Analysis of colour-magnitude diagrams of rich LMC clusters

NGC 1831

Basílio X. Santiago, Leandro Kerber, Rodrigo Castro, Mark Wilkinson, Richard de Grijs, Rachel Johnson, Gerry Gilmore, Sylvie Beaulieu

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

43 Citations (Scopus)

Abstract

We present a preliminary analysis of a deep colour-magnitude diagram of NGC 1831, a rich cluster in the LMC. The data were obtained with HST/WFPC2 in the F555W and F814W filters, reaching m(555) similar or equal to 25 mag. Efficient use of the two-dimensional distribution of data was made by comparing the observed colour-magnitude diagram with model ones. We discuss the process used in accounting for field star contamination and sampling incompleteness in the data. We also describe the algorithm used in building artificial diagrams from model isochrones and the statistical method used in comparing model and data colour-magnitude diagrams. From these comparisons we infer a metallicity Z = 0.008 and a low value, f(bin) similar or equal to 0.25, for the global binary fraction of NGC 1831. We also rule out ages T less than or equal to 500 Myr and mass function slope values a greater than or equal to 2.

Original languageEnglish
Title of host publicationExtragalactic star clusters
Subtitle of host publicationproceedings of the 207th Symposium of the IAU held in Pucón, Chile, 12-16 March 2001
EditorsDoug Geisler, Eva K. Grebel, Dante Minniti
Place of PublicationSan Francisco, CA
PublisherAstronomical Society of the Pacific
Pages525-530
Number of pages6
ISBN (Print)158381115X
Publication statusPublished - 2002
Externally publishedYes
EventSymposium on Extragalactic Star Clusters - PUCON, Chile
Duration: 12 Mar 200116 Mar 2001

Publication series

NameInternational Astronomical Union. Symposium
PublisherAstronomical Society of the Pacific
Volume207

Conference

ConferenceSymposium on Extragalactic Star Clusters
CountryChile
CityPUCON
Period12/03/0116/03/01

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