The VISCACHA survey - V. Rejuvenating three faint SMC clusters
Carregando...
Data
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Minas Gerais
Descrição
Tipo
Artigo de periódico
Título alternativo
Primeiro orientador
Membros da banca
Resumo
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.
Abstract
Assunto
Aglomerado de estrelas
Palavras-chave
Magellanic clouds, Star clusters
Citação
Departamento
Curso
Endereço externo
https://academic.oup.com/mnrasl/article/517/1/L41/6701629