Axi-symmetric models of B(e) supergiants I. The effective temperature and mass-loss dependence of the hydrogen and helium ionization structure
2008; EDP Sciences; Volume: 478; Issue: 2 Linguagem: Inglês
ISSN
1432-0746
AutoresJ. Zsargó, D. J. Hillier, Л. Георгиев,
Tópico(s)Astronomy and Astrophysical Research
ResumoAims. We calculate the hydrogen and helium ionization in B[e] envelopes and explore their dependence on mass-loss and effective temperature. We also present simulated observations of the Hα emission line and the C iv λλ1550 doublet, and study their behavior. This paper reports our first results in an ongoing study of B[e] supergiants, and provides a glimpse on the ionization of the most important elements in self-consistent numerical simulations. Methods. Our newly developed 2D stellar atmosphere code, ASTAROTH, was used for the numerical simulations. The code selfconsistently solves for the continuum radiation, non-LTE level populations, and electron temperature in axi-symmetric stellar envelopes. Observed profiles were calculated by an auxiliary program developed separately from ASTAROTH. Results. In all but one of our models, H remained fully ionized – only for u
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