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The Evolution of the Progenitor of SN 1987A

Published online by Cambridge University Press:  12 April 2016

C. de Loore  and
C. Doom
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
Information
International Astronomical Union Colloquium , Volume 108: Atmospherics Diagnostics of Stellar Evolution: Chemical Peculiarity, Mass Loss, and Explosion , 1988 , pp. 246 - 251
Copyright
Copyright © Springer-Verlag 1988

References

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