Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..391d&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 391-395 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Cometary Atmospheres, Giant Stars, Iue, Spectrophotometry, Ultraviolet Spectroscopy, Astronomical Spectroscopy, Chromosphere, Eclipsing Binary Stars, Radial Velocity, Stellar Models, Ultraviolet Astronomy, Variable Stars
Scientific paper
The FK Comae is a rapidly rotating approx. G5 giant which has very strong and variable chromospheric and transition region line emissions, similar in number and strength to those observed for the most active RS CVn stars. It is also a variable star which has low amplitude, quasisinusoidal light variations with period of approx. 2.40 days. As in the case of RS CVn variables, these light variations were modelled with dark star spots. In addition, energetic flare-like events were observed spectroscopically and photometrically. Radial velocity observations fail to reveal that FK Comae is a close binary system which could account for its rapid rotation through tidal synchronization. Since radial velocity observations have failed so far to reveal any evidence that FK Comae is a close binary, it is suggested that the star was once a binary system that now has coalesced into a single, rapidly rotating star. The evolutionary models of Webbink (1976) suggest that W Ursae Majoris binaries coalesce after going through the contact stage of their evolution. It is also suggested that the very broad H-alpha feature observed in FK Comae originates in the excretion disk expected in Webbink's scheme.
Dorren David J.
Guinan Edward F.
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