Regular variations in the H-alpha profile of FK Comae
1981; IOP Publishing; Volume: 251; Linguagem: Inglês
10.1086/183702
ISSN1538-4357
AutoresLawrence W. Ramsey, Samuel C. Barden, H. L. Nations,
Tópico(s)Nuclear physics research studies
Resumoview Abstract Citations (41) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Regular variations in the alf profile of FK Com. Ramsey, L. W. ; Nations, H. L. ; Barden, S. C. Abstract A series of observations of the rapidly rotating G type giant FK Comae are presented. The unusually broad H-alpha profile is seen to vary regularly in the sense that the violet-to-red emission ratio is correlated with photometric phase and presumably with rotation. These observations are described by an excretion disk model with substantial density inhomogeneities driven at the angular velocity of the star by an imbedded magnetic field. That sufficient magnetic flux is available is suggested by both the high observed v sin i of about 120 km/s and photometric evidence of starspots. Publication: The Astrophysical Journal Pub Date: December 1981 DOI: 10.1086/183702 Bibcode: 1981ApJ...251L.101R Keywords: Giant Stars; H Alpha Line; Spectral Line Width; Stellar Rotation; Stellar Spectra; Variable Stars; Angular Velocity; G Stars; Late Stars; Magnetic Flux; Spectral Resolution; Stellar Spectrophotometry; Astronomy full text sources ADS | data products SIMBAD (1)
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