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The very rich massive post-main-sequence star population of the open cluster Westerlund 1

Published online by Cambridge University Press:  26 May 2016

Ignacio Negueruela  and
J. Simon Clark
Ignacio Negueruela
Affiliation:
Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, Apdo. de Correos 99, E-03080 Alicante, España
J. Simon Clark
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London, WC1E6BT, England, UK

Abstract

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We report the discovery of a population of Wolf-Rayet stars in the young Galactic open cluster Westerlund 1. In an incomplete shallow spectroscopic survey, we find six nitrogen-rich (WN) and five carbon-rich (WC) WR stars. We also confirm the presence of a large population of yellow supergiants, some of which are candidate hypergiants. Given this population, Westerlund 1 is likely to be one of the most massive young clusters in the Local Group.

Type
Part 3. Location and Distribution of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 531 - 536
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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