University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Self-consistent physical parameters for five intermediate-age SMC stellar clusters from CMD modelling

Dias, B, Kerber, L, Barbuy, B, Santiago, B, Ortolani, S and Balbinot, E (2013) Self-consistent physical parameters for five intermediate-age SMC stellar clusters from CMD modelling Astronomy & Astrophysics, 2014, Volume 561, id.A106, 14 pp.

Full text not available from this repository.

Abstract

Context. Stellar clusters in the Small Magellanic Cloud (SMC) are useful probes for studying the chemical and dynamical evolution of this neighbouring dwarf galaxy, enabling inspection of a large period covering over 10 Gyr. Aims: The main goals of this work are the derivation of age, metallicity, distance modulus, reddening, core radius, and central density profiles for six sample clusters, in order to place them in the context of the Small Cloud evolution. The studied clusters are AM 3, HW 1, HW 34, HW 40, Lindsay 2, and Lindsay 3; HW 1, HW 34, and Lindsay 2 are studied for the first time. Methods: Optical colour-magnitude diagrams (V,B - V CMDs) and radial density profiles were built from images obtained with the 4.1 m Southern Astrophysical Research (SOAR) telescope, reaching V ~ 23. The determination of structural parameters were carried out by applying King profile fitting. The other parameters were derived in a self-consistent way by means of isochrone fitting, which uses likelihood statistics to identify the synthetic CMDs that best reproduce the observed ones. Membership probabilities were determined comparing the cluster and control field CMDs. Completeness and photometric uncertainties were obtained by performing artificial star tests. Results: The results confirm that these clusters (except HW 34, identified as a field fluctuation) are intermediate-age clusters, with ages between 1.2 Gyr (Lindsay 3) and ~5.0 Gyr (HW 1). In particular HW 1, Lindsay 2 and Lindsay 3 are located in a region that we called West Halo, where studies of ages and metallicity gradients are still lacking. Moreover, Lindsay 2 was identified as a moderately metal-poor cluster with [Fe/H] = -1.4 +/- 0.2 dex, lower than expected from the age-metallicity relation by Pagel & Tautvaisiene (1998). We also found distances varying from ~53 kpc to 66 kpc, compatible with the large depth of the SMC.

Item Type: Article
Authors :
NameEmailORCID
Dias, BUNSPECIFIEDUNSPECIFIED
Kerber, LUNSPECIFIEDUNSPECIFIED
Barbuy, BUNSPECIFIEDUNSPECIFIED
Santiago, BUNSPECIFIEDUNSPECIFIED
Ortolani, SUNSPECIFIEDUNSPECIFIED
Balbinot, Ee.balbinot@surrey.ac.ukUNSPECIFIED
Date : 18 November 2013
Identification Number : 10.1051/0004-6361/201322092
Uncontrolled Keywords : astro-ph.SR, astro-ph.SR, astro-ph.GA
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:22
Last Modified : 17 May 2017 15:10
URI: http://epubs.surrey.ac.uk/id/eprint/838936

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800