Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud
dc.contributor.author | Piatti, Andres E. | pt_BR |
dc.contributor.author | Claria Olmedo, Juan Jose | pt_BR |
dc.contributor.author | Bica, Eduardo Luiz Damiani | pt_BR |
dc.contributor.author | Geisler, Doug | pt_BR |
dc.contributor.author | Ahumada, Andrea Veronica | pt_BR |
dc.contributor.author | Girardi, Leo Alberto | pt_BR |
dc.date.accessioned | 2014-04-13T01:49:53Z | pt_BR |
dc.date.issued | 2011 | pt_BR |
dc.identifier.issn | 0035-8711 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/93363 | pt_BR |
dc.description.abstract | We present CCD photometry in the Washington system C, T1 and T2 passbands down to T1 ~ 23 in the fields of L3, L28,HW66, L100,HW79, IC 1708, L106, L108, L109, NGC643, L112, HW84, HW85 and HW86, 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 × 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 IC1708, 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. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Monthly notices of the royal astronomical society. Oxford. Vol. 417, no. 2 (Oct. 2011), p. 1559-1575 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Pequena Nuvem de Magalhães | pt_BR |
dc.subject | Techniques: photometric | en |
dc.subject | Galaxies: individual: SMC | en |
dc.subject | Aglomerados estelares | pt_BR |
dc.subject | Fotometria astronômica | pt_BR |
dc.subject | Magellanic clouds | en |
dc.subject | Galaxies: star clusters: general. | en |
dc.title | Washington photometry of 14 intermediate-age to old star clusters in the Small Magellanic Cloud | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000826881 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
Files in this item
This item is licensed under a Creative Commons License
![](/themes/Mirage2Novo//images/lume/cc.png)
-
Journal Articles (39534)Exact and Earth Sciences (6036)