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Evolution of the Precursor of SN1987A

Published online by Cambridge University Press:  12 April 2016

P.R. Wood  and
D.J. Faulkner
P.R. Wood
Affiliation:
Mount Stromlo and Siding Spring Observatories Private Bag, Woden P.O., A.C.T. 2606Australia
D.J. Faulkner
Affiliation:
Mount Stromlo and Siding Spring Observatories Private Bag, Woden P.O., A.C.T. 2606Australia

Extract

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The evolution of a 17.5 M⊙ star, chosen to be similar to the precursor of SN1987A, has been studied using the input physics described in Wood and Faulkner (1987). The calculations: use opacities from the Astrophysical Opacity Library of Huebner et al (1977) with H, He, C, N, O and other metals in LMC ratios; treat semi-convection in the manner of Lamb, Iben and Howard (1976); and assume the mass loss rate to be the minimum of (a) α times the rate give in Waldron (1985) (this rate applied in the blue part of the HR diagram), and (b) L/(cv) (this rate applied in the red), where v is the stellar wind expansion velocity which was taken to be 12 km s−1.

Typical evolutionary tracks resulting from these calculations are shown in Figure 1. The track shown as a continuous line is the one shown in Wood and Faulkner (1987) and corresponds to α = 2.5, while the track shown as a dotted line results from a slightly different treatment of semi-convection on the main-sequence and to α = 1.

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. 410 - 411
Copyright
Copyright © Springer-Verlag 1988

References

Huebner, W.F., Merts, A.L., Magee, N.H. and Argo, M.F. 1977, Astrophysical Opacity Library, Los Alamos Scientific Laboratory, La-6760-M.Google Scholar
Lamb, S.A., Iben, I., and Howard, W.M. 1976, Ap. J., 207, 209.Google Scholar
Waldron, W.L. 1985, The Origin ofNonradiative Heating/Momentum in Hot Stars, Underbill, A.B. and Michelitsianos, A.G. (eds.), NASA Conf. Publ. CP-2358, p. 95.Google Scholar
Wood, P.R. and Faulkner, D.I. 1987, Proc. Astr. Soc. of Australia, in press.Google Scholar