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.
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页数：10
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