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Evolution of the Progenitor of SN 1987A in the HR Diagram

Published online by Cambridge University Press:  03 August 2017

H. Yamaoka ,
H. Saio ,
K. Nomoto  and
M. Kato
H. Yamaoka
Affiliation:
1 Department of Astronomy, University of Tokyo
H. Saio
Affiliation:
1 Department of Astronomy, University of Tokyo
K. Nomoto
Affiliation:
1 Department of Astronomy, University of Tokyo
M. Kato
Affiliation:
2 Department of Astronomy, Keio University

Extract

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We calculate the blue-red-blue evolution of the progenitor of SN 1987A in the HR diagram by adopting the Schwarzschild criterion for convection and by choosing appropriate parameters for mass loss and mixing [Fig. 1 (left) where metallicity is Z = 0.005]. During helium burning, the star moves from the blue to the red due to mass loss from 23 M⊙ to 16 M⊙. Figure 2 (right) shows the lifetime in effective temperature bins normalized to unity (solid) compared with the number of supergiants with −8 < Mboi < � 9 in the LMC, which is also normalized to unity (dashed). The model is qualitatively consistent with the observed histogram.

Type
Session VII. Evolution
Information
Symposium - International Astronomical Union , Volume 143: Wolf–Rayet Stars and Interrelations with other Massive Stars in Galaxies , 1991 , pp. 571 - 572
Copyright
Copyright © Kluwer 1991