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\begin{document}
\IBVShead{5069}{8 May 2001}

\IBVStitletl{Photoelectric Minima Times}{ of Some Eclipsing Binaries}

\IBVSauth{Albayrak, B.; G\"{u}rol, B.}

\IBVSinsto{Ankara University Observatory, Faculty of Science, 06100,
Tando\u{g}an, Ankara, Turkey \\
\indent e-mails: albayrak@astro1.science.ankara.edu.tr, birol@astro1.science.ankara.edu.tr}

\SIMBADobj{44 Boo}
\SIMBADobj{WY Cnc}
\SIMBADobj{SW Lac}
\SIMBADobj{UV Lyn}
\SIMBADobj{DI Peg}
\IBVStyp{ M }
\IBVSkey{minima times} 
\IBVSabs{We present 24 photoelectric minima of 5 selected eclipsing binaries.}

\begintext

We present 24 photoelectric minima times of 5 selected eclipsing binary
systems. All observations were obtained with the 30-cm Maksutov
telescope at the Ankara University Observatory. Differential
observations were secured by using an OPTEC SSP-5A photometer head
which contains a side on R-1414 Hamamatsu photomultiplier. The filters
used are in close accordance with the standard Johnson's $UBV$ and
reductions of the observations have been performed in the usual way
(Hardie, 1962).

The moments of minima and their standard errors for each filter were
calculated by using the well known method of Kwee \& van Woerden
(1956). All results are listed in Table~1 with the minimum types,
filters and observers.

\begin{table}
\caption{Minima times of the observed systems}
\begin{center}
\begin{tabular}{lccccc}
\hline
\lower6pt\hbox{System} & Min HJD & \lower6pt\hbox{Error} & Min & \lower6pt\hbox{Filter} & Observer \\[-4pt]
 & 2400000\,+ & & type & & (*) \\
\hline 
44i Boo & 51851.26017 & $\pm$0.00049 & I & {\it B} & Gr \\
 & 51851.26598 & $\pm$0.00353 & I & {\it V} & Gr \\
WY Cnc & 51958.37627 & $\pm$0.00021 & I & {\it B} & \"{O}z \\
 & 51958.37546 & $\pm$0.00033 & I & {\it V} & \"{O}z \\
SW Lac & 51738.44838 & $\pm$0.00056 & I & {\it U} & Ad \\
 & 51738.44924 & $\pm$0.00093 & I & {\it B} & Ad \\ 
 & 51738.44911 & $\pm$0.00069 & I & {\it V} & Ad \\
 & 51874.27251 & $\pm$0.00045 & II & {\it U} & Ny \\
 & 51874.27339 & $\pm$0.00043 & II & {\it B} & Ny \\
 & 51874.27334 & $\pm$0.00036 & II & {\it V} & Ny \\
 & 51881.32895 & $\pm$0.00067 & II & {\it U} & Tn \\
 & 51881.32785 & $\pm$0.00018 & II & {\it B} & Tn \\
 & 51881.32784 & $\pm$0.00022 & II & {\it V} & Tn \\
 & 51888.22210 & $\pm$0.00028 & I & {\it U} & Dn \\
 & 51888.22195 & $\pm$0.00020 & I & {\it B} & Dn \\
 & 51888.22185 & $\pm$0.00021 & I & {\it V} & Dn \\
UV Lyn & 51935.41371 & $\pm$0.00028 & I & {\it U} & Gd \\ 
 & 51935.41595 & $\pm$0.00032 & I & {\it B} & Gd \\
 & 51935.41661 & $\pm$0.00021 & I & {\it V} & Gd \\
 & 51949.51982 & $\pm$0.00024 & I & {\it B} & Ak \\
 & 51949.52276 & $\pm$0.00042 & I & {\it V} & Ak \\
DI Peg & 51035.40130 & $\pm$0.00021 & I & {\it U} & Gr \\
 & 51035.40058 & $\pm$0.00028 & I & {\it B} & Gr \\
 & 51035.40044 & $\pm$0.00021 & I & {\it V} & Gr \\ 
\hline
\end{tabular}

\normalsize
(*) Ad: E. Adal{\i}, Ak: U. Ak\c{c}ay, Dn: \"{O}. Dengiz, Gd: L. G\"{u}rdemir,\\ 
Gr: B. G\"{u}rol, Ny: N. Naymaz, \"{O}z: F. \"{O}zkan, Tn: E. T{\i}naz
\end{center}
\end{table}

\vfill

\references

Hardie, R., 1962, {\it Astr.\ Tech.: Stars and Stellar Systems}, Vol.\ II,
Univ.\ of Chicago Press, Chicago

Kwee, K. K. \& van Woerden, H., 1956, {\it Bull.\ Astron.\ Inst.\ Neth.},
{\bf 12}, 327

\endreferences


\end{document}

