Duplicity of hot helium subdwarfs

Details Duplicity of hot helium subdwarfs Duplicity of hot helium subdwarfs

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67..109t&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Jan.-Feb. 1990, p. 109-114. In Russian.

Astronomy and Astrophysics

Astronomy

13

Binary Stars, Helium, Hot Stars, Stellar Evolution, Subdwarf Stars, Milky Way Galaxy, Planetary Nebulae, Stellar Mass, Stellar Orbits, White Dwarf Stars

Scientific paper

In the framework of the standard scenario for the evolution of medium-mass close binary systems, the initial masses, mass ratios, and orbits of the major axes are found for evolution leading to the formation of helium subdwarfs. The total birthrate of binary systems with subdwarfs in the Galaxy is about 0.0067/yr. The majority of single blue helium subdwarfs are produced by merging degenerate helium dwarfs. The birthrate of these subdwarfs is 0.029/yr. The theoretically estimated duplicity fraction of subdwarfs is about 0.2, a value that does not contradict the preliminary results from the observations of Saffer and Liebert (1988).

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