\documentstyle[twoside,epsf]{article}
\input ibvs2.sty
\input ibvst.sty
\begin{document}
\IBVShead{5317}{4 October 2002}

\IBVStitle{CCD Photometry of the SX Phoenicis Star BL Camelopardalis}

\IBVSauth{Wolf, M.$^1$; Crl\'ikov\'a, M.$^1$; Ba\v{s}ta, M.$^1$; \v{S}arounov\'a, L.$^2$; \v{S}t\v{e}p\'an, J.$^1$; \v{S}v\'eda, L.$^1$; Vym\v{e}tal\'ik, O.$^1$}

\IBVSinst{Astronomical Institute, Charles University Prague,
 V Hole\v{s}ovi\v{c}k\'ach 2, CZ-180 00 Praha 8, 
 Czech Republic\\ \indent e-mail: {\tt wolf@cesnet.cz}}

\IBVSinst{Astronomical Institute, Academy of Sciences, 
  CZ-251 65  Ond\v{r}ejov, Czech Republic, e-mail: {\tt lenka@asu.cas.cz}}


\SIMBADobjAlias{BL Cam}{GD 428}
\IBVStyp{ DSCT }
\IBVSkey{CCD photometry}
\IBVSabs{This note presents 14 new times of maximum light for BL Cam}
\IBVSabs{collected at Ond\v{r}ejov observatory in 2001/2002.}


\begintext

\IBVSTnam{BL Cam = GD 428}

\IBVSTcoo{03\hr 47\mm 19\fsec0}{+63\deg 22\arcm 46\arcs}{2000}

\IBVSTobs{Ond\v{r}ejov Observatory, 0.65-m reflecting telescope}

\IBVSTdet{Apogee AP7 CCD camera in primary focus, Peltier cooled}

\IBVSTfil{V}

\IBVSTdateobs{November 2001 - September 2002}

\IBVSTcomp{GSC 4067.0077, GSC 4067.0071, GSC 4067.0748}

\IBVSTdata{Upon request.}

\IBVSTtyp{ DSCT, SX Phe }

\IBVSTrem{We cannot confirm the result of Hintz et al. (1997) 
that the star has a constantly increasing pulsational period. 
See the $O - C$ diagram (drawn using all the data from the
literature) enclosed. This star deserves a continuous monitoring.}

\IBVSTack{This work was supported by the research plan J13/98: 113200004
Investigations of the Earth and the Universe.
This research has made use of the SIMBAD database, operated at CDS,
Strasbourg, France, and of NASA's Astrophysics Data System Bibliographic
Services.}


\IBVSfig{8cm}{5317-f1.eps}{The $O - C$ diagram for BL~Cam using the ephemeris given in Hintz et al. (1997). The solid curve is a second-order polynomial fit to all measurements of previous observers.}
%\IBVSfigKey{5317-f1.eps}{BL Cam{O-C diagram}

\begin{table}
\caption{New precise times of maximum light for BL Cam.} 
\vskip 3mm
\begin{center}
\begin{tabular}{lllc}
\hline
  JD Hel. $-$ & Error& Observers  &  \\ [2pt]
 24 00000   & [days] &            &  \\ \hline
52229.4277  & 0.0002 &  MB, L\v{S}v & \\
52229.4672  & 0.0002 &  MB, L\v{S}v & \\
52279.6288  & 0.0005 &  MW      & \\
52320.2527  & 0.0002 &  MC, MW  & \\
52320.2919  & 0.0002 &  MC, MW  & \\
52320.3318  & 0.0002 &  MC, MW  & \\
52320.3712  & 0.0002 &  MC, MW  & \\
52320.4091  & 0.0002 &  MC, MW  & \\
52369.3203  & 0.0002 &  MW, L\v{S}a  & \\
52522.5843  & 0.0005 &  MW      & \\
52522.6238  & 0.0005 &  MW      & \\
52530.4021  & 0.0002 &  J\v{S}, OV & \\
52530.4414  & 0.0002 &  J\v{S}, OV & \\
52530.4806  & 0.0002 &  J\v{S}, OV & \\
\hline
\end{tabular}
\end{center}
\end{table}

\reference 
Hintz, E.G., Joner, M.D., McNamara, D.H., et al., 1997, {\it PASP}, {\bf 109}, 15


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