An analysis of nuclear gamma-ray line profiles from SN 1987 A

Details An analysis of nuclear gamma-ray line profiles from SN 1987 A An analysis of nuclear gamma-ray line profiles from SN 1987 A

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..211g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 211-214.

Astronomy and Astrophysics

Astrophysics

5

Astronomical Spectroscopy, Gamma Ray Spectra, Line Spectra, Nuclear Astrophysics, Supernova 1987A, Cobalt Isotopes, Radioactive Decay, Spectrum Analysis, Stellar Envelopes, Stellar Evolution

Scientific paper

The radioactive products of stellar nucleosynthesis are investigated through a study of nuclear gamma-ray line emissions from SN 1987A. The three highest branching ratio lines at 847 keV, 1238 keV, and 2599 keV from Co-56 have been detected and have thus provided definite proof of the explosive nucleosynthesis of the elements in supernovae. Both the time profile for the 847 keV and 1248 keV line intensity and the observed spectral shape of the emitted 847 keV line are compared with models for which the initial explosion was not spherically symmetric. Both 'fireball' and 'jet' models produced better results that the spherically symmetric mixing models. The 'fireball' model, as expected, produced a broader Doppler spread than the 'jet' for the 847 keV spectrum at 613 d, but the integrals beneath the two curves are similar. It is inferred that the broader peak has a lower maximum amplitude and the two models produce similar chi-squared fits to the observational data (1.11 +/- 0.01) from the 'fireball' against 1.13 +/- 0.01 from the 'jet'.

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