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A Few Binary Star Puzzles for Roberto on the Occasion of His Birthday

Published online by Cambridge University Press:  05 March 2013

George W. Preston
George W. Preston*
Affiliation:
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, California, USA. Email: [email protected]
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Abstract

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Radial-velocity observations accumulated during the past 16 years are used to derive a preliminary orbit for the CEMP star CS 22881–036. The velocity amplitude is very small. No velocity variation is found for three additional CEMP stars observed over roughly the same time interval. Searches for companions of two CEMP double-lined spectroscopic binaries and of the RR Lyrae star TY Gru are reviewed. A disparity between the period distribution of disk carbon-star binaries and that of their parent population of normal binaries can be attributed qualitatively to a decline in accreted mass with increasing binary separation. Finally, possible reasons for failure to find expected companions of CEMP stars are discussed.

Keywords

binaries: spectroscopicstars: carbonstars: evolution
Type
Observations
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 372 - 378
Copyright
Copyright © Astronomical Society of Australia 2009

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