Inferred properties of stellar granulation

Details Inferred properties of stellar granulation Inferred properties of stellar granulation

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..543g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, June 1985, p. 543-550. NSERC-supported research.

Statistics

Computation

37

Convective Heat Transfer, Main Sequence Stars, Stellar Atmospheres, Stellar Physics, Benard Cells, Computational Astrophysics, F Stars, G Stars, Numerical Analysis, Stellar Rotation, Velocity

Scientific paper

Apparent characteristics of stellar granulation in F and G main-sequence stars are inferred directly from observed spectral-line asymmetries and from comparisons of numerical simulations with the observations: (1) the apparent granulation velocity increases with increasing effective temperature, (2) the dispersion of granule velocities about their mean velocity of rise increases with the apparent granulation velocity, (3) the mean velocity of rise of granules must be less than the total line broadening, (4) the apparent velocity difference between granules and dark lanes corresponds to the "granulation velocity" deduced from stellar line bisectors, (5) the dark lanes show velocities of fall approximately twice as large as the granule rise velocities, (6) the light contributed to the stellar flux by the granules is four to ten times more than the light from the dark lanes. Stellar rotation is predicted to produce distortions in the line bisectors which may give information on the absolute velocity displacements of the line bisectors.

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