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Abstract: With a dynamical mass M dyn ~ 1.3x10e5 M sun and a lower limit M cl>5x10e4M sun from star counts, Westerlund 1 is the most massive young open clusterknown in the Galaxy and thus the perfect laboratory to study massive starevolution. We have developed a comprehensive spectral classification scheme forsupergiants based on features in the 6000-9000A range, which allows us toidentify >30 very luminous supergiants in Westerlund 1 and ~100 other lessevolved massive stars, which join the large population of Wolf-Rayet starsalready known. Though detailed studies of these stars are still pending,preliminary rough estimates suggest that the stars we see are evolving to thered part of the HR diagram at approximately constant luminosity.

Autor: Ignacio Negueruela Alicante, J. Simon Clark Open University, Paul A. Crowther, Lucy Hadfield Sheffield

Fuente: https://arxiv.org/

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