Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277.1115z&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 3, pp. 1115-1119.
Astronomy and Astrophysics
Astronomy
4
Stars: Atmospheres, Supernovae: Individual: Sn 1993J
Scientific paper
A Monte Carlo code is employed to extract the density structure in the SN 1993J atmosphere from the photospheric spectra of SN 1993J. With a solar composition of the elemental abundances, the observed spectral lines are well reproduced by a power law density structure of index n~22, except for the strong Hα and HeI lambda5876 lines which show significantly broader P-Cygni absorption profiles than expected. We propose that the discrepancies arise from using too simple a density structure for the supernova atmosphere, and present models which assume a two-component density structure, namely, a steeply decreasing inner envelope enclosed by a much smoother but tenuous outer layer. The power law indices of the two components are most probably 22 and 2, respectively, for the inner and outer layers, with a transition point at about 13000 km s^-1. This smooth outer layer does not affect very much the line profiles of the weak lines, but broadens the strong lines and is able to reproduce much of the line profile behaviour.
Hu Jiang-Yao
Mazzali Paolo A.
Wang Fei-Lu
Wang Zhen-Ru
Zhang Qian
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