Continuum opacity produced by spectral lines in supernovae and similar expansions

Details Continuum opacity produced by spectral lines in supernovae and similar expansions Continuum opacity produced by spectral lines in supernovae and similar expansions

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..639w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 639-646.

Astronomy and Astrophysics

Astrophysics

18

Doppler Effect, Line Spectra, Opacity, Radiative Transfer, Stellar Spectra, Supernovae, Optical Thickness, Transfer Functions, Velocity Distribution

Scientific paper

Within rapidly expanding objects such as supernovae, the large velocity gradient Doppler spreads the spectral lines to such an extent that even relatively weak transitions affect the propagation of radiation. It is shown that under appropriate conditions (involving the separation between lines and the velocity gradient), the effects of many lines within a small frequency interval produce a contribution to the transfer equation which acts like an ordinary continuum opacity. This expansion opacity is a surprisingly simple function of the Sobolev optical depth of the lines. The dependence of this opacity on frequency, temperature, density, velocity gradient (1/time), and heavy element abundance is evaluated.

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