SIMBAD references

2011MNRAS.417.1559P - Mon. Not. R. Astron. Soc., 417, 1559-1575 (2011/October-3)

Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud.


Abstract (from CDS):

We present CCD photometry in the Washington system C, T1 and T2 passbands down to T1∼ 23 in the fields of L3, L28, HW 66, L100, HW 79, IC 1708, L106, L108, L109, NGC 643, L112, HW 84, HW 85 and HW 86, 14 Small Magellanic Cloud (SMC) clusters, most of them poorly studied objects. We measured T1 magnitudes and C-T1 and T1-T2 colours for a total of 213 516 stars spread throughout cluster areas of 14.7 {x} 14.7 arcmin2 each. We carried out an in-depth analysis of the field star contamination of the colour–magnitude diagrams (CMDs) and statistically cleaned the cluster CMDs. Based on the best fits of isochrones computed by the Padova group to the (T1, C-T1) CMDs, as well as from the δ(T1) index and the standard giant branch procedure, we derived ages and metallicities for the cluster sample. With the exception of IC 1708, a relatively metal-poor Hyades-age cluster, the remaining 13 objects are between intermediate and old age (from 1.0 to 6.3 Gyr), their [Fe/H] values ranging from -1.4 to -0.7 dex. By combining these results with others available in the literature, we compiled a sample of 43 well-known SMC clusters older than 1 Gyr, with which we produced a revised age distribution. We found that the present clusters' age distribution reveals two primary excesses of clusters at t∼ 2 and 5 Gyr, which engraves the SMC with clear signs of enhanced formation episodes at both ages. In addition, we found that from the birth of the SMC cluster system until approximately the first 4 Gyr of its lifetime, the cluster formation resembles that of a constant formation rate scenario.

Abstract Copyright: 2011 The Authors. Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): techniques: photometric - galaxies: individual: SMC - Magellanic Clouds - galaxies: star clusters: general

VizieR on-line data: <Available at CDS (J/MNRAS/417/1559): table1.dat table18.dat phot/*>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 49

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