Solution of the comoving-frame equation of transfer in spherically symmetric flows. II - Picket-fence models

Details Solution of the comoving-frame equation of transfer in spherically symmetric flows. II - Picket-fence models Solution of the comoving-frame equation of transfer in spherically symmetric flows. II - Picket-fence models

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203..647m&link_type=abstract

Astrophysical Journal, vol. 203, Feb. 1, 1976, pt. 1, p. 647-659.

Computer Science

Numerical Analysis

24

Atmospheric Temperature, Numerical Analysis, Radiative Transfer, Stellar Atmospheres, Atmospheric Models, Difference Equations, Line Spectra, Radial Flow, Spectral Energy Distribution, Stellar Winds, Tables (Data), Temperature Distribution, Variable Stars, Velocity Distribution

Scientific paper

To examine the effect of the radial flow of atmospheric material on the temperature distribution in a stellar atmosphere, a picket-fence model with Gaussian lines is formulated and solved numerically in the comoving frame of the gas, which is assumed to move with a prescribed velocity law. Extensive results have been obtained for both static and dynamical models, with planar and moderately extended spherical geometries. For static models, the effect of lines on the temperature distribution is virtually independent of extension. When a large-scale velocity field is imposed, significant surface heating and additional back-warming are found; the magnitude of these effects increases with the extension of the atmosphere. If a significant flow velocity persists to sufficient depth, the enhanced escape probability can lead to a cooling in the deeper layers, which competes with the back-warming. The results obtained here suggest that the deposition of energy arising from the intrusion of line opacity into the continuum, caused by velocity gradients, could influence the dynamics of the flow.-

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