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

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

2002-08-23

arxiv.org/abs/astro-ph/0208438v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, uses IAUS212.sty (included). To appear in "A Massive Star Odyssey: From Main Sequence to Supernova", K. A.

Scientific paper

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.

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