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\input ibvse.sty

\begin{document}

\IBVShead{5212}{13 December 2001}

\IBVStitle{New type and elements for the eclipsing binary OT C\lowercase{ep}}

\IBVSsubtitle{(BAV MITTEILUNGEN NO. 142)}

\IBVSauth{Agerer,~F.$^{1,2}$}

\IBVSinsto{\noindent
(1) D-84184 Zweikirchen, Germany, e-mail: agerer.zweik@t-online.de\\
(2) Bundesdeutsche Arbeitsgemeinschaft f\"{u}r Ver\"{a}nderliche Sterne e.V. (BAV),
Munsterdamm 90,\\ D-12169 Berlin, Germany}

\SIMBADobj{OT Cep}

\IBVSTnam{OT Cep}

\IBVSTcoo{0\hr 29\mm 18\sec}{82\deg 10\arcm 9\arcs}{2000}

\IBVSTobs{Private observatory, 20-cm SCT}

\IBVSTdet{SBIG ST6 camera}

\IBVSTfil{none}

\IBVSTcomp{GSC 4504.583}

\IBVSTchk{GSC 4504.663}

\IBVSTsysn

\IBVSTdata{upon request}

\IBVSTtyp{ EW }

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

\IBVSTrem{Several observers tried to improve the elements of OT Cep
  (Bl\"{a}ttler 1999, Nelson 2001). In order to get a complete lightcurve,
  OT~Cep was put on our program. Soon it was clear, that the period has to be 
  halved and it is an eclipsing binary of W~UMa-type. The depths of the primary
  and secondary minima are very different. The light amplitudes are 0\fmm69
  and 0\fmm22 respectively. The minimum times are calculated according to the
  Kwee--van Woerden method (Kwee, van Woerden 1956). A least squares fit to
  the data given in Table~1 led to the new ephemeris: 
\begin{equation}
  \begin{array}{r}  {\rm  Min\,\,  I = HJD\quad} 2449169.4362 \\
  \pm 3\end{array}
  \begin{array}{r}
   + \,\,\,\, 0\fday4812313\\
     \pm 1\end{array}
  \begin{array}{l}\hspace{-1ex}\cdot\rm\,\,E\\
      { }
     \end{array}
\end{equation}
}

\IBVSEmin{
OT Cep & 49169.4354 & .0005 & I   &&$-$0.0008 & [1] \\
       & 49641.5254 & .0003 & I   &&$+$0.0013 & [2] \\
       & 50850.3762 & .0010 & I   &&$-$0.0009 & [3] \\
       & 51363.3704 & .0008 & I   &&$+$0.0007 & [4] \\
       & 51659.80612& .00005& I   &&$-$0.00206& [5] \\
       & 51913.4160 & .0003 & I   &&$-$0.0011 & this paper \\
       & 51913.6596 & .0009 & II  &&$+$0.0019 & this paper \\
       & 51922.3199 & .0020 & II  &&$+$0.0000 & this paper \\
       & 51922.5586 & .0003 & I   &&$-$0.0019 & this paper \\
       & 51955.5257 & .0004 & II  &&$+$0.0009 & this paper \\
}
[1]: H\"{u}bscher, J. et al.~1994,
[2]: Agerer, F., H\"{u}bscher, J.~1995,\newline
[3]: Agerer, F., H\"{u}bscher, J.~1999,
[4]: Bl\"{a}ttler, E. 1999,
[5]: Nelson, R.H. 2001
\bigskip

\IBVSfig{7cm}{5212-f1.eps}{Differential light curve of OT Cep}


\references

Agerer, F., H\"{u}bscher, J., 1995, IBVS 4222 

Agerer, F., H\"{u}bscher, J., 1999, IBVS 4711 

Bl\"{a}ttler, E., 1999, BBSAG Bulletin 120

H\"{u}bscher, J. et al., 1994, BAVM 68

Kwee, K.~K., van Woerden, H., 1956, {\it Bull.~Astr.~Inst.~Netherlands,} {\bf
  12}, No. 464, 327

Nelson, R.H., 2001, IBVS 5040

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