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Title:
Implementation of New OPAL Tables in Eggleton's Stellar Evolution Code
Authors:
Chen, Xue-Fei; Tout, Christopher A.
Affiliation:
AA(National Astronomical Observatories / Yunnan Observatory, CAS, Kunming 650011 ), AB(Institute of Astronomy, The Observatories, Madingley Road, Cambridge CB3 0HA, England; Centre for Stellar and Planetary Astrophysics, School of Mathematics, Monash University, Clayton, Victoria 3800, Australia)
Publication:
Chinese Journal of Astronomy and Astrophysics, Volume 7, Issue 2, pp. 245-250 (2007).
Publication Date:
04/2007
Origin:
IOP; CJAA
Keywords:
radiative transfer, stars: evolution, stars: general
DOI:
10.1088/1009-9271/7/2/08
Bibliographic Code:
2007ChJAA...7..245C

Abstract

Based on previous works of OPAL, we construct a series of opacity tables for various metallicities Z=0, 0.00001, 0.00003, 0.0001, 0.0003, 0.001, 0.004, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.08 and 0.1. These tables can be easily used in Eggleton's stellar evolution code in place of the old tables without changing the code. The OPAL tables are used for log_{10}(T/{K})> 3.95 and Alexander's for {log}_{10}(T/{K})< 3.95. At {log}_{10}(T/{K})=3.95, the two groups' data fit well for all hydrogen mass fractions. Conductive opacities are included by reciprocal addition according to the formulae of Yakovlev and Urpin. A comparison of 1 and 5 Mȯ models constructed with the older OPAL tables of Iglesias and Rogers shows that the new opacities have most effect in the late stages of evolution, the extension of the blue loop during helium burning for intermediate-mass and massive stars.

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