Dougherty, S. M.; Clark, J. S.; Negueruela, I.; Johnson, T. W. and Chapman, J. M.
(2011).
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Abstract
The diverse massive stellar population in the young massive clusterWesterlund 1 (Wd 1) provides an ideal laboratory to observe and constrain mass-loss processes throughout the transitional phase of massive star evolution. A set of high sensitivity radio observations of Wd 1 leads to the detection of 18 cluster members, a sample dominated by cool hypergiants, but with detections among hotter OB supergiants and WR stars. Here the diverse radio properties of the detected sample are briefly described. The mass-loss rates of the detected objects are surprisingly similar across the whole transitional phase of massive star evolution, at ~ 10-5 Mo yr−1. Such a rate is insufficient to strip away the H-rich mantle in a massive star lifetime, unless the stars go through a period of enhanced mass-loss. The radio luminous star W9 provides an example of such an object, with evidence for two eras of mass-loss with rates of ~ 10−4 Mo yr−1.
| Item Type: | Journal Article |
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| Copyright Holders: | Not known |
| ISSN: | 0037-9565 |
| Academic Unit/Department: | Science > Physical Sciences |
| Interdisciplinary Research Centre: | Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR) |
| Item ID: | 24501 |
| Depositing User: | J. Simon Clark |
| Date Deposited: | 02 Dec 2010 11:07 |
| Last Modified: | 18 Nov 2012 06:24 |
| URI: | http://oro.open.ac.uk/id/eprint/24501 |
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