Dust and Gas around lambda Bootis Stars
天体物理学
2007-05-23 v1
摘要
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.
引用
@article{arxiv.astro-ph/9805053,
title = {Dust and Gas around lambda Bootis Stars},
author = {I. Kamp and H. Holweger},
journal= {arXiv preprint arXiv:astro-ph/9805053},
year = {2007}
}
备注
5 pages, 3 figures, to appear in: Proc. of the 26th workshop of the European Working Group on CP stars, eds. P. North, A. Schnell and J. Ziznovsky, Contrib. Astr. Obs. Skalnate Pleso Vol. 27, No 3