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

\begin{document}

\IBVShead{5658}{10 November 2005}

\IBVStitle{Discovery of a New Pulsating Star: GSC 04619-00846}

\IBVSauth{Zhang, X. B.; Xing, L. F.}

\IBVSinsto{National Astronomical Observatory, Chinese Academy of
Sciences, Beijing, 100012, China\\
 e-mail: xzhang@bao.ac.cn, lfxing@bao.ac.cn }

\SIMBADobj{GSC 04619-00846}


\begintext

\IBVSTnam{GSC 04619-00846}

\IBVSTcoo{01\hr 14\mm 00\fsec7}{+84\deg 45\arcm 26\farcs5}{2000}

\IBVSTobs{Xinglong Station, Beijing Astronomical Observatory,
60~cm reflector}

\IBVSTdet{CCD, 1024$\times$1024}

\IBVSTfil{BV}

\IBVSTdateobs{2005.10.03, 2005.10.04, 2005.10.07}

\IBVSTcomp{GSC 04619-00369}

\IBVSTchk{GSC 04619-01518}

\IBVSTsysn

\IBVSTtyp{ $\delta$ Sct  }

\IBVSTdata{{\tt 5658-t1.txt} (V), {\tt 5658-t2.txt} (B)}
\IBVSedata{5658-t1.txt}
\IBVSdataKey{5658-t1.txt}{GSC 04619-00846}{photometry}
\IBVSedata{5658-t2.txt}
\IBVSdataKey{5658-t2.txt}{GSC 04619-00846}{photometry}

\IBVSTrem{The variability of GSC04619-00846 was discovered during a follow-up 
observation on the suspected beta Cephei-type variable GSC04619-00450 
previously discovered by us (Zhang et al., 2004). 
We report the discovery of oscillations of the
star GSC 04619-00846. B and V CCD photometry observations of the
star are presented. In Fig. 1 we plot the light curves collected
in both filters. It shows obvious periodic light changes with
a total amplitude of about 0\fmm04. To search for periodicity of the
light variations, a Fourier analysis was performed by using the
algorithm Period04 (Lenz \& Breger, 2005). Fig. 2 represents the
amplitude spectra produced from the B and V data. A dominant
frequency of $f=13.546\pm 0.009$ c/d, corresponding to a period of
$P=0.0738\pm 0.0001$ days is determined for the star. In addition,
two more frequencies can be detected at $8.911\pm 0.013$ c/d and
$18.600\pm0.014$ c/d. This suggests that GSC 04619-00846 could be
pulsating with multi-periods. Adopting the B and V magnitudes of
the check star GSC 04619-01518, B=11.7 and V=10.6 (H{\o}g et al.,
2000), the color indices of the variable can be estimated as
$B-V\simeq$0.4, which suggests a spectral type of about F3 for the
star. Therefore we conclude that GSC 04619-00846 could be very
probably a new $\delta$ Scuti variable. }

%\IBVSTack{}

\IBVSfig{11cm}{5658-f1.eps}{B and V light curves of GSC 04619-00846}
\IBVSfigKey{5658-f1.eps}{GSC 04619-00846}{light curve}

\newpage

\IBVSfig{11cm}{5658-f2.eps}{Amplitude spectrum of all the data}
\IBVSfigKey{5658-f2.eps}{GSC 04619-00846}{periodogram}

\IBVSefigure{5658-f3.ps}
\IBVSfigKey{5658-f3.ps}{GSC 04619-00846}{finding chart}
\IBVSecomment{Finding chart}

\references

H{\o}g, E., Kuzmin, A., Bastian, U., Fabricius, C., Kuimov, K., Lindegren,
L., Makarov, V.V., Roeser, S., 1998, {\it A\&A}, {\bf 335}, L65

Lenz, P., Breger, M., 2005, {\it Comm. in Asteroseismology}, {\bf 146},
53

Zhang, X.B.; Deng, L.; Zhou, X.;  Xin, Y., 2004, {\it MNRAS}, {\bf 355}, 1369

\endreferences

\end{document}
