R. A. P. Oliveira

The VISCACHA Survey XV: Tracing the 3D Structure and Chemical Evolution of the Outskirts of the Large Magellanic Cloud from Star Clusters

Bernardo P. L. Ferreira, J. F. C. Santos, B. Dias, F. F. S. Maia et autres

Abstract The Large Magellanic Cloud (LMC) is the Milky Way’s most massive satellite. Its interactions with the Small Magellanic Cloud are expected to leave imprints on its structure and evolution. In this work, we use the LMC outer star cluster population to …

br, cu, cl, rs, pl, de, us (code pays fourni par la source)

The VISCACHA survey XIV. Chemical evolution history of the SMC: The Southern Bridge Clusters

S. Saroon, B. Dias, T. Tsujimotto, F. F. S. Maia et autres

The chemical evolution history of the Small Magellanic Cloud (SMC) is complex and is best understood through a comprehensive analysis of star clusters across its various regions. The VISCACHA survey aims to fully explain the chemical evolution of SMC star clusters by …

The VISCACHA Survey: XIII. The extended main-sequence turn-off in intermediate-age low-mass clusters

S. O. Souza, Ángeles Pérez-Villegas, Bruno Dias, L. O. Kerber et autres

The extended main-sequence turn-off (eMSTO) is a well-known feature observed in young and intermediate-age star clusters, characterized by a significant broadening of the main-sequence turn-off region. Although prolonged star formation and stellar rotation have been proposed as possible explanations, no consensus has …

Automated Detection and Modeling of Binary Microlensing Events in OGLE-IV data. I. Events with Well-Separated Bumps

R. A. P. Oliveira, R. Poleski, P. Mróz, A. Udalski et autres

Gravitational microlensing depends primarily on the lens mass and presents a larger occurrence rate in crowded regions, which makes it the best tool to uncover the initial mass function (IMF) of low-mass stars in the Galactic bulge. The bulge IMF can be …

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ELEPHANT: ExtragaLactic alErt Pipeline for Hostless AstroNomical Transients

P. J. Pessi, Rupesh Durgesh, L. Nakazono, Erin E. Hayes et autres

Context. Transient astronomical events that exhibit no discernible association with a host galaxy are commonly referred to as hostless. These rare phenomena can offer unique insights into the properties and evolution of stars and galaxies. However, the sheer number of transients captured …

se, de, br, cu, pl, fr, pt, us, gb, au (code pays fourni par la source)

The VISCACHA Survey – XI. Benchmarking SIESTA: a new synthetic CMD fitting code

Bernardo P. L. Ferreira, J. F. C. Santos, B. Dias, F. F. S. Maia et autres

ABSTRACT We present a novel code, named SIESTA (Statistical matchIng between rEal and Synthetic sTellar popuLations), designed for performing statistical isochrone fitting to colour–magnitude diagrams (CMDs) of single stellar populations by leveraging comparisons between the observed stellar distribution and predictions from synthetic …

br, cl, pl, de, mx, ar (code pays fourni par la source)

Combined Gemini-South and HST photometric analysis of the globular cluster NGC 6558

S. O. Souza, Mattia Libralato, D. Nardiello, L. O. Kerber et autres

Context . NGC 6558 is a low-galactic-latitude globular cluster projected in the direction of the Galactic bulge. Due to high reddening, this region presents challenges in deriving accurate parameters, which require meticulous photometric analysis. We present a combined analysis of near-infrared and …

br, de, mx, rs, pl, it, cl (code pays fourni par la source)

A census of new globular clusters in the Galactic bulge

E. Bica, S. Ortolani, B. Barbuy, R. A. P. Oliveira

Context. The number of known globular clusters in the Galactic bulge has been increasing steadily thanks to different new surveys. Aims. The aim of this study is to provide a census of the newly revealed globular clusters in the Galactic bulge, and …

br, it, pl (code pays fourni par la source)

A census of new globular clusters in the Galactic bulge

E. Bica, S. Ortolani, B. Barbuy, R. A. P. Oliveira

The number of known globular clusters in the Galactic bulge has been increasing steadily thanks to different new surveys. The aim of this study is to provide a census of the newly revealed globular clusters in the Galactic bulge, and analyze their …

Initial mass function of the Galactic bulge from binary microlensing events

R. A. P. Oliveira, Ogle Team

Abstract. The initial mass function of the Galactic bulge can be obtained from Hubble Space Telescope luminosity functions if the statistics of binary stellar systems is well constrained. Such statistics can be estimated using gravitational microlensing effect, which is sensitive to the …

pl (code pays fourni par la source)

The VISCACHA survey – IX. The SMC Southern Bridge in 8D

M. C. Parisi, R. A. P. Oliveira, M S Angelo, B. Dias et autres

ABSTRACT The structure of the Small Magellanic Cloud (SMC) outside of its main body is characterized by tidal branches resulting from its interactions mainly with the Large Magellanic Cloud (LMC). Characterizing the stellar populations in these tidal components helps to understand the …

ar, br, pl, cl, it, mx (code pays fourni par la source)

The VISCACHA survey -- IX. The SMC Southern Bridge in 8D

M. C. Parisi, R. A. P. Oliveira, M S Angelo, B. Dias et autres

The structure of the Small Magellanic Cloud (SMC) outside of its main body is characterised by tidal branches resulting from its interactions mainly with the Large Magellanic Cloud (LMC). Characterising the stellar populations in these tidal components helps to understand the dynamical …