Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..873h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 873-880. Research supported by the Smithsonian Institution.
Astronomy and Astrophysics
Astronomy
116
Accretion Disks, Molecular Clouds, Pre-Main Sequence Stars, Stellar Rotation, T Tauri Stars, Angular Velocity, Charge Coupled Devices, Continuous Radiation, Star Formation, Stellar Envelopes, Stellar Winds
Scientific paper
New rotational-velocity measurements for pre-main-sequence stars in the Taurus-Auriga molecular cloud are reported. Rotational velocities or upper limits of 10 km/s are now available for 90 percent of the T Tauri stars with V less than 14.7 in the catalog of Cohen and Kuhi. Measurements of 'continuum emission' stars, thought to be accreting high-angular-momentum material from a circumstellar disk, show that these objects are not especially rapid rotators. The results confirm earlier findings that angular-momentum loss proceeds very efficiently in the earliest stages of star formation, and suggest that stars older than about one million yr contract to the main sequence at nearly constant angular momentum. The slow rotation of T Tauri stars probably requires substantial angular-momentum loss via a magnetically coupled wind.
Hartmann Lee
Stauffer Joh R.
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