Fast H-alpha variations on a rapidly rotating cool main sequence star. I - Circumstellar clouds

Details Fast H-alpha variations on a rapidly rotating cool main sequence star. I - Circumstellar clouds Fast H-alpha variations on a rapidly rotating cool main sequence star. I - Circumstellar clouds

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.236...57c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 236, Jan. 1, 1989, p. 57-87.

Astronomy and Astrophysics

Astronomy

134

Cool Stars, Dwarf Stars, H Alpha Line, Main Sequence Stars, Stellar Envelopes, Stellar Rotation, Absorption Spectra, Clouds, Radial Velocity, Stellar Coronas, Stellar Magnetic Fields

Scientific paper

High-resolution CCD spectra of the H-alpha profile of AB Doradus reveal transient absorption features whose radial velocities relative to the underlying stellar spectrum increase monotonically with time. It is proposed that these features originate in cool dense clouds embedded in and corotating with the hot extended corona. Such clouds could form through thermal instabilities at the summits of large magnetic loops.

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