Non-LTE effect and formation of hydrogen lines in the atmosphere of type II supernovae.
Abstract
Non-LTE (continuum + H-alpha + H-beta + P-alpha) spherically expanding radiative equilibrium model atmospheres composed of pure hydrogen are constructed. The atmospheres simulate type II supernovae characterized by a relatively high temperature prior to the recombination phase. The effect of non-LTE on the temperature structure is studied as well as the presence of a large differential velocity field, the line formation mechanism of hydrogen lines, and the sensitivity of line spectra to the temperature distribution.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 1990
- Bibcode:
- 1990A&A...234..343T
- Keywords:
-
- H Alpha Line;
- H Beta Line;
- Nonequilibrium Thermodynamics;
- Paschen Series;
- Spectral Line Width;
- Stellar Atmospheres;
- Supernovae;
- Hydrogen;
- Linearization;
- Lyman Spectra;
- Newton-Raphson Method;
- Astrophysics