Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The OPAL Equation of State and Low Metallicity Isochrones   The Yale stellar evolution code has been modified to use the OPAL equation of
state tables (Rogers 1994). Stellar models and isochrones were constructed for
low metallicity systems ($-2.8 \le [Fe/H] \le -0.6$). Above $M\sim 0.7\,\msun$,
the isochrones are very similar to those which are constructed using an
equation of state which includes the analytical Debye-Huckel correction at high
temperatures. The absolute magnitude of the main sequence turn-off (\mvto) with
the OPAL or Debye-Huckel isochrones is about 0.06 magnitudes fainter, at a
given age, than \mvto derived from isochrones which do not include the
Debye-Huckel correction. As a consequence, globular clusters ages derived using
\mvto are reduced by 6 -- 7\% as compared to the ages determined from the
standard isochrones. Below $M\sim 0.7\,\msun$, the OPAL isochrones are
systematically hotter (by approximately 0.04 in B-V) at a given magnitude as
compared to the standard, or Debye-Huckel isochrones. However, the lower mass
models fall out of the OPAL table range, and this could be the cause of the
differences in the location of the lower main-sequences.

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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: q-alg