Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Formation and evolution of a 0.242 Msun helium white dwarf in presence
  of element diffusion   A 0.242 Msun object that finally becomes a helium white dwarf is evolved from
Roche lobe detachment down to very low luminosities. In doing so, we employ our
stellar code to which we have added a set of routines that compute the effects
due to gravitational settling, and chemical and thermal diffusion. Initial
model is constructed by abstracting mass to a 1 Msun red giant branch model up
to the moment at which the model begins to evolve bluewards. We find that
element diffusion introduces noticeable changes in the internal structure of
the star. In particular, models undergo three thermonuclear flashes instead of
one flash as we found with the standard treatment. This fact has a large impact
on the total mass fraction of hydrogen left in the star at entering the final
cooling track. As a result, at late stages of evolution models with diffusion
are characterized by a much smaller nuclear energy release, and they evolve
significantly faster compared to those found with the standard treatment.
  We find that models in which diffusion is considered predict evolutionary
ages for the white dwarf companion to the millisecond pulsar PSR B1855+09 in
good agreement with the spin-down age of the pulsar.

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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
3
The categories of this paper are: physics
1
The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph