Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..172d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 172-184.
Astronomy and Astrophysics
Astrophysics
25
Early Stars, Late Stars, Orion Nebula, Stellar Convection, Stellar Rotation, Angular Momentum, Binary Stars, Pleiades Cluster
Scientific paper
The evolution of rotation on approach to the main sequence (MS) is studied in about 50 stars in the Orion Nebula region with V = 12-14, B-V = 0.6-1.2. The observed distribution of v sin i shows a range from less than 15 km/s to about 50 km/s. A wide range of v sin i is present at all evolutionary phases, and this apparently can be traced back to the conditions of star formation. The data contradict the suggestion that all late-type stars go through a brief phase of extremely rapid rotation when they first arrive on the MS. If the observed distribution of v sin i is evolved to the MS with moderate angular momentum loss which is not strongly dependent on rotation velocity, the distribution observed among Pleiades K stars and G and K stars of the Alpha Perseus cluster is reproduced. The data support the suggestion that angular momentum loss to due to stellar winds brakes the convection zone more than the interior, so that solid-body rotation is not maintained.
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