Studies of early-type variable stars. I - The ellipsoidal and Beta Cephei variable HD 149881 /V 600 Her/

Details Studies of early-type variable stars. I - The ellipsoidal and Beta Cephei variable HD 149881 /V 600 Her/ Studies of early-type variable stars. I - The ellipsoidal and Beta Cephei variable HD 149881 /V 600 Her/

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....51....1h&link_type=abstract

Astronomy and Astrophysics, vol. 51, no. 1, Aug. 1976, p. 1-7.

Astronomy and Astrophysics

Astrophysics

8

Astronomical Spectroscopy, Binary Stars, Early Stars, Variable Stars, Brightness Temperature, Light Curve, Orbital Elements, Radial Velocity, Stellar Evolution, Stellar Spectrophotometry, Velocity Distribution

Scientific paper

Fifty years of spectroscopic data are used to determine an orbit for the ellipsoidal variable HD 149881 (V 600 Her). It is shown that this star is actually a spectroscopic binary with a period of 5.20 days and velocity variations characteristic of Beta Cephei variables. The light curve and orbital data are combined to derive the orbital and physical parameters of the system. For an assumed primary mass of 15 solar masses, the following parameters are obtained: an orbital inclination of 35 deg, a surface gravity of log g = 3.26, a primary radius of 15 solar radii, a secondary mass of two solar masses, a bolometric magnitude (for the whole system) of -8.1, an absolute visual magnitude of -5.4, and a spectral type (for the primary) of B0.5 III. The evolutionary state of Beta Cephei stars is reviewed, noting that such stars are probably near the end of hydrogen exhaustion.

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