The Open UniversitySkip to content

Westerlund 1 as a Template for Massive Star Evolution

Clark, J. S. (2007). Westerlund 1 as a Template for Massive Star Evolution. Proceedings of the International Astronomical Union, 3 pp. 301–306.

DOI (Digital Object Identifier) Link:
Google Scholar: Look up in Google Scholar


With a dynamical mass Mdyn ~ 1.3×105 M and a lower limit Mcl > 5 × 104 M from star counts, Westerlund 1 is the most massive young open cluster known in the Galaxy and thus the perfect laboratory to study massive star evolution. We have developed a comprehensive spectral classification scheme for supergiants based on features in the 6000–9000Å range, which allows us to identify > 30 very luminous supergiants in Westerlund 1 and ~ 100 other less evolved massive stars, which join the large population of Wolf-Rayet stars already known. Though detailed studies of these stars are still pending, preliminary rough estimates suggest that the stars we see are evolving to the red part of the HR diagram at approximately constant luminosity.

Item Type: Journal Item
ISSN: 1743-9213
Keywords: stars: early-type – stars: evolution – supergiants – stars: Wolf-Rayet – open clusters and associations: individual (Westerlund 1)
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 14968
Depositing User: Astrid Peterkin
Date Deposited: 23 Feb 2009 16:43
Last Modified: 07 Dec 2018 09:20
Share this page:


Altmetrics from Altmetric

Citations from Dimensions

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU