Analysis of the photospheric epoch spectra of type 1a supernovae SN 1990N and SN 1991T

Details Analysis of the photospheric epoch spectra of type 1a supernovae SN 1990N and SN 1991T Analysis of the photospheric epoch spectra of type 1a supernovae SN 1990N and SN 1991T

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..304j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 304-328.

Astronomy and Astrophysics

Astrophysics

105

Local Thermodynamic Equilibrium, Photosphere, Radiative Transfer, Supernovae, Ultraviolet Spectra, White Dwarf Stars, Abundance, Calcium, Cobalt, Iue, Nickel, Silicon, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectrophotometry

Scientific paper

This paper presents an LTE analysis of the photospheric epoch optical and IUE UV spectra of the recent Type Ia supernovae SN 1990N and SN 1991T. It is found that SN 1990N has matter moving as fast as 40,000 km/s, while SN 1991T has matter moving as fast as 20,000 km/s. The exponential density profile with e-folding velocity of 3160 km/s suggested by deflation and delayed/late-detonation explosion models is adequate for calculating fits to the observed spectra. Findings on the iron peak elements suggest that in both SNe some nuclear burning continues into the outer ejecta or the newly synthesized elements are mixed into the outer ejecta. The observed spectra of SN 1990N are consistent with a composition of the inner envelope like that of model W7. Intermediate-mass elements with abundances higher than solar are probably in the outer ejecta of both SNe, while silicon, sulfur, and calcium are underabundance in SN 1991T relative to SN 1990N by factors of order 3, 3, and 120, respectively.

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