Late-type field stars in the RASS at high galactic latitude

被引：0

作者：

Zickgraf, FJ ^{[1
]}

Krautter, J ^{[1
]}

Frink, S ^{[1
]}

Alcalá, JM ^{[1
]}

Mujica, R ^{[1
]}

Covino, E ^{[1
]}

Sterzík, MF ^{[1
]}

机构：

[1] Hamburger Sternwarte, D-21029 Hamburg, Germany

来源：

Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Proceedings, Vols 1 and 2 | 2005年 / 560卷

关键词：

surveys; x-rays : stars; stars : late-type; stars : pre-main sequence;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results of an investigation on a high-galactic latitude sample of late-type field stars selected from the ROSAT All-Sky Survey (RASS). The sample comprises similar to 200 G, K, and M stars. Lithium abundances were determined for similar to 180 G-M stars. Radial velocities were measured for most of the similar to 140 G and K type stars. Combined with proper motions these data were used to study the age distribution and the kinematical properties of the sample. Based on the lithium abundances half of the G-K stars were found to be younger than the Hyades (660Myr). About 30% are comparable in age to the Pleiades (100 Myr). A small subsample of 10 stars is younger than the Pleiades (100Myr). They axe therefore most likely pre-main sequence stars. Kinematically the PMS and Pleiades-type stars appear to form a group with space velocities close to the Castor moving group but clearly distinct from the Local Association.

引用

页码：1047 / 1050

页数：4

共 16 条

[1] Identification of a complete sample of northern Rosat All-Sky Survey X-ray sources. III. The catalog [J].