Dust and Gas around lambda Bootis Stars

Details Dust and Gas around lambda Bootis Stars Dust and Gas around lambda Bootis Stars

1998-05-06

arxiv.org/abs/astro-ph/9805053v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, to appear in: Proc. of the 26th workshop of the European Working Group on CP stars, eds. P. North, A. Schn

Scientific paper

High-resolution spectra of lambda Bootis stars reveal the presence of circumstellar gas for example in the Ca K line. The example of the normal A star beta Pictoris shows, that the narrow stable absorption component in Ca K can be reproduced using appropriate disk models and a calcium underabundance in the circumstellar gas of a factor of ~30. Similar models are suggested for the group of metal-deficient lambda Bootis stars, but the observational material is still very poor.

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