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\input ibvs2.sty
\input ibvst.sty
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\IBVShead{5704}{23 May 2006}

\IBVStitletl{The first complete photometry}{ of the short-period Algol-type binary BF V\lowercase{el}}

\IBVSauth{Manimanis, V. N.; Niarchos, P. G.}

\IBVSinsto{Dept. of Astrophysics, Astronomy and Mechanics, Faculty of Physics, National \& Kapodistrian University of Athens, Athens, Greece; e-mail: vmaniman@phys.uoa.gr}


\SIMBADobj{BF Vel}
\IBVSabs{Complete CCD BVRI light curves of the eclipsing binary BF Vel are}
\IBVSabs{almost symmetric, with the secondary minimum markedly deeper at}
\IBVSabs{longer wavelengths, indicating a large temperature difference between}
\IBVSabs{the components. There is a slight O' Connell effect present in the R}
\IBVSabs{and I curves.}

\begintext

\IBVSTnam{BF Vel, CD$-$39\deg 4980}

\IBVSTcoo{08\hr 56\mm 24\sec}{$-$39\deg 58\arcm 54\arcs}{2000}

\IBVSTobs{South African Astronomical Observatory Sutherland Station, 1.0 m Cassegrain telescope}

\IBVSTdet{CCD camera, liquid nitrogen cooled at 180.5 K, 1024 $\times$ 1024 imaging pixels binned to 512 $\times$ 512, 5\farcm3 $\times$ 5\farcm3 FOV.}

\IBVSTfil{BVRI}

\IBVSTdateobs{2006.01.11, 2006.01.12, 2006.01.13}

\IBVSTcomp{Uncatalogued star 236\arcs \hspace{1mm} NW of the variable}

\IBVSTchk{Uncatalogued fainter star 63\arcs \hspace{1mm} NW of the variable}

\IBVSTsysn

\IBVSTdata{Available at the IBVS website, after 2006.11.26}

\IBVSedata{5704-t1.txt}
\IBVSdataKey{5704-t1.txt}{BF Vel}{minima times}
\IBVSedata{5704-t2.txt}
\IBVSdataKey{5704-t2.txt}{BF Vel}{photometry}

\IBVSTtyp{ EA }

\IBVSTrem{Apparently, no suitable times of minima of BF Velorum have been obtained for an accurate period of the system to be calculated. Budding et al. (2004) give a value of 0.7040 day. The heights of the two maxima are unequal in the R and I bands. The secondary minimum is very shallow and deepens considerably at longer wavelengths, indicating a large temperature difference between the components. BF Vel is known to have a spectral type of A3+[G4IV].}

\IBVSTack{This research was included in the project for the support of research groups in the universities, co-funded by the European Social Fund (ESF) and National Resources (EPEAEK II) - {\it PYTHAGORAS}. This paper uses observations made at the South African Astronomical Observatory (SAAO).}

\IBVSfig{6.25cm}{5704-f1.eps}{14\arcm \ $\times$ 14\arcm \hspace{1.2mm} finding chart with the comparison (C) and check (K) stars marked; BF Vel is marked with a V.}
\IBVSfigKey{5704-f1.eps}{BF Vel}{finding chart}

\IBVSfig{8.55cm}{5704-f2.eps}{The complete $B$ (upper) and $V$ (lower) light curves of BF Vel.}
\IBVSfigKey{5704-f2.eps}{BF Vel}{light curve}

\IBVSfig{8.55cm}{5704-f3.eps}{The complete $R$ (upper) and $I$ (lower) light curves of BF Vel.}
\IBVSfigKey{5704-f3.eps}{BF Vel}{light curve}

\reference

Budding, E., Erdem, A., \c{C}i\c{c}ek, C., Bulut, I., Soydugan, F., Soydugan, E., Bakis, V.; Demircan, O., 2004, {\it A\& A}, {\bf 417}, 263.


\end{document}
