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Title

Young star clusters in the Large Magellanic Cloud: NGC 1805 and 1818

Author(s)

Johnson, Rachel A.;  Beaulieu, Sylvie F.;  Gilmore, Gerry F.;  Hurley, Jarrod R.;  Santiago, Basilio X.;  Tanvir, Nial R.;  Elson, Rebecca A. W.

Abstract

We present colour-magnitude diagrams for two rich (approximate to 10(4) M.) Large Magellanic Cloud star clusters with ages approximate to 10(7) yr, constructed from optical and near-infrared data obtained with the Hubble Space Telescope. These data are part of an HST project to study LMC clusters with a range of ages. In this paper we investigate the massive star content of the young clusters, and determine the cluster ages and metallicities, paying particular attention to Be-star and blue-straggler populations and evidence of age spreads. We compare our data with detailed stellar-population simulations to investigate the turn-off structure of approximate to 25 Myr stellar systems, highlighting the complexity of the blue-straggler phenomenon.

Publication type

Journal article

Source

Monthly Notices of the Royal Astronomical Society, Vol. 324, no. 2 (June 2001), p. 367-380

Publication year

2001

Keyword(s)

Be-star;  Blue stragglers;  CCD photometry;  Emission-line stars;  Galaxies;  Hubble Space Telescope;  Initial mass function;  Magellanic Clouds;  NGC-1818;  Star clusters;  Stellar evolution;  WFPC2

Publisher

Blackwell

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1046/j.1365-8711.2001.04291.x

Copyright

Copyright © 2001 the authors. Journal compilation copyright © 2001 Royal Astronomical Society. The accepted manuscript of the paper is reproduced here in accordance with the copyright policy of the publisher. The definitive publication is available at www.interscience.wiley.com.

Full text

Peer reviewed