Computer Science
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.331..505r&link_type=abstract
Nature (ISSN 0028-0836), vol. 331, Feb. 11, 1988, p. 505, 506. NASA-NSF-supported research.
Computer Science
79
Argon, Cobalt, Infrared Spectra, Nickel, Stellar Cores, Supernova 1987A, Abundance, Chemical Composition, Emission Spectra, Line Spectra
Scientific paper
Infrared spectra of supernova 1987A taken in April and November 1987 are presented, showing two distinctly different stages in the evolution of the expanding gas shell. The optical and infrared spectrum in April originated from the hydrogen envelope and show weak hydrogen lines rising above a 5,000-K photospheric continuum. The November spectrum was dominated by strong emission lines from heavy elements as well as many lines from highly excited levels of hydrogen, with peak flux levels in the lines at or slightly above the level of the continuum in April. It is concluded that the inner regions of the supernova were just becoming visible in early 1988. It is expected that these regions contain heavy elements produced by advanced nuclear burning stages in the progenitor star and in the shock wave that ejected all material external to the iron core.
Bregman Jesse D.
Pinto Philip A.
Rank David M.
Witteborn Fred. C.
Woosley Stan E.
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