2003A&A...398.1073C

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), M₁=2.40±0.01M_☉, R₁=2.64±0.01R_☉, M_bol1=0.66±0.04, T_eff1=9180±90K, and for the secondary (mass loser), M₂=0.68±0.01M_☉, R₂=3.76R_☉, M_bol2=2.40±0.08, T_eff2=5160±90K. The semi-major axis A of the relative orbit is 13.617±0.019R_☉. 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±17pc, and the colour excess E[B2-V1] as 0.220±0.014.