Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130..324b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 2, Jan. 1984, p. 324-330.
Astronomy and Astrophysics
Astrophysics
12
B Stars, Binary Stars, Mass Transfer, Stellar Evolution, Stellar Mass, Angular Momentum, Stellar Envelopes
Scientific paper
A possible source for the W UMa binaries is described in terms of a Case B type process of mass transfer between components, for which the original mass ratio is quite small (less than about 0.2). The slow stage of the Case B process is concentrated on and discussed by means of a simplified analytical representation, which reduces, essentially, to a pair of simultaneous ordinary differential equations. The progress of the resulting common envelope phase is studied by reference to a number of parameters, including some involved in braking mechanisms, which get rid of a certain proportion of orbital angular momentum. Many observed features of W UMa systems seem able to be broadly accounted for in the scheme, which requires that a large proportion (about 10 percent) of seemingly single intermediate mass stars should actually be attended, not too distantly, by low mass companions.
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