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The evolution of magnetic hot massive stars: Implementation of the quantitative influence of surface magnetic fields in modern models of stellar evolution

Published online by Cambridge University Press:  28 July 2017

Zsolt Keszthelyi ,
Gregg A. Wade  and
Véronique Petit
Zsolt Keszthelyi
Affiliation:
Department of Physics, Royal Military College of Canada, PO Box 17000 Station Forces, Kingston, ON, K7K 0C6, Canada email: zsolt.keszthelyi@rmc.ca Department of Physics, Engineering Physics and Astronomy, Queen’s University, 99 University Avenue, Kingston, ON, K7L 3N6, Canada
Gregg A. Wade
Affiliation:
Department of Physics, Royal Military College of Canada, PO Box 17000 Station Forces, Kingston, ON, K7K 0C6, Canada email: zsolt.keszthelyi@rmc.ca
Véronique Petit
Affiliation:
Department of Physics and Space Sciences, Florida Institute of Technology, 150 W. University Blvd, Melbourne, FL, 32904, USA Department of Physics and Astronomy, University of Delaware, Newark, DE, 19711, USA
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Abstract

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Large-scale dipolar surface magnetic fields have been detected in a fraction of OB stars, however only few stellar evolution models of massive stars have considered the impact of these fossil fields. We are performing 1D hydrodynamical model calculations taking into account evolutionary consequences of the magnetospheric-wind interactions in a simplified parametric way. Two effects are considered: i) the global mass-loss rates are reduced due to mass-loss quenching, and ii) the surface angular momentum loss is enhanced due to magnetic braking. As a result of the magnetic mass-loss quenching, the mass of magnetic massive stars remains close to their initial masses. Thus magnetic massive stars - even at Galactic metallicity - have the potential to be progenitors of ‘heavy’ stellar mass black holes. Similarly, at Galactic metallicity, the formation of pair instability supernovae is plausible with a magnetic progenitor.

Keywords

stars: magnetic fieldsstars: mass lossstars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S329: The Lives and Death-Throes of Massive Stars , November 2016 , pp. 250 - 254
Copyright
Copyright © International Astronomical Union 2017 

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