Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bright OB stars in the Galaxy IV. Stellar and wind parameters of early
  to late B supergiants   We apply the NLTE atmosphere code FASTWIND to perform a spectroscopic study
of a small sample of Galactic B-supergiants from B0 to B9. By means of the
resulting data and incorporating additional datasets from alternative studies,
we investigate the properties of OB-supergiants and compare our findings with
theoretical predictions. As a result we find that due to the combined effects
of line- and wind-blanketing, the temperature scale of Galactic B-supergiants
needs to be revised downwards, by 10 to 20 percent, the latter value being
appropriate for stronger winds. In fair accordance with recent results, our
sample furthermore indicates a gradual decrease in wind terminal velocities
over the bi-stability region, where the limits of this region are located at
lower temperatures than the predicted ones. Introducing a distance-independent
quantity Q' related to wind-strength, we also show that this quantity is a well
defined, monotonically increasing function of Teff outside this region. Inside
and from hot to cool, the mass loss rate changes by a factor (in between 0.4
and 2.5) which is (much) smaller than the predicted factor of 5. All this
indicates that the decrease in wind terminal velocity over the bi-stability
region is not over-compensated by an increase of mass loss rate, as frequently
argued (provided the wind-clumping properties on both sides of this region do
not differ substantially).

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The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
2
The categories of this paper are: math
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys