A spectroscopic and photometric study of FK Comae in 1989

Details A spectroscopic and photometric study of FK Comae in 1989 A spectroscopic and photometric study of FK Comae in 1989

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..316h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 1, p. 316-327.

Astronomy and Astrophysics

Astrophysics

35

Binary Stars, G Stars, Giant Stars, Stellar Spectrophotometry, Balmer Series, Charge Coupled Devices, Iue, Photosphere, Starspots, Stellar Atmospheres, Stellar Rotation

Scientific paper

Results of an observational campaign, coordinated between visual photometry, optical spectroscopy, and UV spectroscopy, to elucidate the characteristics of FK Comae are presented. The photometry showed complicated but systematic behavior. Photospheric absorption lines were distorted by a Doppler-shifted bump caused by dark starspots resulting in small apparent radial velocity variations. No radial velocity variations characteristic of orbital motion were seen to a level of 3 km/s. Broad emission in H-alpha was modulated at the photospheric rotational amplitude, implying an origin no farther from the rotational axis than 1 stellar radius. The strengths of Ca II lines are modulated in phase with H-alpha but do not have velocity-modulated wings like H-alpha.

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