After the Flare: The Perplexing Spectrum of FK Com

Details After the Flare: The Perplexing Spectrum of FK Com After the Flare: The Perplexing Spectrum of FK Com

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..952b&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

3

Fk Com, Hd 117555, Chandra, Corona, X-Ray

Scientific paper

FK Com, whose peculiarities were first noted by Merrill (1948), is a single G-type giant rotating near the breakup velocity (v sin i = 162.5 km s-1; see Huenemoerder et al. 1993). The angular momentum derived from this rapid rotation, which corresponds to a period of 2.4 days (Chugainov 1976), exceeds that possible for a main sequence progenitor, and there is no detected orbital motion, so the hypothesis has been advanced that FK Com is in fact a recently coalesced binary (see, e.g. Ramsey et al. 1981, Huenemoerder et al. 1993). FK Com thus provides a unique laboratory in which to study the stellar dynamo under extreme conditions in a single star, independent of interactions due to a binary companion. In this paper, we discuss recent Chandra HETG observations of this unusual object.

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