A flare event in the peculiar giant FK Comae

Details A flare event in the peculiar giant FK Comae A flare event in the peculiar giant FK Comae

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982saosr.392a.225r&link_type=abstract

In Smithsonian Astrophysics Observatory 2nd Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, Vol. 1 p 225-230 (

Astronomy and Astrophysics

Astrophysics

1

Angular Velocity, Binary Stars, Periodic Variations, Red Shift, Stellar Flares, Variable Stars, Emission Spectra, Magnetic Fields, Spectroscopy

Scientific paper

Observations are presented of a very energetic flare event in the peculiar rapidly rotating star FK Comae. During this event on June 18th 1981 the usual asymmetrical double peaked H alpha emission feature with an equivalent width (EW) approx 3-4 A changed to a broad emission feature with EW approx 13 A. Sixteen spectra were obtained over 2 hours. Some changes in the emission profile are apparent on this time scale. The following night the enhanced emission persisted but at lower levels and it was substantially redshifted. This event is interpreted in terms of a model where material is injected into a disk co-rotating with the angular velocity of the stellar surface. A localized region of surface activity is conjectured to be the source of the event.

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