Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Case for Case C Mass Transfer in the Galactic Evolution of Black
  Hole Binaries   Earlier works, which we review, have shown that if the Fe core in a
presupernova star is to be sufficiently massive to collapse into a black hole,
earlier in the evolution of the star the He core must be covered (clothed) by a
hydrogen envelope during He core burning and removed only following this, in,
e.g. common envelope evolution. This is classified as Case C mass transfer.
These previous arguments were based chiefly on stellar evolution, especially
depending on the way in which 12C burned.
  In this work we argue for Case C mass transfer on the basis of binary
evolution. The giant progenitor of the black hole will have a large radius 1000
Rsun at the end of its supergiant stage. Its lifetime at that point will be
short, about 1000 yrs, so it will not expand much further. Thus, the initial
giant radius for Case C mass transfer will be constrained to a narrow band
about 1000 Rsun. This has the consequence that the final separation a_f
following common envelope evolution will depend nearly linearly on the mass of
the companion m_d which becomes the donor after the He core of the giant has
collapsed into the black hole. The separation at which this collapse takes
place is essentially a_f, because of the rapid evolution of the giant. (In at
least two binaries the black hole donor separation has been substantially
increased because of mass loss in the black hole formation. These can be
reconstructed from the amount of mass deposited on the donor in this mass
loss.)
  We show that the reconstructed preexplosion separations of the black hole
binaries fit well the linear relationship.

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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph