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A Diffusion Mass-Loss Model for the Ap Star 53 Cam

Published online by Cambridge University Press:  12 April 2016

J. Babel
J. Babel*
Affiliation:
Institut d’Astronomie de l’Université de Lausanne, CH-1290 Chavannes-des-Bois, Switzerland

Abstract

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The mechanism and properties of mass loss are poorly known for Ap stars. Present upper limits on the mass loss rate are of 10−10 M⊙yr−1, a value which does not permit any element separation. Abundance maps could be a very powerful tool to constrain the mass loss rate and the wind geometry of Ap stars, as surface abundances are sensitive to rates as small as 10−15 M⊙yr−1. We here propose a diffusion-mass loss model for 53 Cam and compute abundance distributions in the photosphere of 53 Cam. The mass loss geometry is determined from the Ca II K line profile and its time variation. We obtain that the diffusion-mass loss model explains many spectral features of 53 Cam, both in the UV and visible domains.

Type
III. Input physics for stellar structure
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 275 - 277
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

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