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Title:
Using SN 1987A light echoes to determine mass loss from the progenitor
Authors:
Crotts, Arlin P. S.; Kunkel, William E.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(Carnegie Institution, Observatoires, Pasadena, CA)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. L73-L77. (ApJL Homepage)
Publication Date:
01/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Emission Spectra, Missing Mass (Astrophysics), Stellar Envelopes, Supernova 1987a, Echoes, Light (Visible Radiation), Red Giant Stars, Stellar Winds
DOI:
10.1086/185912
Bibliographic Code:
1991ApJ...366L..73C

Abstract

The hypothesis that the blue progenitor of SN 1987A passed through a blue supergiant phase ending with the expulsion of the outer envelope is tested. The many light echoes seen near SN 1987A were used to search for a mass flow from the progenitor and for abrupt density changes at the limits of this smooth mass flow. The progenitor needed roughly a million yr to create these structures, assuming a constant mass loss at 15 km/s. The dust in the region is small-grained and isotropically scattering. Interaction between the progenitor blue supergiant and red supergiant winds is probably contained within a roughly spherical structure 1.5 pc in diameter.

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