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Nickel, argon and cobalt in the infrared spectrum of SN1987A - The core becomes visibleInfrared 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.
Document ID
19880056580
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rank, D. M.
(Lick Observatory Santa Cruz, CA, United States)
Pinto, P. A.
(Lick Observatory Santa Cruz, CA, United States)
Woosley, S. E.
(Lick Observatory Santa Cruz, CA, United States)
Bregman, J. D.
(Lick Observatory Santa Cruz, CA, United States)
Witteborn, F. C.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 13, 2013
Publication Date
February 11, 1988
Publication Information
Publication: Nature
Volume: 331
ISSN: 0028-0836
Subject Category
Astrophysics
Accession Number
88A43807
Distribution Limits
Public
Copyright
Other

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