Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effects of near-core convective shells on the gravity modes of the
  subdwarf B pulsator KIC 10553698A   KIC 10553698A is a hot pulsating subdwarf B (sdB) star observed by the Kepler
satellite. It exhibits dipole (l = 1) and quadrupole (l = 2) gravity modes with
a clear period spacing structure. The seismic properties of the KIC 10553698A
provide a test of stellar evolution models, and offer a unique opportunity to
determine mixing processes. We consider mixing due to convective overshooting
beyond the boundary of the helium burning core. Very small overshooting ( f =
10^{-6} ) results in a progressive increase in the size of convective core.
However, moderate ( f = 10^{-2} ) and small ( f = 10^{-5} ) overshooting both
lead to the occurrence of inert outer convective shells in the near-core
region. We illustrate that the chemical stratifications induced by convective
shells are able to change the g-mode period spacing pattern of a sdB star
appreciably. The mean period spacing and trapping of the gravity modes in the
model with moderate and small core overshooting are fully consistent with the
period spacing trends observed in KIC 10553698A. Atomic diffusion driven by
gravitational settling as well as thermal and chemical gradients is applied to
reach a better match with the observed period spacings. Models that include
small or very small overshooting with atomic diffusion have a decreased
lifetime of the extreme horizontal branch phase and produce chemical
stratification induced by convective shells during helium burning phase. In
addition of being consistent with asteroseismology, their calculated values of
the R2 parameter are more compatible with the observed R2 values.

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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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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: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: gr-qc