Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193...79r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 193, Oct. 1980, p. 79-86.
Astronomy and Astrophysics
Astronomy
55
Astrometry, Binary Stars, Stellar Envelopes, Stellar Gravitation, Albedo, Bolometers, Light Curve, Radiative Heat Transfer, Stellar Temperature
Scientific paper
Observationally determined values for the gravity darkening exponent (g) and the bolometric albedo (A) which were obtained from analyses of 31 close binary systems and display a wide range of system geometries and stellar temperatures are examined using the Wilson-Devinney model. Stars with radiative envelopes are found to have an average value of g(rad) = 0.96 and an average value of A(rad) = 1.02, whereas stars with convective envelopes have an average value of g(conv) = 0.31 and an average value of A(conv) = 0.56. In addition, a subgroup composed only of A- and W-type W UMa systems is analyzed showing that the A-types possess a slightly lower average value of g(A) = 0.28. The W-type binaries exhibit an average value of g(W) = 0.37 and a temperature differential of several hundred degrees, with the secondary being the hotter component.
Rafert Bruce J.
Twigg Laurence W.
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