\documentstyle[twoside, epsf]{article}

\input ibvs2.sty
\input ibvse.sty

\begin{document}
\IBVShead{5313}{5 September 2002}

\IBVStitle{New Times of Minima of Eclipsing Binary Systems}

\IBVSauth{Borkovits, Tam\'as$^1$;  B\'ir\'o, Imre Barna$^1$; Heged\"us, Tibor$^1$; Csizmadia, Szil\'ard$^2$; Kov\'acs, Tam\'as$^{3,4}$; K\'osp\'al, \'Agnes$^{3,4}$; P\'al, Andr\'as$^{3,4}$; K\"onyves, Vera$^3$; Mo\'or, Attila$^2$ }

\IBVSinst{Baja Astronomical Observatory  of B\'acs-Kiskun County,
Baja, Szegedi \'ut, P.O. Box 766, H--6500 Hungary\\ \indent e-mail: borko@electra.bajaobs.hu}
\IBVSinst{Konkoly Observatory of the Hungarian Academy of Sciences,
H--1525 Budapest, P. O. Box 67, Hungary}
\IBVSinst{Department of Astronomy, E\"otv\"os Lor\'and University,
Budapest, P.O. Box 32, H--1518 Hungary}
\IBVSinst{on summer training at Baja Astronomical Observatory}

\SIMBADobj{AB And}
\SIMBADobj{OO Aql}
\SIMBADobj{IM Aur}
\SIMBADobj{AS Cam}
\SIMBADobj{VW Cep}
\SIMBADobj{XX Cep}
\SIMBADobj{DK Cyg}
\SIMBADobj{LS Del}
\SIMBADobj{AK Her}
\SIMBADobj{GU Her}
\SIMBADobj{HS Her}
\SIMBADobj{V994 Her}
\SIMBADobj{UV Leo}
\SIMBADobj{W UMa}
\SIMBADobj{DW UMa}
\SIMBADobj{GSC 03822-01056}
\IBVStyp{E}
\IBVSkey{Photoelectric photometry, Binaries: eclipsing}
\IBVSabs{We present several photoelectric minima observations of 15 eclipsing binaries.}

\begintext

\IBVSEobs{50-cm $f/8.4$ Ritchey--Chr\'etien telescope of the Baja
Astronomical Observatory (Hungary)\\ 50-cm $f/15$ Cassegrain telescope,
60/90cm Schmidt-telescope and 1m $f/13.3$ RCC telescope of the Konkoly
Observatory at Piszk\'estet\H o Mountain Station (Hungary)}

\IBVSEdet{SBIG ST-7 CCD camera (ST7)\\ 
&Apogee AP-7 CCD camera (AP7)\\
&UBVRI Photometer (Pi50)\\
&Photometrics CCD-camera(Schmidt, 1m RCC)}

\IBVSEred{Reduction of the CCD frames was made with a customly developed
IRAF\footnotemark \, package.}

\footnotetext{IRAF is distributed by the National Optical Astronomical
Observatories, operated by the Association of the Universities for
Research in Astronomy, Inc., under cooperative agreement with the
National Science Foundation}

\IBVSEmethod{The minima times were computed
with parabolic fitting, and in some cases with linearized
Pogson-method or Kwee-van Woerden method (Kwee \& van Woerden, 1952).}

