The early-type semidetached binary system V716 Centaurus

Details The early-type semidetached binary system V716 Centaurus The early-type semidetached binary system V716 Centaurus

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.385..381b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 385, Issue 1, pp. 381-390.

Astronomy and Astrophysics

Astronomy

2

Binaries: Eclipsing, Stars: Early-Type, Stars: Emission-Line, Be, Stars: Fundamental Parameters, Stars: Individual: V716 Cen

Scientific paper

New high-resolution spectra of V716 Cen revealed for the first time lines of the secondary component and its radial velocities. The simultaneous solution of the new radial velocity curves and the Hipparcos light curve yield the reliable absolute dimensions of this semidetached system. The masses for the primary and secondary are M1 = 5.68 +/- 0.07Msolar and M2 = 2.39 +/- 0.05Msolar, respectively, and the radii are R1 = 4.08 +/- 0.07Rsolar and R2 = 3.36 +/- 0.02Rsolar. We derive also effective temperatures of Teff1 = 15500 +/- 50 K and Teff2 = 9000 +/- 80 K, and equatorial rotational velocities of vrot sini = 137 +/- 2 km s-1 and vrot sini = 116 +/- 7 km s-1. These rotational velocities imply that the components rotate synchronously. The distance to the system is d = 339 +/- 8 pc, in good agreement with the less accurate Hipparcos distance (337 +/- 72 pc). The primary is underluminous and the secondary overluminous compared to normal main-sequence stars of the same mass. This implies that the secondary component of the semidetached system is in slow mass transferring stage after mass ratio reversal, although the Hα-line profiles do not show clear evidence for this.

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