Helium surface distribution on He-peculiar stars

Details Helium surface distribution on He-peculiar stars Helium surface distribution on He-peculiar stars

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991an....312..133v&link_type=abstract

Astronomische Nachrichten (ISSN 0004-6337), vol. 312, no. 2, 1991, p. 133-145.

Astronomy and Astrophysics

Astronomy

7

B Stars, Hot Stars, Line Shape, Peculiar Stars, Stellar Composition, Surface Properties, Chemical Elements, Limb Darkening, Stellar Rotation

Scientific paper

A method has been developed to determine the geometrical parameters of surface distributions of chemical elements on a spotted rotator from observations of variable line strengths. On the basis of simple assumptions for spot geometry and limb darkening this problem has been traced back to the same inverse problem as the determination of surface brightness parameters from photometric observations. The method was applied to eight He-peculiar (CP4) stars to derive the He surface distribution of these He-rich and He-weak stars from the line strength variation of the He I 4026 A line. The result and a discussion of the analysis are given.

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