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

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

2009-09-23

arxiv.org/abs/0909.4327v1

Publ.Astron.Soc.Austral.26:372-378,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 5 figures, Gallino Birthday Workshop

Scientific paper

10.1071/AS08034

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 Gruis 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.

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