Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194..651s&link_type=abstract
Astrophysical Journal, vol. 194, Dec. 15, 1974, pt. 1, p. 651-655.
Astronomy and Astrophysics
Astrophysics
71
Apsides, Astronomical Models, Binary Stars, Main Sequence Stars, Stellar Atmospheres, Atmospheric Models, Nuclear Fusion, Opacity, Stellar Evolution, Stellar Rotation
Scientific paper
Apsidal-motion constants, k2, have been determined for models of homogeneous main-sequence stars constructed with the new 'Thomas-Fermi' opacities of Carson. These models are similar to those constructed with the 'hydrogenic' opacities of Cox and Stewart up to about 7 solar masses, but yield smaller values of k2 at higher masses. Nevertheless, the new theoretical constants are still systematically too large compared with most of the empirical constants known for members of well-observed binary systems. Uniform rotation is found to lower the theoretical constants only slightly. The effect of normal evolution during core hydrogen burning, however, produces good detailed agreement with observations. The primary of alpha Vir is probably evolving normally if Carson's opacities are adopted.
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