Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238..657c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, May 15, 1989, p. 657-674.
Astronomy and Astrophysics
Astronomy
101
Cool Stars, H Alpha Line, Main Sequence Stars, Stellar Rotation, Variable Stars, Angular Momentum, Molecular Clouds, Stellar Envelopes, Stellar Magnetic Fields
Scientific paper
Time resolved H-alpha spectra of AB Doradus are presented that confirm a model in which large prominence-like condensations of neutral material are trapped in corotation with the stellar magnetic field. The results suggest that the entire confining field is deformed outward by the increasing centrifugal force acting on the corotating cloud materials as the cloud density increases. The angular momentum loss rate from the cloud ejections is shown to be sufficient to brake the rotation of the star's convective envelope on a time-scale of no more than 10 to the 8th yr.
Collier Cameron Andrew
Robinson Richard D.
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