Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A seismic approach to testing different formation channels of subdwarf B
  stars   There are many unknowns in the formation of subdwarf B stars. Different
formation channels are considered to be possible and to lead to a variety of
helium-burning subdwarfs. All seismic models to date, however, assume that a
subdwarf B star is a post-helium-flash-core surrounded by a thin inert layer of
hydrogen. We examine an alternative formation channel, in which the subdwarf B
star originates from a massive (>~2 Msun) red giant with a non-degenerate
helium-core. Although these subdwarfs may evolve through the same region of the
log g-Teff diagram as the canonical post-flash subdwarfs, their interior
structure is rather different. We examine how this difference affects their
pulsation modes and whether it can be observed.
  Using detailed stellar evolution calculations we construct subdwarf B models
from both formation channels. The iron accumulation in the driving region due
to diffusion, which causes the excitation of the modes, is approximated by a
Gaussian function. The pulsation modes and frequencies are calculated with a
non-adiabatic pulsation code. A detailed comparison of two subdwarf B models
from different channels, but with the same log g and Teff, shows that their
mode excitation is different. The excited frequencies are lower for the
post-flash than for the post-non-degenerate subdwarf B star. This is mainly due
to the differing chemical composition of the stellar envelope. A more general
comparison between two grids of models shows that the excited frequencies of
most post-non-degenerate subdwarfs cannot be well-matched with the frequencies
of post-flash subdwarfs. In the rare event that an acceptable seismic match is
found, additional information, such as mode identification and log g and Teff
determinations, allows us to distinguish between the two formation channels.

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The categories of this paper are: q-alg
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
27
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: math-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an