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He-Abnormal Stars

Published online by Cambridge University Press:  12 April 2016

Kurt Hunger  and
Detlev Groote
Kurt Hunger
Affiliation:
Institut für Theoretische Physik und Sternwarte, Universität Kiel, Olshausenstrasse 40, W-2300 Kiel, Federal Republic of Germany
Detlev Groote
Affiliation:
Institut für Theoretische Physik und Sternwarte, Universität Kiel, Olshausenstrasse 40, W-2300 Kiel, Federal Republic of Germany

Abstract

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The He-rich variable HD 37479 has 2 axes of symmetry, one characterized by the depletion of metals, and one by the enrichment of He. The former is oriented along the axis of the magnetic dipole, while the latter is off set by some 45°. The 2 axes represent 2 different modes of diffusion, the first one being controlled solely by the magnetic field, irrespective of wind, the second one being due to stellar wind that is controlled by the magnetic field and intertial forces. It has been attempted to formulate simple physical conditions that allow to determine the diffusion regions on the surface. It is shown that the resulting surface map can well reproduce the observed phase variations of the equivalent widths of HeI 4471, of UV resonance lines of C IV and Si IV, and the effective magnetic field.

Type
IV. Related Stars
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 394 - 404
Copyright
Copyright © Astronomical Society of the Pacific 1993

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