[Show abstract][Hide abstract] ABSTRACT: Theoretical models are calculated for stars on the hydrogen-burning
lower main sequence having masses less than or equal to 0.55 solar mass.
Particular attention has been paid to the treatment of the atmosphere
and envelope and to the choice of the radiative opacities and equation
of state. The dependence of the model properties on the outer boundary
conditions is examined, with a detailed comparison of models constructed
using two independent determinations of the equation of state. It is
found that the theoretically inferred properties of stars of mass less
than about 0.10 solar mass can differ noticeably depending on the
assumed input physics.
The Astrophysical Journal 06/1989; 342:1003-1018. · 6.73 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The effects of changes in opacities and mixing length on the main
sequence are investigated. The slope of the theoretical main sequence is
unaffected by changes in opacity data, but is influenced by the ratio of
mixing length to pressure scale height, alpha. Comparison with
observational data seems to favor a small value of this ratio (less than
0.5). The effects on the evolutionary tracks and time scales are also
discussed. The isochrones are found to be unaffected by opacity changes,
whereas the value of alpha plays an important role. Even the luminosity
at the turnoff point depends to some extent on the value of alpha.
Astronomy and Astrophysics 11/1975; · 5.08 Impact Factor
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