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On the Z-(in)dependence of the Humphreys-Davidson Limit

Published online by Cambridge University Press:  29 August 2024

Gautham N. Sabhahit Open the ORCID record for Gautham N. Sabhahit [Opens in a new window] ,
Jorick S. Vink Open the ORCID record for Jorick S. Vink [Opens in a new window] ,
Erin R. Higgins Open the ORCID record for Erin R. Higgins [Opens in a new window]  and
Andreas A. C. Sander
Gautham N. Sabhahit*
Affiliation:
Armagh Observatory and Planetarium, College Hill, Armagh, BT61 9 Northern Ireland Queen’s University Belfast, University Road, Belfast, BT7 1NN Northern Ireland
Jorick S. Vink
Affiliation:
Armagh Observatory and Planetarium, College Hill, Armagh, BT61 9 Northern Ireland
Erin R. Higgins
Affiliation:
Armagh Observatory and Planetarium, College Hill, Armagh, BT61 9 Northern Ireland
Andreas A. C. Sander
Affiliation:
Armagh Observatory and Planetarium, College Hill, Armagh, BT61 9 Northern Ireland Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut, Mönchhofstr. 12-14, 69120 Heidelberg, Germany
*
email: gautham.sabhahit@armagh.ac.uk
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Abstract

The temperature independent part of the Humphreys-Davidson (HD) limit sets the boundary for evolutionary channels of massive stars that either end their lives as red supergiants (RSGs) or as the hotter blue supergiants (BSGs) and Wolf-Rayet stars. Recent downward revision of most luminous RSGs the Galaxy below log(L / L⊙) ≈ 5.5, more in line with the Magellanic Clouds, might hint towards a metallicity (Z)-independent HD limit. We present MESA single star models in the 15-40 M⊙ range and study the different Z-dependent processes that could potentially affect the location of the upper luminosity limit of RSGs.

Keywords

Hertzsprung-Russell diagramstars: evolutionstars: late-typestars: fundamental parameters
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 416 - 421
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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