Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...74..551a&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 74, Oct. 1990, p. 551-573.
Astronomy and Astrophysics
Astrophysics
75
B Stars, Binary Stars, Main Sequence Stars, Star Formation, Stellar Mass, Stellar Orbits, Stellar Spectra
Scientific paper
Twenty coude spectra were obtained for each of the 74 B2-B5 IV or V stars, and the results of their radial velocities were combined with those of a previous study of 42 similar stars, to examine the frequency and the formation mechanism of these binaries. New improved orbital elements are listed for nine known double-lined and 26 single-lined spectroscopic binaries. It is found that, systems with periods of 0.01 yr to 100,000 yrs, have secondary frequencies that fit the Salpeter (1955) luminosity function (but not the van Rhijn function), indicating that these systems were formed primarily by capture. For systems with periods shorter than 0.01 yr, the separations of components are only a few stellar radii, suggesting that these systems have undergone mass transfer; their secondary masses have no direct information concerning the formation mechanism.
Abt Helmut A.
Gomez Ana E.
Levy Saul G.
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