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Title:
The binary nature of the barium stars
Authors:
McClure, R. D.; Fletcher, J. M.; Nemec, J. M.
Affiliation:
AA(Dominion Astrophysical Observatory, Victoria, British Columbia, Canada), AB(Dominion Astrophysical Observatory, Victoria, British Columbia, Canada), AC(Dominion Astrophysical Observatory, Victoria, British Columbia, Canada)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, May 15, 1980, p. L35-L38. (ApJL Homepage)
Publication Date:
05/1980
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
BARIUM, BINARY STARS, METALLIC STARS, STELLAR EVOLUTION, STELLAR SPECTRA, GLOBULAR CLUSTERS, RADIAL VELOCITY, STELLAR MASS
Comment:
A&AA ID. AAA027.117.045
DOI:
10.1086/183252
Bibliographic Code:
1980ApJ...238L..35M

Abstract

Radial-velocity spectrometer observations are presented that indicate that Ba II stars are binary systems. The secondary stars of these systems have low masses, consistent with their being degenerate objects which have lost mass onto their primaries in a previous stage of evolution. It is suggested that the Population II equivalents, the CH stars, may also be binary systems. This may be related to the fact that they are found only in globular clusters of the lowest central concentration.

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