno.}

\reference 

Bernhard, K., Lloyd, C., 2000, {\it IBVS}, No.\ 4920

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