Turbulence influenced line formation in stellar atmospheres

Details Turbulence influenced line formation in stellar atmospheres Turbulence influenced line formation in stellar atmospheres

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990an....311...49s&link_type=abstract

Astronomische Nachrichten (ISSN 0004-6337), vol. 311, no. 1, 1990, p. 49-53.

Astronomy and Astrophysics

Astronomy

1

Atmospheric Models, Line Spectra, Radiative Transfer, Stellar Atmospheres, Turbulence Effects, Perturbation Theory, Stochastic Processes, Velocity Distribution

Scientific paper

The influence of stochastic velocity fields with finite correlation lengths on the formation of spectral lines is taken into account without restrictions to specific velocity models. To construct a perturbation theory treating the influence of stochastic motion on the radiative transfer, the stochastic transfer equation for plane-parallel atmospheres is expanded to an infinite hierarchical system. An appropriate cut-off of the infinite system makes it possible to achieve exactly the micro- and marcoturbulent limit at every level of approach. The formalism is derived for n-point correlations of the absorption coefficient and specialized for 2-point correlations.

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