Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synthetic Spectral Analysis of the Hot Component in the S-Type Symbiotic
  Variable EG Andromeda   We have applied grids of NLTE high gravity model atmospheres and optically
thick accretion disk models for the first time to archival IUE and FUSE spectra
of the S-type symbiotic variable EG And taken at superior spectroscopic
conjunction when Rayleigh scattering should be minimal and the hot component is
viewed in front of the red giant. For EG And's widely accepted, published hot
component mass, orbital inclination and distance from the Hipparcos parallax,
we find that hot, high gravity, NLTE photosphere model fits to the IUE spectra
yield distances from the best-fitting models which agree with the Hipparcos
parallax distance but at temperatures substantially lower than the modified
Zanstra temperatures. NLTE fits to an archival FUSE spectrum taken at the same
orbital phase as the IUE spectra yield the same temperature as the IUE
temperature (50,000K). However, for the same hot component mass, inclination
and parallax-derived distance, accretion disk models at moderately high
inclinations, $\sim 60-75^{\circ}$ with accretion rates $\dot{M} = 1\times
10^{-8}$ to $1\times 10^{-9} M_{\sun}/yr$ for white dwarf masses $M_{wd} = 0.4
M_{\sun}$ yield distances grossly smaller than the distance from the Hipparcos
parallax. Therefore, we rule out an accretion disk as the dominant source of
the FUV flux. Our findings support a hot bare white dwarf as the dominant
source of FUV flux.

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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
31
The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-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
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: eess