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Clusters rich in red supergiants

Published online by Cambridge University Press:  27 October 2016

Ignacio Negueruela*
Affiliation:
Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal Escuela Politécnica Superior, Universidad de Alicante Carretera de San Vicente del Raspeig s/n, E03690, San Vicente del Raspeig, Alicante, Spain email: [email protected]
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Abstract

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In the past few years, several clusters containing large numbers of red supergiants have been discovered. These clusters are amongst the most massive young clusters known in the Milky Way, with stellar masses reaching a few 104M. They have provided us, for the first time, with large homogeneous samples of red supergiants of a given age. These large populations make them, despite heavy extinction along their sightlines, powerful laboratories to understand the evolutionary status of red supergiants. While some of the clusters, such as the eponymous RSGC1, are so obscured that their members are only observable in the near-IR, some of them are easily accessible, allowing for an excellent characterisation of cluster and stellar properties. The information gleaned so far from these clusters gives strong support to the idea that late-M type supergiants represent a separate class, characterised by very heavy mass loss. It also shows that the spectral-type distribution of red supergiants in the Milky Way is very strongly peaked towards M1, while suggesting a correlation between spectral type and evolutionary stage.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016 

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