{\small
\IBVSEstars{
AB And & EW & 23 11 32 & +36 53 35 & BD+36$\deg$5018 & 51534.2504 & 0.33189106 & 1 \\
OO Aql & EW & 19 48 13 & +09 18 32 & 1058-0689 & 38613.2222 & 0.50678848 & 2 \\
IM Aur & EA & 05 15 30 & +46 24 21 & 3358-1208 & 38327.7974 & 1.2472891 & 3 \\
AS Cam & EA & 09 05 29 & +69 29 45 & HD 35169  & 44939.24524 & 3.4309638 & 4 \\
VW Cep & EW & 20 37 21 & +75 35 57 & BD+75$\deg$ 739 & 44157.4131 & 0.2783146 & 2 \\
XX Cep & EA & 23 38 20 & +64 20 03 & 4288-0150 & 44839.8022 & 2.3373266 & 2 \\
DK Cyg & EW & 21 35 03 & +34 35 45 & 2712-1841 & 51000.0999 & 0.4706929 & 5 \\
LS Del & EB & 20 57 10 & +19 38 59 & 1656-0356 & 51000.2257 & 0.36384021 & 5 \\
AK Her & EW & 17 13 58 & +16 21 01 & 1536-1266 & 42186.4600 & 0.42152201 & 2 \\
GU Her & EA & 16 32 05 & +30 23 10 & 2581-1969 & 50983.46694 & 4.34320188 & 6 \\
HS Her & EA & 18 50 50 & +24 43 12 & 2113-1427 & 40146.6080 & 1.637438 & 2\\
V994 Her & EA & 18 27 46 & +24 41 51 & BD+24$\deg$ 3426 & 48501.1239 & 2.08309 & 7 \\
UV Leo & EA & 10 38 21 & +14 16 04 & 0845-0255 & 38440.72633 & 0.60008478 & 2 \\
V1353 Ori & EW & 05 42 58 & -00 42 46 & 4767-0774 & 50100.26097 & 0.4714531 & 8 \\ 
W UMa  & EW & 09 43 45 & +55 57 09 & 3810-1196 & 50554.7444 & 0.33363554 & 9 \\
DW UMa & EA & 10 33 53 & +58 46 54 & 3822-0772$^*$ & 46229.00691 & 0.13660653 & 10\\
&&&&3822-0070$^{**}$&&&\\
&&&&3822-0072$^{***}$&&&\\
GSC 3822-1056 & EW & 10 33 58 & +58 52 16 & 3822-0772$^*$ & 50495.5212 & 0.30989069 & 11 \\
&&&&3822-0070$^{**}$&&&\\
&&&&3822-0072$^{***}$&&&\\
}  
}

\IBVSEsource{
1. Pribulla et al., 2001 \\
2. Kholopov et al., 1985 \\
3. Bartolini \& Zoffoli, 1986 \\
4. Kozyreva et al., 1996 \\
5. Kiss et al., 1999 \\
6. Borkovits et al., 2001 \\
7. ESA, 1997 \\
8. present paper \\
9. Morgan et al., 1997 \\
10. B\'\i r\'o, 2000\\
11. B\'\i r\'o \& Borkovits, 2000 
}


