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

页码：396 / 413

页数：18

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