Abstract
view Abstract Citations (69) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The enigmatic Half line of FK COM : last stages of a coalescing binary ? Walter, F. M. ; Basri, G. S. Abstract The apparently single, rapidly rotating G giant FK Comae displays an unusual hydrogen alpha emission line which is very broad, strong, and variable. Extensive high-resolution studies of this line with complete phase coverage are presented. The alpha hydrogen emission centroid shows a radial velocity modulation on the 2.4 days stellar rotation period with a semiamplitude identical to the photospheric rotational velocity. These data, when phased with optical photometry, indicate that the star has a bright, rather than dark, region on its surface and that the phase may have been stable for seven years. A qualitative model wherein the bright spot is caused by accretion from a low mass unseen companion onto the surface of the G giant is considered. Such a model explains many of the observed characteristics of the stellar spectrum and hydrogen alpha feature, and it is concluded that FK Comae is not yet a single star, but is still evolving toward coalescence of the system. Publication: The Astrophysical Journal Pub Date: September 1982 DOI: 10.1086/160293 Bibcode: 1982ApJ...260..735W Keywords: Binary Stars; Emission Spectra; G Stars; H Alpha Line; Stellar Evolution; Stellar Spectra; Stellar Spectrophotometry; High Resolution; Photosphere; Radial Velocity; Radiant Flux Density; Spectral Line Width; Spectral Resolution; Stellar Mass Accretion; Stellar Models; Stellar Rotation; Visual Photometry; Astrophysics full text sources ADS | data products SIMBAD (1)
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