期刊
ASTRONOMICAL JOURNAL
卷 130, 期 2, 页码 789-793出版社
UNIV CHICAGO PRESS
DOI: 10.1086/430458
关键词
binaries : close; Cepheids; stars : evolution; stars : fundamental parameters
We have obtained a Hubble Space Telescope STIS ultraviolet high-dispersion echelle-mode spectrum of the binary companion of the double-mode classical Cepheid Y Car. The velocity measured for the hot companion from this spectrum is very different from reasonable predictions for binary motion, implying that the companion is itself a short-period binary. The measured velocity changed by 7 km s(-1) during the 4 days between two segments of the observation, confirming this interpretation. We summarize binary'' Cepheids that are in fact members of a triple system and find that at least 44% are triples. The summary of information on Cepheids with orbits makes it likely that the fraction is underestimated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据