EDP Sciences
Free access
Volume 398, Number 3, February II 2003
Page(s) 1073 - 1079
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20021728

A&A 398, 1073-1079 (2003)
DOI: 10.1051/0004-6361:20021728

Physical parameters of the Algol system BP Muscae from simultaneous analysis of GENEVA 7-colour light curves

F. Carrier, F. Barblan, G. Burki, P. Bartholdi and B. Nicolet

Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
(Received 3 September 2002/ Accepted 6 November 2002)

The semi-detached eclipsing binary system BP Muscae has been analysed using the Wilson-Devinney program. Light curves have been obtained in the GENEVA 7-colour photometric system, and radial velocity curves for both components have been measured with the spectrograph CORALIE. The physical and orbital parameters have been determined through a self-consistent simultaneous solution of light curves in seven colours and of the radial velocity curves of both components. The absolute elements of the components are, for the primary (mass gainer), $M_1 = 2.40 \pm 0.01~M_{\odot}$, $R_1 = 2.64 \pm 0.01~R_{\odot}$, $M_{\rm bol_1} = 0.66 \pm 0.04$, $T_{\rm eff_1} = 9180 \pm 90$ K, and for the secondary (mass loser), $M_2 = 0.68 \pm 0.01~M_{\odot}$, $R_2 = 3.76~R_{\odot}$, $M_{\rm bol_2} = 2.40 \pm 0.08$, $T_{\rm eff_2} = 5160 \pm 90$ K. The semi-major axis A of the relative orbit is $13.617 \pm 0.019~R_{\odot}$. The spectral type of the components are A0.5/1.5 V (primary) and about G5 III. The distance to BP Mus is evaluated as $562 \pm 17$ pc, and the colour excess E[B2-V1] as $0.220 \pm 0.014$.

Key words: stars: individual: BP Muscae -- stars: binaries: eclipsing -- stars: binaries: close -- stars: fundamental parameters -- techniques: photometric -- techniques: radial velocities

Offprint request: F. Carrier, Fabien.Carrier@obs.unige.ch

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