CAOSP abstracts, Volume: 38, No.: 2, year: 2008

Author(s): Kochukhov, O.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no. 2, p. 421-422.
Date: 4/2008
Title: Zeeman split lines in CP stars: a discovery of low-contrast fields in slow rotators?
Keyword(s): stars: atmospheres, stars: chemically peculiar, stars: magnetic fields, stars: individual: HD 47103, HD 154708
Pages: 421 -- 422

Abstract: We show that high-resolution observations of resolved Zeeman split lines can be used to obtain new constraints on the stellar magnetic field geometry. In particular, the contrast of the field strength distribution over the stellar surface can be deduced from differential measurement of the second moment of the π and σ Zeeman components. Our analysis of the triplet lines in slowly rotating cool magnetic CP stars uncovers a surprisingly homogeneous field structure, inconsistent with any low-order multipolar geometry.

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