The many faces of F stars - A rotational modulation study of Capella, Procyon, and Caph with the International Ultraviolet Explorer
1991; IOP Publishing; Volume: 375; Linguagem: Inglês
10.1086/170236
ISSN1538-4357
Autores Tópico(s)Astronomy and Astrophysical Research
Resumoview Abstract Citations (25) References (53) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Many Faces of F Stars: A Rotational Modulation Study of Capella, Procyon, and Caph with the International Ultraviolet Explorer Ayres, Thomas R. Abstract Far-UV spectroscopy of the F stars Capella, Procyon, and Caph is reported. Although all three stars are regard as chromospherically 'active', none exhibited any sensible rotational modulations, indicating a smooth surface distribution of chromospheric emission. Balancing this nonsolar behavior are a variety of puzzling differences among the three stars. On the one hand, the C IV features of Procyon are narrow, while that of the Capella secondary and Caph are broad; differences in v sin i alone cannot explain the dichotomy. On the other hand, the high-excitation emissions of the Capella secondary and Procyon, but not Caph, exhibit statistically significant redshifts. The significance of these results is discussed in the light of the speculation by Simon and Drake (1989) that the X-ray deficient coronae of the early F dwarfs are produced by classical acoustic heating. Publication: The Astrophysical Journal Pub Date: July 1991 DOI: 10.1086/170236 Bibcode: 1991ApJ...375..704A Keywords: Chromosphere; F Stars; Iue; Stellar Rotation; Stellar Spectra; Emission Spectra; Line Spectra; Astrophysics full text sources ADS | data products SIMBAD (3) MAST (1) INES (1)
Referência(s)