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Instantaneous starburst of the massive clusters Westerlund 1 and NGC 3603 YC

Kudryavtseva, Natalia; Brandner, Wolfgang; Gennaro, Mario; Rochau, Boyke; Stolte, Andrea; Andersen, Morten; Da Rio, Nicola; Henning, Thomas; Tognelli, Emanuele; Hogg, David; Clark, Simon and Waters, Rens (2012). Instantaneous starburst of the massive clusters Westerlund 1 and NGC 3603 YC. Astrophysical Journal Letters, 750, article no. L44.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1088/2041-8205/750/2/L44
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Abstract

We present a new method to determine the age spread of resolved stellar populations in a starburst cluster. The method relies on a two-step process. In the first step, kinematic members of the cluster are identified based on multi-epoch astrometric monitoring. In the second step, a Bayesian analysis is carried out, comparing the observed photometric sequence of cluster members with sets of theoretical isochrones. When applying this methodology to optical and near-infrared high angular resolution Hubble Space Telescope (HST) and adaptive optics observations of the ~5 Myr old starburst clusterWesterlund 1 and ~2 Myr old starburst cluster NGC 3603 YC, we derive upper limits for the age spreads of 0.4 and 0.1 Myr, respectively. The results strongly suggest that star formation in these starburst clusters happened almost instantaneously.

Item Type: Journal Item
Copyright Holders: 2012 The American Astronomical Society
ISSN: 2041-8213
Extra Information: 5 pp.
Keywords: Hertzsprung–Russell diagrams; C–M diagrams; open clusters and associations; stellar evolution; stellar formation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 35960
Depositing User: J. Simon Clark
Date Deposited: 08 Jan 2013 15:52
Last Modified: 07 Dec 2018 22:27
URI: http://oro.open.ac.uk/id/eprint/35960
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