Limb variation effects in rapidly expanding atmospheres

Details Limb variation effects in rapidly expanding atmospheres Limb variation effects in rapidly expanding atmospheres

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..191h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 191-195.

Astronomy and Astrophysics

Astrophysics

14

Stellar Atmospheres, Supernovae, Astronomical Models, Atmospheric Models, Density Distribution, Limb Darkening, Photosphere, Radiative Transfer

Scientific paper

This paper considers limb variation effects in rapidly expanding atmospheres (such as can be observed in supernovae, novae, or WR stars), in order to investigate the validity of an assumption that the picture of a rapidly expanding scattering-dominated envelope can be regarded as a disk of uniform density; i.e., that the intensity distribution function (IDF) can be regarded as a step function seen by an observer in a certain direction. As an example, a detailed atmospheric non-LTE model is used, the parameters of which can be regarded as typical for a type II supernova during the recombination phase of hydrogen. Results show that the effect of center-to-limb variation in scattering-dominated expanding photospheres is very strong, indicating that the assumption of a disk of constant luminosity is inadequate. Moreover, IDFs are very frequency dependent.

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