Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..360c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 2, Sept. 15, 1992, p. 360-370. Research suppor
Astronomy and Astrophysics
Astronomy
40
Dwarf Stars, G Stars, Open Clusters, Stellar Coronas, Stellar Magnetic Fields, Corotation, Stellar Envelopes, Stellar Rotation, Taylor Instability
Scientific paper
Evidence is found for prominence-like circumstellar material in four rapidly rotating G-K dwarfs of the Alpha Persei cluster, He 373, 520, 622 and 699. The present time-series H-alpha spectra of these stars show transient absorption features similar to those seen in the southern field rapid rotator AB Doradus. The absorption transients have durations of order 1 hr, during which they drift across the rotationally broadened H-alpha profiles of the stars concerned. This behavior is consistent with the model developed for AB Dor, in which the absorption transients are produced via scattering of H-alpha photons in clouds of mainly neutral material trapped in the summits of closed magnetic field structures extending several stellar radii above the surface of the star. The radial accelerations of several of the most clearly defined transients in the four stars observed were measured. The radial accelerations of these transient absorption features as a function of stellar equatorial rotation speed indicate that, as in AB Dor, the clouds are located preferentially just outside the Keplerian corotation radius.
Collier Cameron Andrew
Woods John A.
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