The VISCACHA Survey
Year: 2025
Type: article
Abstract: Context. In the Large Magellanic Cloud (LMC), only seven star clusters have been discovered to be older than ∼4 Gyr and younger than ∼10 Gyr, placing them in what is known as the age gap. Aims. We aim to analyze the photometric data from the VISCACHA survey in the V and I bands to determine, for the first time, the astrophysical parameters of SL 2, revealing that the cluster is indeed situated within the age gap. Methods. We used our newly developed SIESTA code to carry out a statistical isochrone fitting with synthetic color-magnitude diagrams (CMDs) to determine the cluster age, metallicity, distance, color excess, and binary fraction with two grids of stellar evolution models. In addition, the cluster mass was estimated based on its integrated magnitude. Results. The ages obtained from isochrone fitting are compatible with the age gap, amounting to (7.17 ± 0.35) Gyr when using PARSEC-COLIBRI isochrones and (8.02 ± 0.45) Gyr when using MIST. Notably, SL 2 is the first age gap cluster discovered in the southern region of the LMC. The mass of the cluster is considerably smaller than that of the group of older LMC clusters. Conclusions. SL 2 has a comparable metallicity to the other two age gap clusters with similar ages, namely, ESO 121-03 and KMHK 1592, as well as the LMC field star population. While the discovery of a new cluster with such characteristics could be seen as evidence that age gap clusters were formed in situ, the heliocentric distance of SL2 locates it far from the LMC center, akin to the SMC distance. Therefore, the question of its origin, alongside that of other age gap clusters, remains unresolved and open to further investigation.
Source: Astronomy and Astrophysics
Authors: Bernardo P. L. Ferreira, Bruno Dias, João F. C. Santos, Francisco F. S. Maia, Eduardo Bica, Leandro O. Kerber, Tina Armond, Bruno Quint, Raphael A. P. Oliveira, Stefano O. Souza, José G. Fernández-Trincado, Orlando Katime Santrich
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
Funders: National Science Foundation, U.S. Department of Energy, Michigan State University, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Ministério da Ciência, Tecnologia e Inovação, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Universidade Estadual de Santa Cruz, Agencia Nacional de Investigación y Desarrollo, College of Engineering, Michigan State University, University of North Carolina at Chapel Hill, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México, Fondo Nacional de Desarrollo Científico y Tecnológico, SLAC National Accelerator Laboratory
Awards: G1207375514, G1840770272, Final Design, Construction and Operations of Vera C. Rubin Observatory, G2371548206, G262532246, SCARLET (SMC STAR CLUSTER HISTORY WITH VISCACHA), G2823776494, G303061748, G3325778992, G3720054464, G376931201, G4235786860, G4417076677, G4436575305, G4654690619, G4796173437, G5157461147, G5221684681, G5386466380, G5570207115, G5752159476, G5791190013, G5834573078, G603364272, G65609899, G7038554653, G8230373480, G8729155264, CENTRO DE ASTROFISICA Y TECNOLOGIAS AFINES (CATA), G969889393
OpenAlex ID: W4408115847