Absolute properties of the binary system BB Pegasi

Details Absolute properties of the binary system BB Pegasi Absolute properties of the binary system BB Pegasi

2007-05-14

arxiv.org/abs/0705.1810v1

Astron.J.134:642-647,2007

Astronomy and Astrophysics

Astrophysics

17 pages, 3 figures, accepted for Astronomical Journal

Scientific paper

10.1086/519493

We present a ground based photometry of the low-temperature contact binary BB Peg. We collected all times of mid-eclipses available in literature and combined them with those obtained in this study. Analyses of the data indicate a period increase of 3.0(1) x 10^{-8} days/yr. This period increase of BB Peg can be interpreted in terms of the mass transfer 2.4 x 10^{-8} Ms yr^{-1} from the less massive to the more massive component. The physical parameters have been determined as Mc = 1.42 Ms, Mh = 0.53 Ms, Rc = 1.29 Rs, Rh = 0.83 Rs, Lc = 1.86 Ls, and Lh = 0.94 Ls through simultaneous solution of light and of the radial velocity curves. The orbital parameters of the third body, that orbits the contact system in an eccentric orbit, were obtained from the period variation analysis. The system is compared to the similar binaries in the Hertzsprung-Russell and Mass-Radius diagram.

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