A5007168548- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- History and Developments in Astronomy
- Astronomical and nuclear sciences
- Geography and Environmental Studies
- Solid-state spectroscopy and crystallography
- Silicone and Siloxane Chemistry
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Agricultural and Food Sciences
- SAS software applications and methods
- Advanced materials and composites
- Manufacturing Process and Optimization
- Transition Metal Oxide Nanomaterials
- Software System Performance and Reliability
- Space Exploration and Technology
- Spectroscopy and Laser Applications
- Planetary Science and Exploration
- Color Science and Applications
- Advanced Software Engineering Methodologies
Universidade Estadual de Santa Cruz
2015-2024
Inesc P&D Brasil
2020-2021
Universidade de São Paulo
2006-2020
Universidade Cidade de São Paulo
2008-2020
Museu de Astronomia e Ciências Afins
2019
Osservatorio Astronomico di Padova
2008-2009
National Institute for Astrophysics
2008
Universidade Federal do Rio Grande do Sul
1999-2006
Pomona College
2006
Friedrich-Alexander-Universität Erlangen-Nürnberg
1999
The Southern Photometric Local Universe Survey (S-PLUS) is imaging ~9300 deg^2 of the celestial sphere in twelve optical bands using a dedicated 0.8 m robotic telescope, T80-South, at Cerro Tololo Inter-American Observatory, Chile. telescope equipped with 9.2k by e2v detector 10 um pixels, resulting field-of-view 2 plate scale 0.55"/pixel. survey consists four main subfields, which include two non-contiguous fields high Galactic latitudes (8000 |b| > 30 deg) and areas plane bulge (for an...
We present color-magnitude diagram analysis of deep Hubble Space Telescope imaging a mass-limited sample 18 intermediate-age (1 - 2 Gyr old) star clusters in the Magellanic Clouds, including 8 for which new data was obtained. find that ${\it all}$ our feature extended main sequence turnoff (eMSTO) regions are wider than can be accounted by simple stellar population (including unresolved binary stars). FWHM widths MSTOs indicate age spreads 200-550 Myr. evaluate dynamical evolution with and...
We analyse deep images from the VISTA survey of Magellanic Clouds in YJKs filters, covering 14 sqrdeg (10 tiles), split into 120 subregions, and comprising main body Wing Small Cloud (SMC). apply a colour--magnitude diagram reconstruction method that returns their best-fitting star formation rate SFR(t), age-metallicity relation (AMR), distance mean reddening, together with 68% confidence intervals. The data can be approximated by plane tilted East-West direction inclination 39 deg, although...
We derive the star formation history (SFH) for several regions of Large Magellanic Cloud (LMC), using deep near-infrared data from VISTA YJKs survey system (VMC). The include three almost-complete 1.4 deg2 tiles located ~3.5° away LMC centre in distinct directions. They are split into 21.0′ × 21.5′ (0.12 deg2) subregions, and each these is analysed independently. To this dataset, we add two 11.3′ (0.036 subregions selected based on their small uniform extinction inside 30 Doradus tile. SFH...
We use the open clusters (OCs) with known parameters available in WEBDA database and recently published papers to derive properties related disk structure such as thin-disk scale height, displacement of Sun above Galactic plane, length OC age-distribution function. The sample totals 654 OCs, consisting basically Trumpler types I III whose spatial distribution traces out local geometry Galaxy. find that population OCs ages younger than 200 Myr distributes following an exponential-decay...
Colour-magnitude diagrams (CMD) of the SMC star cluster NGC419, derived from HST/ACS data, reveal a well-delineated secondary clump located below classical compact red typical intermediate-age populations. We demonstrate that this feature belongs to itself, rather than underlying field. Then, we use synthetic CMDs show it corresponds very well predicted appear as result He-ignition in stars just massive enough avoid electron-degeneracy settling their H-exhausted cores. The main instead is...
Bulge globular clusters (GCs) with metallicities [Fe/H] <~ -1.0 and blue horizontal branches are candidates to harbor the oldest populations in Galaxy. Based on analysis of HST proper-motion-cleaned color-magnitude diagrams filters F435W F625W, we determine physical parameters for old bulge NGC 6522 6626 (M28), both well-defined branches. We compare these results similar data inner halo cluster 6362. These have (-1.3 <= -1.0) obtained from high resolution spectroscopy. derive ages, distance...
We present a catalog of star clusters, associations and related extended objects in the Small Magellanic Cloud Bridge with 2741 entries, factor 2 more than previous version from decade ago. Literature data till December 2018 are included. The identification clusters was carried out digital atlases various bands currently available DSS MAMA imaging surveys. In particular, we cross-identified recent cluster samples VMC, OGLE-IV SMASH surveys, confirming new pointing equivalencies. A major...
