Evolutionary scenarios for intermediate-mass stars in close binaries

Abstract

view Abstract Citations (122) References (61) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evolutionary Scenarios for Intermediate-Mass Stars in Close Binaries Iben, Icko, Jr. ; Tutukov, Alexander V. Abstract 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. Publication: The Astrophysical Journal Pub Date: February 1987 DOI: 10.1086/165011 Bibcode: 1987ApJ...313..727I Keywords: Astrophysics; Binary Stars; Mass Transfer; Stellar Evolution; Dwarf Stars; Helium; Roche Limit; Stellar Envelopes; Stellar Mass; Stellar Mass Accretion; Stellar Mass Ejection; Astrophysics; STARS: BINARIES; STARS: EVOLUTION full text sources ADS | data products SIMBAD (1)