High-resolution spectroscopy of some very active southern stars

被引：43
|
作者：
Soderblom, DR
King, JR
Henry, TJ
机构：
[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
来源：
ASTRONOMICAL JOURNAL | 1998年 / 116卷 / 01期
关键词：
binaries : spectroscopic; stars : abundances; stars : chromospheres; stars : kinematics; stars : late-type; stars : rotation;
D O I：
10.1086/300423
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have obtained high-resolution echelle spectra of 18 solar-type stars that an earlier survey showed to have very high levels of Ca II H and K emission. Most of these stars belong to close binary systems, but five remain as probable single stars or well-separated binaries that are younger than the Pleiades on the basis of their lithium abundances and Ha emission. Three of these probable single stars also lie more than 1 mag above the main sequence in a color-magnitude diagram, and appear to have ages of 10 to 15 Myr. Two of them, HD 202917 and HD 222259, also appear to have a kinematic association with the pre-main-sequence multiple system HD 98800.
引用
收藏
页码：396 / 413
页数：18
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