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Article overview
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Self-consistent physical parameters for 5 intermediate-age SMC stellar clusters from CMD modelling | | Bruno Dias
; Leandro Kerber
; Beatriz Barbuy
; Basilio Santiago
; Sergio Ortolani
; Eduardo Balbinot
; | | Date: |
18 Nov 2013 | | Abstract: | Context. Stellar clusters in the Small Magellanic Cloud (SMC) are useful
probes to study 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 profile 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,
where 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 4.1m SOAR telescope, reaching V~23.
The determination of structural parameters were carried out applying King
profile fitting. The other parameters were derived in a self-consistent way by
means of isochrone fitting, which uses the 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 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
on 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 to 66 kpc, compatible with the
large depth of the SMC. | | Source: | arXiv, 1311.4579 | | Services: | Forum | Review | PDF | Favorites | |
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