Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50...23n&link_type=abstract
Astronomy and Astrophysics, vol. 50, no. 1, July 1976, p. 23-39. Research supported by the Statens Naturvetenskapliga Forskning
Astronomy and Astrophysics
Astrophysics
34
Atmospheric Models, Convection Currents, Solar Atmosphere, Stellar Models, Astronomical Models, Astrophysics, Late Stars, Solar Granulation
Scientific paper
A method is set forth for constructing fully deductive two-stream models of stellar atmospheres. The two streams are defined by thin horizontal slabs, where each slab is split into two well defined, nonstationary components defined according to the sign of the vertical velocity. Conservation of mass, energy, vertical momentum, and number of photons, with due account taken of horizontal exchange, provides a set of differential equations in component mean values. Approximate relations among these mean values provide the remaining equations to obtain a closed set. In estimating rates of exchange of energy, vertical momentum, and photons, it is assumed that the components can be characterized by a typical linear size. Late-type stellar atmospheres are calculated numerically. Two-component solar model atmospheres are in good agreement with recent observations of solar granulation.
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