Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of Low-Mass Population III Stars   We present the evolutionary models of metal-free stars in the mass range from
0.8 to 1.2 Msun with up-to-date input physics. The evolution is followed to the
onset of hydrogen mixing into a convection, driven by the helium flash at red
giant or asymptotic giant branch phase.
  The models of mass M >= 0.9 Msun undergo the central hydrogen flash,
triggered by the carbon production due to the 3-alpha reactions.
  We find that the border of the off-center and central ignition of helium core
flash falls between 1.1 and 1.2 Msun; the models of mass M <= 1.1 Msun
experience the hydrogen mixing at the tip of red giant branch while the models
of M = 1.2 Msun during the helium shell flashes on the asymptotic giant branch.
  The equation of state for the Coulomb liquid region, where electron
conduction and radiation compete, is shown to be important since it affects the
thermal state in the helium core and influences the red giant branch evolution.
  It is also found that the non-resonant term of 3-alpha reactios plays an
important role, although it has negligible effect in the evolution of stars of
younger populations.
  We compare our models with the computations by several other sets of authors,
to confirm the good agreement except for one study which finds the helium
ignition much closer to the center with consequences important for subsequent
evolution.

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The categories of this paper are: eess
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom