Roberto生日之际的几个双星谜题
A Few Binary Star Puzzles for Roberto on the Occasion of His Birthday
摘要：
在过去的16年中积累的径向速度观测被用来获得CEMP星CS 22881-036的初步轨道。速度幅值很小。在大致相同的时间间隔内观察到的另外三颗CEMP星没有发现速度变化。本文评述了两个CEMP双线分光双星和RR型天琴座TY Gruis的伴星的光谱学性质。盘状碳星双星的周期分布与它们的母体正常双星的周期分布之间的差异可以定性地归因于随着双星分离的增加，吸积质量的下降。最后讨论了未能找到CEMP星伴星的可能原因。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
