Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313..727i&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 15, 1987, p. 727-742.
Astronomy and Astrophysics
Astrophysics
94
Astrophysics, Binary Stars, Mass Transfer, Stellar Evolution, Dwarf Stars, Helium, Roche Limit, Stellar Envelopes, Stellar Mass, Stellar Mass Accretion, Stellar Mass Ejection
Scientific paper
The consequences are explored of assuming that, in common envelope events involving mass transfer in close binaries, the energy required to eject the envelope from the system is comparable with the change in orbital energy of the system. Situations in which the primary fills its Roche lobe for the first time (1) after it has exhausted central hydrogen, but before it has ignited helium, and (2) after it has already developed an electron-degenerate carbon-oxygen core are studied in detail. The properties of a system consisting of a CO degenerate dwarf and a helium star, with angular momentum loss due to gravitational wave radiation maintaining the helium star in Roche lobe contact, are explored. Finally, the formation frequency of non-Roche lobe filling helium stars with companions of various types is examined to see whether they could account for some fraction of observed sdB and sdO stars.
Iben Icko Jr.
Tutukov Alexander V.
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