Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..480m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 480-488.
Astronomy and Astrophysics
Astrophysics
47
Dwarf Stars, K Stars, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Spectrophotometry, Absorption Spectra, G Stars, Infrared Spectra, Line Spectra, Stellar Rotation, Zeeman Effect
Scientific paper
Evidence for the Zeeman broadening was searched for in the absorption line profiles of 11 large G and K dwarfs. The analysis employed was different from past efforts in that it is closely tied to the actual physical processes that produce Zeeman-broadened absorption lines in these stars. The radiative line transfer in all Stokes parameters is computed for a model stellar atmosphere and the resulting intensity profiles are disk-integrated to model the stellar rotation and macroturbulence. Zeeman-sensitive profile was constructed, and Zeeman broadening was detected as an excess broadening between the synthesized 8468 profile and the observed profile. Six of the 11 stars were shown to exhibit clear Zeeman broadening, the most extreme being Epsilon Eri and Xi Boo A; Cyg A was found among the stars showing clear Zeeman broadening, contrary to expectations for an old slow rotator. Two stars, Sigma Dra and 54 Psc were found with no Zeemen broadening at all, showing that magnetically weak stars exist later than K0.
Basri Gibor
Marcy Geoffrey W.
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