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Convective instabilities in SN 1987AFollowing Bandiera (1984), it is shown that the relevant criterion to determine the stability of a blast wave, propagating through the layers of a massive star in a supernova explosion, is the Schwarzschild (or Ledoux) criterion rather than the Rayleigh-Taylor criterion. Both criteria coincide only in the incompressible limit. Results of a linear stability analysis are presented for a one-dimensional (spherical) explosion in a realistic model for the progenitor of SN 1987A. When applying the Schwarzschild criterion, unstable regions get extended considerably. Convection is found to develop behind the shock, with a characteristic growth rate corresponding to a time scale much smaller than the shock traversal time. This ensures that efficient mixing will take place. Since the entire ejected mass is found to be convectively unstable, Ni can be transported outward, even into the hydrogen envelope, while hydrogen can be mixed deep into the helium core.
Document ID
19900033262
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Benz, Willy
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Thielemann, Friedrich-Karl
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 348
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
90A20317
Funding Number(s)
CONTRACT_GRANT: NGR-22-007-272
Distribution Limits
Public
Copyright
Other

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