Optical Spectroscopy of Embedded Young Stars in the Taurus-Auriga Molecular Cloud
Abstract
This paper describes the first optical spectroscopic survey of class I sources (also known as embedded sources and protostars) in the Taurus-Auriga dark cloud. We detect 10 of the 24 known class I sources in the cloud at 5500-9000 A. All detected class I sources have strong H-alpha emission; most also have strong [O I] and [S II] emission. These data - together with high quality optical spectra of T Tauri stars in the Taurus-Auriga cloud - demonstrate that forbidden emission lines are stronger and more common in class I sources than in T Tauri stars. Our results also provide a clear discriminant in the frequency of forbidden line emission between weak-emission and classical T Tauri stars. In addition to strong emission lines, three class I sources have prominent TiO absorption bands. The M-type central stars of these sources mingle with optically visible T Tauri stars in the HR diagram and lie somewhat below both the birthline for spherical accretion and the deuterium burning sequence for disc accretion.
Keywords
Cite
@article{arxiv.astro-ph/9804184,
title = {Optical Spectroscopy of Embedded Young Stars in the Taurus-Auriga Molecular Cloud},
author = {Scott J. Kenyon and David I. Brown and Chris Tout and Perry Berlind},
journal= {arXiv preprint arXiv:astro-ph/9804184},
year = {2009}
}
Comments
19 pages of text, 4 pages of tables, and 10 pages of figures