Element stratification and macroscopic motions in stellar atmospheres

Details Element stratification and macroscopic motions in stellar atmospheres Element stratification and macroscopic motions in stellar atmospheres

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..513v&link_type=abstract

Astronomical Journal, vol. 86, Mar. 1981, p. 513-522.

Statistics

Computation

19

Astronomical Models, Macroscopic Equations, Stellar Atmospheres, Abundance, Convective Flow, Hertzsprung-Russell Diagram, Mass Transfer, Metallic Stars, Reynolds Number, Stellar Mass Accretion, Stellar Structure, Thermal Diffusion, Turbulence Effects

Scientific paper

Our present knowledge concerning the influence of macroscopic motions on diffusion processes of elements in stars is reviewed from an astronomical point of view. From the observations of the chemically peculiar stars (as defined by Preston 1974), one deduces that their atmospheres are more stable than those of normal stars, which favors the diffusion theory as an explanation for their abundance anomalies. However, slow macroscopic motions are needed even in these stars to account quantitatively for their observed anomalies. The diffusion theory can be used to derive information about these macroscopic motions. The question of free parameters which must be introduced in the computations is discussed, and it is shown that real constraints do exist. The fact that the diffusion theory consistently accounts for more observations than any other theory is not due to an underdetermination of free parameters. It provides evidence that this simple physical process does occur in stellar atmospheres.

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