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\input ibvs2.sty
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\IBVShead{5361}{8 January 2003}

\IBVStitletl{Photoelectric Minimum Times of Some}{ Eclipsing Binary Stars}

\IBVSauth{Ak, H.$^1$; \"{O}zeren, F. F.$^2$; Ekmek\c{c}\.{i}, F.$^1$}

\IBVSinst{Ankara University Observatory, Faculty of Science, 06100, Tando\u{g}an, Ankara, Turkey; \\
e-mails: ak@astro1.science.ankara.edu.tr, ekmekci@astro1.science.ankara.edu.tr}

\IBVSinst{Erciyes University, Faculty of Science and Art, Astronomy and Space Sciences Dept., 38039, Kayseri, Turkey; \\
e-mail: ozeren@erciyes.edu.tr}

\SIMBADobj{BK Peg}
\SIMBADobj{U Cep}
\SIMBADobj{EM Cep}
\SIMBADobj{CQ Cep}
\SIMBADobj{IU Aur}
\SIMBADobj{ER Vul}


\IBVStyp{ E }
\IBVSkey{Binaries: eclipsing; Minimum Times}

\IBVSabs{We present 12 minimum times of 6 eclipsing binaries observed in the}
\IBVSabs{years from 1996 to 1999.}

\begintext


\IBVSEobs{40-cm Cassegrain telescope of the T\"{U}B\.{I}TAK National
Observatory and 30-cm Maksutov telescope of the Ankara University
Observatory.}

\IBVSEdet{OPTEC SSP-5A photometer containing a side-on R1414 Hamamatsu
photomultiplier.}


\IBVSEred{Reduction of the observations were made in the usual way (Hardie
1962).}

\IBVSfoot{T\"{U}B{\.I}TAK : The Scientific and Technical Research Council
of Turkey}

\IBVSEmethod{Kwee \& van Woerden (1956).}


{\small
\IBVSEstars{
BK Peg & EA/D     & 23\hr 47\mm 08\sec & +26\deg 34\arcm 00\arcs & HD 223154 & 41587.725618 & 5.48991138 & 1 \\
U Cep  & EA/SD    & 01\hr 02\mm 18\sec & +81\deg 52\arcm 32\arcs & HD 6006   & 20354.6993   & 2.4929034  & 2 \\
EM Cep & EW/KE    & 21\hr 53\mm 48\sec & +62\deg 36\arcm 52\arcs & HD 208440 & 40134.7326   & 0.806187   & 3 \\
CQ Cep & EB/DM/WR & 22\hr 36\mm 54\sec & +56\deg 54\arcm 21\arcs & HD 214259 & 50267.43158  & 1.6412299  & 4 \\
IU Aur & EB/SD    & 05\hr 27\mm 52\sec & +34\deg 46\arcm 58\arcs & HD 35619  & 38448.4068   & 1.811474   & 5 \\
ER Vul & EW/DW/RS & 21\hr 02\mm 26\sec & +27\deg 48\arcm 26\arcs & HD 200546 & 40182.2621   & 0.69809409 & 6 \\
}
}


\IBVSEsource{
1.: Demircan et al. (1994);
2.: Kim, C-H. and Han, W. (1996);
3.: Breinhorst and Karimie (1980);
4.: Demircan et al. (1997);
5.: Mayer and Drechsel (1987);\\
6.: {\.I}bano\u{g}lu et al. (1985)
}


\IBVSEmin{
BK Peg  & 50319.4175 & 0.0004 &  II & $UBV$  & $-$0.0121 & MT, BC  \\
        & 50706.4701 & 0.0003 &  I  & $UBV$  &    0.0016 & MT, BC  \\
        & 51052.3325 & 0.0007 &  I  & $UBV$  & $-$0.0004 &   HA    \\
        & 51137.4160 & 0.0004 &  II & $UBV$  & $-$0.0105 &   HA    \\
U Cep   & 51138.3074 & 0.0001 &  I  & $UBV$  & $-$0.0095 &   HA    \\
        & 51381.3993 & 0.0008 &  II & $BVR$  &    0.0243 &   HA    \\
EM Cep  & 50709.4090 & 0.0001 &  I  & $UBV$  & $-$0.0784 &   HA    \\
CQ Cep  & 51013.3843 & 0.0003 &  II & $UBV$  &    0.0137 &   HA    \\
        & 51022.3990 & 0.0002 &  I  & $UBVR$ &    0.0016 &   HA    \\
IU Aur  & 50737.4515 & 0.0005 &  I  & $UBV$  &    0.0050 &   HA    \\
        & 50872.3901 & 0.0006 &  II & $UBV$  & $-$0.0111 &   HA    \\
ER Vul  & 50640.4202 & 0.0002 &  I  & $BV$   &    0.0106 & FF\"{O} \\
        & 50669.3908 & 0.0002 &  II & $BV$   &    0.0103 & FF\"{O} \\
}


\IBVSEremexp{Observers: MT: Mehmet TANRIVER, BC: Bekir CANDAN, HA: Hasan AK, \\ FF\"{O}: Ferhat F. \"{O}ZEREN}


\IBVSEack{The authors would like to thank the {\it T\"{U}B{\.I}TAK National
Observatory (TUG)} for the observing time. And also special thanks to the observers for their help.}


\references


Breinhorst, R. A. and Karimie, M. T., 1980, {\it PASP}, {\bf 92}, 432

Demircan, O., Kaya, Y., T\"{u}fek\c{c}io\u{g}lu, Z., 1994, {\it Ap\&SS}, {\bf 222}, 213

Demircan, O., Ak, H., \"{O}zdemir, S., Tanr{\i}ver, M., Albayrak, B., 1997, {\it AN}, {\bf 318}, 267

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

{\.I}bano\u{g}lu, C., Akan, M. C., Evren, S., Tunca, Z., 1985, {\it IBVS}, 2782

Kim, C-H., Han, W., 1996, {\it JASS}, {\bf 13}, 140

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

Mayer, P. and Drechsel, H., 1987, {\it A\&A}, {\bf 183}, 61


\endreferences

\end{document}