{\small
\IBVSEmin{
AB And & 52511.3418 & 1 & I & $V$     & $0.0041$ & Csiz/1m RCC \\
OO~Aql & 52481.5095 & 1 & I & $R,V,B$ & $0.0205$ & B\'\i r+Kov/AP7 \\
IM~Aur & 52304.281  & 1 &II & $V$ & $-0.014$ & Bor/AP7 \\
& 52305.529 & 1 & II & $V$ & $-0.014$ & B\'\i r/AP7 \\
AS Cam & 52365.3753  & 2 & II & V & $-0.1911$  &  Mo\'or+K\"ony/Schmidt \\
VW~Cep & 52506.4320 & 2 & I & $V,R$ & $0.1375$ & Bor/Pi50 \\
& 52506.4329 & 2 &  I & $B$ & $0.1384$ & Bor/Pi50  \\
XX~Cep & 52466.4673 & 3 & I & $V$ & $-0.0316$ & Bor/AP7 \\
DK Cyg & 52512.4415 & 1 & I &$V,R,I$& $0.0053$ &Csiz/1m RCC \\
LS~Del & 52200.3569 & 2 & II & $R$ & $0.0043$ & Bor/AP7 \\
AK~Her & 52360.5365 & 1 & II & $R$ & $0.0105$ & Bor/AP7 \\
& 52437.4639 & 1 & I & $R$ & $0.0101$ & Bor/AP7  \\
GU~Her & 52338.557  & 1 &  I & $R$ & $0.011$ & Bor/AP7 \\
& 52362.432 & : & II & $R$ & $-0.002$ & Bor/AP7 \\
HS~Her & 52417.5275 & 2 & I & $V$ & $-0.0409$ & B\'\i r/AP7 \\
V994~Her & 52488.4984 & 6 & I: &R& $0.3402$ & B\'\i r+Kov+K\'os+P\'al/AP7 \\
& 52488.4994 & 1 & I: & $V$ & $0.3412$ & B\'\i r+Kov+K\'os+P\'al/AP7 \\
& 52488.4997 & 3 & I: & $B$ & $0.3415$ & B\'\i r+Kov+K\'os+P\'al/AP7 \\
}
\IBVSEmin{
UV~Leo & 52307.5076 & 7 & I & $V$ & $0.0222$ & Bor/AP7 \\
V1353~Ori & 51952.3645 & 1 & II & $-$ & $0.0000$ & Heg/AP7 \\
W UMa & 52364.5035  & 1 & II&$b,y$&$-0.0469$ & Csiz/ 1m RCC  \\
DW~UMa & 52298.4349 & 1 & I & $V$ & $-0.0001$ & Bor/AP7$^*$ \\
& 52298.5708 & 3 &  I & $V$ & $-0.0008$ & Bor/AP7$^*$ \\
& 52347.4769 & 5 &  I & $R$ & $0.0001$ & Bor/AP7$^{**}$ \\
& 52347.6132 & 1 &  I & $R$ & $-0.0002$ & Bor/AP7$^{**}$ \\
& 52366.3283 & 1 &  I & $R$ & $-0.0002$ & Bor/AP7$^{***}$ \\
GSC~3822~1056&52263.4567&2& I & $-$ & $0.0024$ & Bor/ST7$^{**}$ \\
& 52298.480 & 1 &  I & $V$ & $0.008$ & Bor/AP7$^*$ \\
& 52298.626 & 1 & II & $V$ & $-0.001$ & Bor/AP7$^*$ \\
& 52347.4387 & 1 &  I & $R$ & $0.0036$ & Bor/AP7$^{**}$ \\
& 52347.5950 & 5 & II & $R$ & $0.0049$ & Bor/AP7$^{**}$ \\
& 52366.3401 & 2 &  I & $R$ & $0.0016$ & Bor/AP7$^{***}$ \\
& 52366.497 & 1 & II & $R$ & $0.004$ & Bor/AP7$^{***}$ \\
}

}

\IBVSEremexp{Observer(s)/Instrument \\
Asterisks indicate the comparison stars used in the actual reduction 
of DW~UMa and GSC~3822~1056, as labeled in Table `Observed star(s)'.}

\IBVSEack{This work was partly supported by National Grant OTKA T030743
and T034551. KV thank the hospitality of the staff of the Konkoly
Observatory.}

\references

Bartolini, C., Zoffoli, M., 1986, {\it A\&A}, {\bf 168}, 377

B\'\i r\'o, I.B., 2000, {\it A\&A}, {\bf 364}, 573

B\'\i r\'o, I.B., Borkovits, T., 2000, {\it IBVS} 4967

Borkovits, T., B\'\i r\'o, I.B., Kov\'acs, T., 2001, {\it IBVS} 5206

ESA, 1997, {\it The Hipparcos and Tycho Catalogues}

Morgan, N., Sauer, M., Guinan, E., 1997, {\it IBVS}  4517

Kholopov, P.N., et al., 1985, {\it General Catalog of Variable Stars}, 4th Eds.

Kiss, L.L., Kasz\'as, G., F\H ur\'esz, G., Vink\'o, J., 1999, {\it IBVS} 4681

Kozyreva, V.S., Zakharov, A.I., Khaliullin, Kh.F., 1996, {\it IBVS} 4690

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

\end{document}



