Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Spherical Non-LTE Line-Blanketed Stellar Atmosphere Model of the Early
  B Giant epsilon CMa   We use a spherical non-LTE fully line blanketed model atmosphere to fit the
full multi-wavelength spectrum, including the extreme ultraviolet (EUV)
continuum observed by the {\it Extreme Ultraviolet Explorer}, of the B2 II star
\epscma. The available spectrophotometry of \epscma\ from 350 \AA\ to 25
\micron\ is best fit with model parameters \Teff = 21750\,K, \Logg = 3.5, and
an angular diameter of 0.77 mas. The close agreement between the model and the
measured EUV flux from \epscma\ is a result of the higher temperatures at the
formation depths of the \ion{H}{1} and \ion{He}{1} Lyman continua compared to
other models. The realistic model treatment of early B giants with spherical
geometry and NLTE metal line blanketing results in the prediction of
significantly larger EUV fluxes compared with plane-parallel models. We find
that our metal line blanketed spherical models show significantly warmer
temperature structures, 1-3 kK at the formation depth of the Lyman continua,
and predict stronger EUV fluxes, up to a factor of 5 in the \ion{H}{1} Lyman
continuum, compared with plane-parallel atmospheres that have identical model
parameters. In contrast, we find spherical and plane-parallel models that do
not include metal line blanketing are nearly identical. Our \Teff = 21000 K,
\Logg = 3.2, spherical NLTE model predicts more than twice as many hydrogen
ionizing photons and over 200 times more neutral helium ionizing photons than a
standard hydrostatic plane-parallel LTE model with the same stellar parameters.

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The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
2
The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat