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\input ibvs2.sty
\input ibvse.sty

\begin{document}

\IBVShead{5300}{26 July 2002}

\IBVStitletl{Photoelectric Minima of Some Eclipsing Binary Stars}

\IBVSauth{ALBAYRAK, B.; TANRIVERD{\.I}, T.; AYDIN, C.}

\IBVSinsto{Ankara University Observatory, Faculty of Science, 06100,
\\e-mail: albayrak@astro1.science.ankara.edu.tr, taner@astro1.science.ankara.edu.tr, aydin@science.ankara.edu.tr}


\SIMBADobj{WY Cnc}
\SIMBADobj{BO CVn}
\SIMBADobj{CG Cyg}
\SIMBADobj{AK Her}
\SIMBADobj{SW Lac}
\SIMBADobj{NN Vir}
\SIMBADobj{GR Vir}



\IBVStyp{ Binaries: eclipsing }
\IBVSkey{Minima Times}

\IBVSabs{We present 21 minima times of 7 eclipsing binaries made in the}
\IBVSabs{years of 2001 and 2002.}

\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{Times of minima were determined by the method of Kwee and van
Woerden (1956).}


{\small
\IBVSEstars{
WY Cnc & EA/SD/RS & 09 01 55 & +26 41 22 & BD+27 1708 & 26352.3895 &
0.8293712 & 1 \\
BO CVn & EW       & 13 59 08 & +40 49 09 & BD+41 2450 & 46895.4483 &
0.5174617 & 2 \\
CG Cyg & EA/SD/RS & 20 58 13 & +35 10 29 & BD+34 4216 & 22967.4184 &
0.6311435 & 3 \\
AK Her & EW/KW    & 17 13 57 & +16 21 00 & BD+16 3123 & 22977.2540 &
0.4215221 & 4 \\
SW Lac & EW/KW    & 22 53 41 & +37 56 18 & BD+37 4715 & 51056.2896 &
0.3207151 & 5 \\
GR Vir & EW/KW    & 14 45 20 & $-$06 44 04 & BD$-$06 4066 & 45665.6415 &
0.3469788 & 6 \\
NN Vir &   EB     & 14 19 37 & +05 53 46 & BD+06 2864 & 50595.3452 & 
0.4806900 & 7 \\
}
}


\IBVSEsource{
1.: Hall \& Kreiner (1980);
2.: Albayrak et al. (2001);
3.: Sowell et al. \ (2001);
\\4.: Woodward (1942);
5.: Pribulla et al. \ (2001);
6.: Cereda et al. (1988);
\\7.: Rucinski \& Lu (1999)}


\IBVSEmin{
WY Cnc  & 52308.3696 & 0.0002 &  I  & $BV$  & $-$0.0210  & \c{S}n-Ak     \\
BO CVn  & 52070.3231 & 0.0002 & II  & $UBV$ & $-$0.0010  & Hs-Km         \\
        & 52375.3677 & 0.0002 &  I  & $UBV$ &  0.0000  & Al-Tn         \\    
CG Cyg  & 52196.3029 & 0.0002 &  I  & $UBV$ & $-$0.0021  & Al-$\c{C}$t   \\  
AK Her  & 52112.4686 & 0.0003 &  I  & $UBV$ &  0.0306  & Hs-\c{C}\u{g} \\
        & 52126.3805 & 0.0003 &  I  & $UBV$ &  0.0323  & Hs-\c{C}\u{g} \\ 
SW Lac  & 52188.4083 & 0.0001 &  I  & $BV$  & $-$0.0056  & Tn-Yl         \\
        & 52195.3055 & 0.0002 & II  & $BV$  & $-$0.0038  & Tn-Yr         \\
        & 52195.4641 & 0.0001 &  I  & $BV$  & $-$0.0056  & Tn-Yr         \\
        & 52450.4316 & 0.0004 &  I  & $BV$  & $-$0.0066  & Bl-Tn         \\
GR Vir  & 52375.5126 & 0.0001 &  I  & $BVR$ & $-$0.0050  & Al-Tn         \\
        & 52399.4499 & 0.0003 &  I  & $UBV$ & $-$0.0091  & $\c{C}$t-El   \\ 
        & 52440.3970 & 0.0002 &  I  & $BV$  & $-$0.0055  & Tn-Bl         \\
        & 52443.3443 & 0.0003 & II  & $BV$  & $-$0.0076  & Tn-Bl         \\
        & 52460.3464 & 0.0002 & II  & $BVR$ & $-$0.0075  & Tn-\c{S}n     \\
        & 52464.3366 & 0.0003 &  I  & $BVR$ & $-$0.0075  & Tn-\c{S}n     \\  
NN Vir  & 52405.3689 & 0.0002 & II  & $BV$  & $-$0.0145  & Tn-Sz         \\
        & 52424.3554 & 0.0005 &  I  & $BV$  & $-$0.0153  & Tn-Bl         \\ 
        & 52450.3149 & 0.0003 &  I  & $BV$  & $-$0.0130  & Tn-Bl         \\
        & 52461.3667 & 0.0001 &  I  & $BV$  & $-$0.0171  & Sz-Kr         \\
        & 52462.3300 & 0.0004 &  I  & $BV$  & $-$0.0151  & $\c{C}$t-Ak   \\
}


\IBVSEremexp{Ak: O. Aksu, Al: B. Albayrak, Bl: \.{I}lker Bulca,
\c{C}\u{g}: A. \c{C}a\u{g}lar, \c{C}t: C. \c{C}etinta\c{s}, 
\\El: A. Elmasl{\i}, Hs: E. Hast\"{u}rk, Km: B. K\"{o}m\"{u}rc\"{u}, 
Kr: T. Karaka\c{s}, \c{S}n: H. V. \c{S}enavc{\i}, Sz: A. S. Sezgin, 
Tn: T. Tanr{\i}verdi, Yl: F. Y{\i}ld{\i}z, Yr: E. D. Y\"{o}r\"{u}k}


\IBVSEack{The authors would like to thank the {\it T\"{U}B{\.I}TAK National
Observatory (TUG)} for the observing time. This study was supported by the
{\it T\"{U}BA/GEB{\.I}P} grant of the {\it Turkish Academy of Sciences}}


\references


Albayrak, B., M\"{u}yessero\u{g}lu, Z., \& \"{O}zdemir, S., 2001, {\it AN},
322, 125

Cereda, L., Mist\`o, A., Niarchos, P. G. \& Poretti, E., 1988,
{\it A\&AS}, 76, 255

Hall, D. S., \& Kreiner, J. M., 1980, {\it Acta Astron.}, 30, 387

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

Pribulla, T., Vanko, M., Parimucha, S. \& Chochol, D., 2001, {\it IBVS}, 5056

Rucinski, S. M. \& Lu, W., 1999, {\it AJ}, 118, 2451

Sowell, J. R., Hughes, S. B., Hall, D. S., \& Howard, B. A., 2001, {\it AJ},
122, 1965

Woodward, F. J., 1942, {\it Harvard Obs. Circ.}, No. 446

\endreferences

\end{document}

