Classical T Tauri Stars and Substellar Analogs

Details Classical T Tauri Stars and Substellar Analogs Classical T Tauri Stars and Substellar Analogs

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.292..665b&link_type=abstract

Astrophysics and Space Science, v. 292, Issue 1, p. 665-672 (2004).

Astronomy and Astrophysics

Astrophysics

1

Classical T Tauri, Brown Dwarfs

Scientific paper

We propose a spectroscopic criterion based on Hα 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 Hα flux is stronger than the saturation limit at Log {Lum(Hα)/Lum(bol)} = -3.3. Additional criteria, such as the relation between HeI5876 or HeI6678 and Hα, 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 Msolar, which belong to nearby star forming regions and the TW Hya association.

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