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Title:
The FK Comae stars
Authors:
Bopp, B. W.; Stencel, R. E.
Affiliation:
AA(Joint Institute for Laboratory Astrophysics, Boulder, CO), AB(Joint Institute for Laboratory Astrophysics, Boulder, CO)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 247, Aug. 1, 1981, p. L131-L134. (ApJL Homepage)
Publication Date:
08/1981
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Binary Stars, Chromosphere, Giant Stars, K Stars, Stellar Evolution, Stellar Rotation, Stellar Spectra, Emission Spectra, G Stars, Iue, Line Spectra, Radial Velocity, Spectrum Analysis, Stellar Coronas, Ultraviolet Spectra
DOI:
10.1086/183606
Bibliographic Code:
1981ApJ...247L.131B

Abstract

The paper presents IUE observations of three very rapidly rotating G-K giants (v sin i = 100 km/s). The UV spectra show strong chromospheric and transition region emission lines similar to (and in excess of) the RS CVn binaries. These stars show no evidence for radial velocity variations in excess of plus or minus 3 to plus or minus 20 km/s, arguing against duplicity. As a class, they lend support to the rotation-activity hypothesis. Coalesced W UMa binaries, rather than single stars, are the possible progenitors for these FK Com variables.

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