Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....44..315s&link_type=abstract
Astronomy and Astrophysics, vol. 44, no. 2, Nov. 1975, p. 315-319.
Astronomy and Astrophysics
Astrophysics
Main Sequence Stars, Mixing Length Flow Theory, Opacity, Stellar Evolution, Astronomical Models, Pressure Distribution, Stellar Luminosity
Scientific paper
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.
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