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The Evolution of the Progenitor of SN 1987A

Published online by Cambridge University Press:  12 April 2016

C. de Loore
Affiliation:
Astrophysical Institute , Vrije Universiteit Brussel, Pleinlaan 2, 1050 BrusselBelgium
C. Doom
Affiliation:
Astrophysical Institute , Vrije Universiteit Brussel, Pleinlaan 2, 1050 BrusselBelgium

Extract

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It is now almost certain that the progenitor of SN 1987 is the B3 supergiant Sk −69°202 (e.g. Walborn et al. 1988). This provides us with valuable constraints on the SN precursor: According to West et al.(1987) the star has Mv=−6.8. Using the calibrations of Humphreys and McElroy (1984) we find that the precursor had Teff = 13000 − 16000K, −Mbol= 7.7 - 8.1 (log L/L = 5.04) and a radius of 48 - 60 R.

The SN precursor was not a red supergiant, but a rather blue supergiant, which also explains the peculiar form of the light curve (Woosley, 1988; Schaeffer et al. 1987). However, standard evolutionary calculations would expect such stars to explode as red supergiants.

Type
Part III. Chemical and Dynamical Structures of Exploding Stars
Copyright
Copyright © Springer-Verlag 1988

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