Solar models, helium content and mixing length

Details Solar models, helium content and mixing length Solar models, helium content and mixing length

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....79..251m&link_type=abstract

Astronomy and Astrophysics, vol. 79, no. 1-2, Oct. 1979, p. 251-253.

Physics

34

Helium, Hertzsprung-Russell Diagram, Solar Physics, Stellar Models, Abundance, Stellar Luminosity, Stellar Mass Ejection

Scientific paper

The agreement between theory and observations for the case of the sun is discussed. The positions of six solar models in the theoretical H-R diagram are plotted, and an evolutionary track is examined which was computed for a model with 1 solar mass, Y = 0.23, Z = 0.02, and alpha = 2, where alpha is apparently identified as the ratio of mixing length to pressure scale height. It is concluded that the theory of stellar evolution can provide quantitatively correct results within a few percent, at least for the main sequence, that a helium abundance of 0.22 to 0.24 seems to be indicated for the sun in particular, and that the calibration of the mixing-length theory of superadiabatic convection requires a value of 1.5 to about 2 for alpha.

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