منابع مشابه
Physical Parameters and Wind Properties of Galactic Early B Supergiants
We present optical studies of the physical and wind properties, plus CNO chemical abundances, of 25 O9.5–B3 Galactic supergiants. We employ non-LTE, line blanketed, extended model atmospheres, which provide a modest downward revision in the effective temperature scale of early B supergiants of up to 1–2kK relative to previous non-blanketed results. The so-called ‘bistability jump’ at B1 (Teff ∼...
متن کاملWind variability of B supergiants II. The two-component stellar wind of γ Arae
The stellar wind of the rapidly rotating early-B supergiant, γAra, is studied using time series, high-resolution IUE spectroscopy secured over∼ 6 days in 1993March. Results are presented based on an analysis of several line species, including N v, C iv, Si iv, Si iii, C ii, and Al iii. Comparisons of the timeaveraged wind line morphology of γ Ara to the UV spectra of other OB stars, and to prof...
متن کاملIonization structure in the winds of B [ e ] supergiants I . Ionization equilibrium calculations in a H plus He wind
The non-spherically symmetric winds of B[e] supergiants are investigated. An empirical density distribution is chosen that accounts for the density concentrations and ratios derived from observations, and our model winds are assumed to contain only hydrogen and helium. We first calculate the approximate ionization radii for H and He and compare the results with the ionization fractions calculat...
متن کاملProperties of Galactic B Supergiants
Physical and wind properties of Galactic B supergiants are presented based upon non-LTE line blanketed model atmospheres, including Sher 25 toward the NGC 3603 cluster. We compare Hα derived wind densities with recent results for SMC B supergiants and generally confirm theoretical expectations for stronger winds amongst Galactic supergiants. Mid B supergiant winds are substantially weaker than ...
متن کاملThe wind momentum-luminosity relationship of galactic A- and B-supergiants
The Balmer lines of four A Ia-supergiants (spectral type A0 to A3) and fourteen B Ia and Ib-supergiants (spectral type B0 to B3) in the solar neighbourhood are analyzed by means of NLTE unified model atmospheres to determine the properties of their stellar winds, in particular their wind momenta. As in previous work for O-stars (Puls et al. 1996) a tight relationship between stellar wind moment...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200809376