HW Virginis - A short period eclipsing binary containing an sdB star

Details HW Virginis - A short period eclipsing binary containing an sdB star HW Virginis - A short period eclipsing binary containing an sdB star

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..103w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 1, p. 103-112.

Astronomy and Astrophysics

Astronomy

48

Eclipsing Binary Stars, Light Curve, Stellar Mass, Stellar Orbits, Stellar Spectrophotometry, Stellar Temperature, Subdwarf Stars, Angular Momentum, Cataclysmic Variables, Curve Fitting, Distance, Radii, Roche Limit, Stellar Gravitation, Stellar Mass Accretion

Scientific paper

Simultaneous photometry of the binary star HW Vir, a detached system with an orbital period of 2 h 48 min is described. The new UBVR light curves obtained using the Wilson-Devinney code are found to constrain the orbital inclination of the system within the narrow range of 80.6 +/-0.2 deg. The temperature of the primary star is between 29,000 and 36,000 K, and the temperature of the secondary star is near 3,700 K. The possible masses and radii of the two stars are calculated using the published amplitude of the radial velocity curve of the primary star, 87.9 +/-4.8 km/s. It is found that, for the primary star log g1 is greater than 4.8 and less than or equal to 5.8. From the temperature and gravity of the primary star, its distance is found to be in the range between 42 and 151 pc. It is suggested that the system will begin mass transfer when the orbital period has decreased enough to bring the secondary star into contact with its Roche lobe.

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