Profiles of the spectral lines formed in stochastic multicomponent atmosphere

Details Profiles of the spectral lines formed in stochastic multicomponent atmosphere Profiles of the spectral lines formed in stochastic multicomponent atmosphere

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...360.1086n&link_type=abstract

Astronomy and Astrophysics, Vol. 360, p.1086-1095

Astronomy and Astrophysics

Astrophysics

6

Radiative Transfer, Sun: Atmosphere, Sun: Prominences, Stars: Atmospheres

Scientific paper

An analytical procedure is explored to construct the profiles of the spectral lines formed in a stochastic multicomponent atmosphere. A model one- dimensional problem is solved for the atmospheres in both local thermodynamic equilibrium (LTE) and non-LTE. The results previously obtained by the authors for the LTE atmosphere are generalized to include, in particular, correlations of the random variations in the physical properties of the structural elements. It is shown that the stochastic multicomponent atmosphere may produce a kind of double-peaked profile, which is usually associated with the multiple scattering effects. The problem of the line formation in a stochastic non- LTE atmosphere is considered, assumpting the complete redistribution over frequencies with allowance for the absorption in continuum. For the line profile, a closed- form analytical expression is derived. The computed profiles are compared with those for an homogeneous deterministic atmosphere with preliminarily averaged physical properties. This allows us to conclude that the discrepancy between the line profiles relevant to these two cases may become significant, whereas the normalized profiles are fairly close to each other.

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