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A spectroscopic and photometric study of FK Comae in 1989Results 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.
Document ID
19930041432
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Huenemoerder, David P.
(JPL Pasadena, CA, United States)
Ramsey, Lawrence W.
(Pennsylvania State Univ. University Park, United States)
Buzasi, Derek L.
(Johns Hopkins Univ. Baltimore, MD; NASA, Washington, United States)
Nations, Harold L.
(Villanova Univ. PA, United States)
Date Acquired
August 16, 2013
Publication Date
February 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 404
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A25429
Funding Number(s)
CONTRACT_GRANT: NAG5-563
CONTRACT_GRANT: NSF AST-89-19205
Distribution Limits
Public
Copyright
Other

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