Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360..650b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. 650-661.
Astronomy and Astrophysics
Astrophysics
21
Cool Stars, Magnetic Flux, Main Sequence Stars, Stellar Atmospheres, Stellar Magnetic Fields, Astronomical Models, Starspots, Stellar Spectra, Stellar Temperature, Zeeman Effect
Scientific paper
Several important tests of likely systematic effects in the analysis of Zeeman broadening on cool stars have been performed. The effects of different atmospheric structures inside and outside of magnetic regions are considered, and the effects of field gradients within flux tubes and of errors in the assumed spectral type of a star are considered. It is found that substantial effects are possible which render the results of one-component analyses somewhat uncertain, with systematic errors potentially as great as 40 percent in the derived magnetic flux. However, it appears that two-component models consisting of quiet and flux tube regions may be oversimplified, since the predicted line profiles tend to be shallower than those observed.
Basri Gibor
Marcy Geoffrey W.
Valenti Jeff A.
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