Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..467a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 1, 1988, p. 467-476.
Astronomy and Astrophysics
Astrophysics
31
Binary Stars, Spectrum Analysis, Stellar Radiation, Stellar Spectra, Ultraviolet Spectra, B Stars, Giant Stars, Helium, Iue, Open Clusters
Scientific paper
Phase-resolved observations of Capella (α Aurigae A: G5 III+G0 III) were conducted with the IUE in order to separate the spectrum of the core-helium-burning (CHeB) primary (Aa) from that of the fast-rotating, chromospherically active secondary (Ab). The ultraviolet emissions of the primary were compared to those of the four K0 giants of the Hyades and the field K giants β Cet and β Gem. In terms of C IV emission, the six reference CHeB giants fall into two distinct groups: the more active β Cet type; and the less active β Gem type. Capella Aa clearly belongs in the β Cet group. The similarity between the Capella primary and the two active Hyads - γ Tauri and θ1 Tauri - is striking. If Capella truly is coeval with the Hyades nucleus, then the age of the cluster might be less than half that commonly assumed. The UV spectra of the Capella secondary show evidence of mass outflow in the upper chromosphere, although the flow very likely is part of a circulation system like that thought to operate in magnetic active regions on the Sun.
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