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Type:	Artigo de Periódico
Title:	The VISCACHA survey - V. Rejuvenating three faint SMC clusters
Authors:	Eduardo Luiz Damiani Bica María Celeste Parisi Stefano Oliveira de Souza Beatriz Leonor Silveira Barbuy Francisco Ferreira de Souza Maia Raphael Augusto Pereira de Oliveira Bruno Moreira de Souza Dias João Francisco Coelho dos Santos Junior João Pedro Rocha Leandro de Oliveira Kerber João Francisco Gardin de Carvalho Ana Cristina Moreira Machado Zadra Armond
Abstract:	We present the analysis of three faint clusters of the Small Magellanic Cloud RZ 82, HW 42, and RZ 158. We employed the SOAR telescope instrument SAM with adaptive optics, allowing us to reach to V ∼ 23–24 mag, unprecedentedly, a depth sufficient to measure ages of up to about 10–12 Gyr. All three clusters are resolved to their centres, and the resulting colour–magnitude diagrams (CMDs) allow us to derive ages of 3.9, 2.6, and 4.8 Gyr, respectively. These results are significantly younger than previous determinations (7.1, 5.0, and 8.3 Gyr, respectively), based on integrated photometry or shallower CMDs. We rule out older ages for these clusters based on deep photometry and statistical isochrone fitting. We also estimate metallicities for the three clusters of [Fe/H] = −0.68, −0.57, and −0.90, respectively. These updated ages and metallicities are in good agreement with the age-metallicity relation for the bulk of SMC clusters. Total cluster masses ranging from ∼ 7–11 · 103 M were estimated from integrated flux, consistent with masses estimated for other SMC clusters of similar ages. These results reduce the number of SMC clusters known to be older than about 5 Gyr and highlight the need of deep and spatially resolved photometry to determine accurate ages for older low-luminosity SMC star clusters.
Subject:	Aglomerado de estrelas
language:	eng
metadata.dc.publisher.country:	Brasil
Publisher:	Universidade Federal de Minas Gerais
Publisher Initials:	UFMG
metadata.dc.publisher.department:	ICX - DEPARTAMENTO DE FÍSICA
Rights:	Acesso Aberto
metadata.dc.identifier.doi:	https://doi.org/10.1093/mnrasl/slac108
URI:	http://hdl.handle.net/1843/64328
Issue Date:	2022
metadata.dc.url.externa:	https://academic.oup.com/mnrasl/article/517/1/L41/6701629
metadata.dc.relation.ispartof:	Monthly Notices of the Royal Astronomical Society: Letters
Appears in Collections:	Artigo de Periódico

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