Classical T Tauri stars and substellar analogs

被引：1

作者：

Navascués, DH

Martín, EL

Jayawardhana, R

Mohanty, S

机构：

[1] INTA, LAEFF, Madrid, Spain

[2] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[3] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTROPHYSICS AND SPACE SCIENCE | 2004年 / 292卷 / 1-4期

关键词：

classical T Tauri; brown dwarfs;

D O I：

10.1023/B:ASTR.0000045073.12759.1f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We propose a spectroscopic criterion based on Halpha equivalent width and spectral type to classify classical T Tauri stars and substellar analogs. We argue that accreting objects can be identified from low-resolution optical spectroscopy, when their Halpha flux is stronger than the saturation limit at Log {Lum( Halpha)/Lum(bol)} = - 3.3. Additional criteria, such as the relation between HeI5876 or HeI6678 and Halpha, or the ratios between the components of the CaII infrared triplet, are also discussed. We have tested the reliability of these criteria by applying them to several objects with masses in the range 0.11 - 0.025 M-., which belong to nearby star forming regions and the TW Hya association.

引用

页码：665 / 672

页数：8

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