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Title:
The energy sources powering the late-time bolometric evolution of SN 1987A
Authors:
Suntzeff, Nicholas B.; Phillips, M. M.; Elias, J. H.; Depoy, D. L.; Walker, A. R.
Affiliation:
AA(Observatorio Interamericano de Cerro Tololo, La Serena, Chile), AB(Observatorio Interamericano de Cerro Tololo, La Serena, Chile), AC(Observatorio Interamericano de Cerro Tololo, La Serena, Chile), AD(Observatorio Interamericano de Cerro Tololo, La Serena, Chile), AE(Ohio State University, Columbus)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 384, Jan. 10, 1992, p. L33-L36. (ApJL Homepage)
Publication Date:
01/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Bolometers, Energy Sources, Magellanic Clouds, Nuclear Fusion, Supernova 1987a, Cobalt Isotopes, Radioactive Isotopes, Stellar Coronas
DOI:
10.1086/186256
Bibliographic Code:
1992ApJ...384L..33S

Abstract

Observations performed in order to elucidate the late-time bolometric evolution of SN 1987A are reported. New optical and infrared data show that a third radioactive nuclide, Co-57, is now powering the SN nebula. The best fit to the late-time bolometric light curve is with 0.01-solar-mass Co-57 (about five times the amount expected based on the solar ratio of Fe-57/Fe-56). If recent theoretical upper limits on the expected production of Co-57 and Ti-44 are correct, then either an additional energy input is needed or one of the fundamental assumptions used in the modeling of the data is in error. If a pulsar is present in the center of SN 1987A, it can be providing no more than about 8 x 10 exp 36 ergs/s on day 1500.

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