A NEW METHOD TO IDENTIFY NEARBY, YOUNG, LOW-MASS STARS

被引：78

作者：

Rodriguez, David R. ^{[1
]}

Bessell, M. S. ^{[2
]}

Zuckerman, B. ^{[1
]}

Kastner, Joel H. ^{[3
]}

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] Australian Natl Univ, Weston, ACT 2611, Australia

[3] Rochester Inst Technol, Ctr Imaging Sci, Rochester, NY 14623 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 727卷 / 02期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

open clusters and associations: individual (Lower Centaurus Crux; Upper Centaurus Lupus; TW Hydrae); stars: evolution; stars: pre-main sequence; ultraviolet: stars; X-RAY; M-DWARFS; BROWN DWARFS; H-ALPHA; CATALOG; EMISSION; IDENTIFICATION; ASSOCIATIONS; ACCRETION; TAURUS;

D O I：

10.1088/0004-637X/727/2/62

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe a new method to identify young, late-type stars within similar to 150 pc of the Earth that employs visual or near-infrared (NIR) data and the GALEX GR4/5 database. For spectral types later than K5, we demonstrate that the ratio of GALEX near-ultraviolet to visual and NIR emission is larger for stars with ages between 10 and 100 Myr than for older, main-sequence stars. A search in regions of the sky encompassing the TW Hya and Scorpius-Centaurus Associations has returned 54 high-quality candidates for follow up. Spectroscopic observations of 24 of these M1-M5 objects reveal Li 6708 angstrom absorption in at least 17 systems. Because GALEX surveys have covered a significant fraction of the sky, this methodology should prove valuable for future young star studies.

引用

页数：10