Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..943h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Dec. 15, 1984, p. 943-951. Research supported by t
Astronomy and Astrophysics
Astronomy
14
Binary Stars, Early Stars, Radial Velocity, Stellar Evolution, Stellar Spectrophotometry, Variable Stars, Astrometry, B Stars, Circular Orbits, Light Curve, Mass To Light Ratios, Mass Transfer, O Stars, Orbital Elements, Ubv Spectra
Scientific paper
Radial velocities derived from 67 spectrograms obtained over a period of 37 yr at the DAO, Victoria, are presented. It is shown that the orbit is circular and of constant period and that the primary component is rotating synchronously. A mass ratio of 0.39±0.02 is derived and analysis of recently published light-curves using the synthesis code LIGHT confirms the semi-detached nature of the system. The final values of mass, radius and luminosity together with published uvbyβ photometry then indicate that the primary component might be expected to display β Cephei-type variability and therefore provide an explanation for the well-known asymmetries in the light-curves. The binary system belongs to a small group of short-period early-type semi-detached systems which have significantly different characteristics from classical Algol systems and are presumably the result of case A mass-exchange processes.
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