Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...116...27v&link_type=abstract
Astronomy and Astrophysics, vol. 116, no. 1, Dec. 1982, p. 27-34.
Astronomy and Astrophysics
Astrophysics
26
Angular Momentum, Binary Stars, Stellar Evolution, Stellar Spectra, A Stars, Chemical Composition, Main Sequence Stars, Radial Velocity, Stellar Mass
Scientific paper
The masses, radii, spectral types, and total specific angular momenta of the primary components of 47 W UMa contact binaries are estimated from the observed system spectral types and from an empirical spectral type-mass relation. The binaries examined include 25 W-type and 22 A-type systems. The absolute lifetimes of the primaries and their fractional lifetimes with respect to the time required for crossing the main-sequence band are determined by finding the positions of the primaries in theoretical evolutionary sequences for single stars. A further subdivision of the classical A- and W-type groups is discovered in which each subclass corresponds to a characteristic origin and evolutionary state.
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