Examinando por Autor "Oliveira, Raphael A. P."

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    Rubin Observatory LSST Stars Milky Way and Local Volume Star Clusters Roadmap
    (Institute of Physics, 2023-07) Usher, Christopher; Dage, Kristen C.; Girardi, Léo; Barmby, Pauline; Bonatto, Charles J.; Chies-Santos, Ana L.; Clarkson, William I.; Camus, Matias Gómez; Hartmann, Eduardo A.; Ferguson, Annette M. N.; Pieres, Adriano; Prisinzano, Loredana; Rhode, Katherine L.; Rich, R. Michael; Ripepi, Vincenzo; Santiago, Basilio; Stassun, Keivan G.; Street R.A.; Szabó, Róbert; Venuti, Laura; Zaggia, Simone; Canossa, Marco; Floriano, Pedro; Lopes, Pedro; Miranda, Nicole L.; Oliveira, Raphael A. P.; Reina-Campos, Marta; Roman-Lopes A.; Sobeck, Jennifer
    The Vera C. Rubin Observatory will undertake the Legacy Survey of Space and Time, providing an unprecedented, volume-limited catalog of star clusters in the Southern Sky, including Galactic and extragalactic star clusters. The Star Clusters subgroup of the Stars, Milky Way and Local Volume Working Group has identified key areas where Rubin Observatory will enable significant progress in star cluster research. This roadmap represents our science cases and preparation for studies of all kinds of star clusters from the Milky Way out to distances of tens of megaparsecs. © 2023. The Author(s). Published by IOP Publishing Ltd on behalf of the Astronomical Society of the Pacific (ASP). All rights reserved.
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    The VISCACHA Survey: XII. SL 2: Age gap cluster in the southwestern Large Magellanic Cloud
    (EDP Sciences, 0025-03) Ferreira, Bernardo P. L.; Dias, Bruno; Santos, João F. C.; Maia, Francisco F. S.; Bica, Eduardo; Kerber, Leandro O.; Armond, Tina; Quint, Bruno; Oliveira, Raphael A. P.; Souza, Stefano O.; Fernández-Trincado, José G; Katime Santrich, Orlando
    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. © 2025 EDP Sciences. All rights reserved.
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    The VISCACHA Survey: XII. SL 2: Age gap cluster in the southwestern Large Magellanic Cloud
    (EDP Sciences, 0025) Ferreira, Bernardo P. L.; Dias, Bruno; Santos, João F. C.; Maia, Francisco F. S; Bica, Eduardo; Kerber, Leandro O.; Armond, Tina; Quint, Bruno; Oliveira, Raphael A. P.; Souza, Stefano O.; Fernández-Trincado, José G; Katime Santrich, Orlando
    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. © 2025 EDP Sciences. All rights reserved.