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Re-examing the Upper Mass Limit of Very Massive Stars: VFTS 682, an isolated ~130 M⊙ twin of R136’s WN5h core stars

Published online by Cambridge University Press:  28 July 2017

M. M. Rubio-Díez ,
F. Najarro ,
M. García  and
J. O. Sundqvist
M. M. Rubio-Díez
Affiliation:
Centro de Astrobiología, CSIC-INTA, Madrid, Spain email: [email protected]
F. Najarro
Affiliation:
Centro de Astrobiología, CSIC-INTA, Madrid, Spain email: [email protected]
M. García
Affiliation:
Centro de Astrobiología, CSIC-INTA, Madrid, Spain email: [email protected]
J. O. Sundqvist
Affiliation:
Centro de Astrobiología, CSIC-INTA, Madrid, Spain email: [email protected] Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
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Abstract

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Recent studies of WNh stars at the cores of young massive clusters have challenged the previously accepted upper stellar mass limit (~150 M⊙), suggesting some of these objects may have initial masses as high as 300 M⊙. We investigated the possible existence of observed stars above ~150 M⊙ by i) examining the nature and stellar properties of VFTS 682, a recently identified WNh5 very massive star, and ii) studying the uncertainties in the luminosity estimates of R136’s core stars due to crowding. Our spectroscopic analysis reveals that the most massive members of R136 and VFTS 682 are very similar and our K-band photometric study of R136’s core stars shows that the measurements seem to display higher uncertainties than previous studies suggested; moreover, for the most massive stars in the cluster, R136a1 and a2, we found previous magnitudes were underestimated by at least 0.4 mag. As such, luminosities and masses of these stars have to be significantly scaled down, which then also lowers the hitherto observed upper mass limit of stars.

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. 131 - 135
Copyright
Copyright © International Astronomical Union 2017 

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