Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..275h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 275-293.
Astronomy and Astrophysics
Astrophysics
301
Angular Momentum, Pre-Main Sequence Stars, Radial Velocity, Stellar Evolution, Stellar Rotation, T Tauri Stars, Gravitational Collapse, H Alpha Line, Molecular Clouds, Orion Nebula, Taurus Constellation
Scientific paper
The authors report rotational and radial velocities for 50 T Tauri stars in the Taurus-Auriga and Orion complexes. They confirm and extend the finding of Vogel and Kuhi that most T Tauri stars are slow rotators, with rotation an order of magnitude or more below breakup velocity. About 30% of the 0.5 - 1.0 M_sun; stars in Taurus-Auriga have rotational velocities at or below the detection limit of 10 km s-1; half have v sin i values between 10 and 15 km s-1. These observed low rotation rates show that low-mass stars have lost most of the angular momentum of their parent interstellar clouds by the time they first appear optically. This substantial loss must occur either during protostellar collapse or within ≡105yr after its cessation. There is no correlation between Hα emission and rotation among low-mass T Tauri stars, suggesting that T Tauri activity may not be driven by a solar-type magnetic dynamo.
Hartmann Lee
Hewett Robert
Mathieu Robert D.
Stahler Steven
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