منابع مشابه
the investigation of the relationship between type a and type b personalities and quality of translation
چکیده ندارد.
On the nature of the bi-stability jump in the winds of early-type supergiants
We study the origin of the bi-stability jump in the terminal velocity of the winds of supergiants near spectral type B1. Observations show that here the ratio v∞/vesc drops steeply from about 2.6 at types earlier than B1 to a value of v∞/vesc=1.3 at types later than B2. To this purpose, we have calculated wind models and mass-loss rates for early-type supergiants in a Teff grid covering the ran...
متن کاملOutflowing disk winds in B[e] Supergiants
The effects of rapid rotation and bi–stability upon the density contrast between the equatorial and polar directions of a B[e] supergiant are investigated. Based on a new slow solution for different high rotational radiation–driven winds and the fact that bi–stability allows a change in the line–force parameters (α, k, and δ), the equatorial densities are about 10–10 times higher than the polar...
متن کاملThe radiation driven winds of rotating B[e] supergiants
We have formulated the momentum equation for sectorial line driven winds from rotating stars including: (a) the oblateness of the star, (b) gravity darkening (von Zeipel effect), (c) conservation of angular momentum, (d) line driving specified by the force multiplier parameters (k, α, δ), (e) finite disk correction factors for an oblate star with gravity darkening for both the continuum and the...
متن کاملUnderstanding A-type supergiants II. Atmospheric parameters and rotational velocities of Galactic A-type supergiants
We present the second paper of a series whose aim is to perform a global study of Galactic A-supergiants. Very little work has been carried out to determine the stellar parameters of these stars. This is illustrated with a brief review of some previous works. In this paper we analyze the determination of absolute magnitudes, spectral types and atmospheric parameters using the most recent Kurucz...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2010
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921311010258