AGB Phase Transition in Globular Clusters: A Tool for Dating Starbursts

Details AGB Phase Transition in Globular Clusters: A Tool for Dating Starbursts AGB Phase Transition in Globular Clusters: A Tool for Dating Starbursts

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ap%26ss.281..137m&link_type=abstract

Astrophysics and Space Science, v. 281, Issue 1, p. 137-138 (2002).

Astronomy and Astrophysics

Astrophysics

1

Agb Stars, Star Clusters, Merger Remnants

Scientific paper

A new method to detect and study young star clusters is presented. This is based on the knowledge that the light of stellar populations with ages between ˜ 200 Myr and ˜ 1/2 Gyr is dominated by very red, bright AGB stars. Star clusters undergoing this so-called ‘AGB phase transition’ are featured by very red V-K colours, like those of Magellanic Clouds clusters, while optical colours like B-V remain blue typical for young populations. The best channel for detecting star clusters in this age range is therefore the near IR. From the theoretical side, SSP models including properly the contribution of the bright AGB are required (Maraston, 1998). Using this strategy, we succesfully detected the AGB phase transition among the clusters of the merger remnant galaxy NGC 7252 (see Maraston etal., 2001).

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