The Binary Nature of the Subgiant CH Stars | Zendy

R. D. McClure | Zendy

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The Binary Nature of the Subgiant CH Stars

Author(s) -

R. D. McClure

Publication year - 1997

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/133910

Subject(s) - subgiant , stars , physics , astrophysics , giant star , binary star , asymptotic giant branch , radial velocity , red giant , k type main sequence star , orbital elements , astronomy , t tauri star , globular cluster

Repeated radial velocities have been measured for a sample of 10 subgiant CH(sgCH) stars over a period of about 15 years. Long-term velocity variations areexhibited by all but one star, and spectroscopic orbits have been calculatedfor six of them. The periods are long, ranging from 876 to 4144 days. Thedistribution of eccentricities and mass functions for sgCH star orbits aresimilar to those for giant barium and CH stars, exhibiting significant orbitaldissipation relative to normal late-type binaries. It is concluded that allsgCH stars are binaries, and like the barium and CH stars, they have had masstransferred from a former asymptotic giant-branch star.

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