The structure of the Small Magellanic Cloud (SMC) is very complex, in particular periphery that suffers more from interactions with Large (LMC). A wealth observational evidence has been accumulated revealing tidal tails and bridges made up gas, stars star clusters. Nevertheless, a full picture SMC outskirts only recently starting to emerge 6D phase-space map plus age metallicity using clusters as tracers. In this work, we continue our analysis another outer region SMC, so-called West Halo,...
The rich SMC star cluster NGC419 has recently been found to present both a broad main sequence turn-off and dual red clump of giants, in the sharp colour-magnitude diagrams (CMD) derived from High Resolution Channel Advanced Camera for Surveys on board Hubble Space Telescope. In this work, we apply data classical method formation history (SFH) recovery via CMD reconstruction, deriving first time function with multiple turn-offs. values metallicity, reddening, distance binary fraction, were...
The HST/ACS colour-magnitude diagrams (CMD) of the populous LMC star cluster NGC1751 present both a broad main sequence turn-off and dual clump red giants. We show that latter feature is real associate it to first appearance electron-degeneracy in H-exhausted cores stars. then apply data classical method formation history (SFH) recovery via CMD reconstruction, for different radii corresponding centre, outskirts, underlying field. mean SFH derived from field taken into account during stage...
We study the luminosity function of intermediate-age red clump stars using deep, near-infrared photometric data covering ∼20 deg2 located throughout central part Small Magellanic Cloud (SMC), comprising main body and galaxy's eastern wing, based on observations obtained with VISTA Survey Clouds (VMC). identified regions that show a foreground population (∼11.8 ± 2.0 kpc in front body) form distance bimodality distribution. The most likely explanation for origin this feature is tidal...
HP$\,$1 is an $\alpha$-enhanced and moderately metal-poor bulge globular cluster with a blue horizontal branch. These combined characteristics make it probable relic of the early star formation in innermost Galactic regions. Here we present detailed analysis deep near-infrared (NIR) photometry obtained NIR GSAOI+GeMS camera at Gemini-South telescope. $J$ $K_{\rm S}$ images were collected exquisite spatial resolution (FWHM $\sim 0.1$ arcsec), reaching stars two magnitudes below MSTO. We...
Globular clusters (GCs) are the most ancient stellar systems in Milky Way. Therefore, they play a key role understanding of early chemical and dynamical evolution our Galaxy. Around $40\%$ them placed within $\sim4$ kpc from Galactic center. In that region, all components overlap, making their disentanglement challenging task. With Gaia DR2, we have accurate absolute proper motions for entire sample known GCs been associated with bulge/bar region. Combining distances, RR Lyrae when...
Abstract The Bayesian isochrone fitting using the Markov chain Monte Carlo algorithm is applied, to derive probability distribution of parameters age, metallicity, reddening, and absolute distance modulus. We introduce SIRIUS code by means simulated color–magnitude diagrams (CMDs), including analysis multiple stellar populations (MPs). population tagging applied from red giant branch bottom main sequence. Through sanity checks synthetic Hubble Space Telescope CMDs globular clusters we verify...
We derive the spatially-resolved star formation history (SFH) for a $96$ deg$^2$ area across main body of Large Magellanic Cloud (LMC), using near-infrared photometry from VISTA survey Clouds (VMC). The data and analyses are characterised by great degree homogeneity low sensitivity to interstellar extinction. 756 subregions size $0.125$ -- corresponding projected sizes about $296\times322\,\mathrm{pc}^{2}$ in LMC analysed. resulting SFH maps, with typical resolution $0.2$--$0.3$ dex...
Estimates of interstellar extinction are essential in a broad range astronomical research. In the last decades, several maps and models large scale Galaxy have been published. However, these developed different programming languages, with user interfaces input/output formats, which makes using comparing results from difficult. To address this issue, we tool called GALExtin (\url{http://www.galextin.org}) - that estimates based on both 3D models/maps 2D available. The only needs to provide...
Aims.We analyzed HST/WFPC2 colour–magnitude diagrams (CMDs) of 15 populous Large Magellanic Cloud (LMC) stellar clusters with ages between ~0.3 Gyr and ~3 Gyr. These (V, ) CMDs are photometrically homogeneous typically reach . Accurate self-consistent physical parameters (age, metallicity, distance modulus reddening) were extracted for each cluster by comparing the observed synthetic ones.
Based on new observations with the Wide Field Camera 3 onboard Hubble Space Telescope, we report discovery of an extended main-sequence turn-off (eMSTO) in intermediate-age star cluster NGC 411. This is second case eMSTO being identified a belonging to Small Magellanic Cloud (SMC), after 419. Despite that present masses these two SMC clusters differ by factor ∼4, comparison between their colour–magnitude diagrams (CMDs) shows striking similarities, especially regarding shape eMSTOs. The loci...
We present results based on YJKs photometry of star clusters located in the outermost, eastern region Small Magellanic Cloud (SMC). analysed a total 51 catalogued whose colour--magnitude diagrams (CMDs), having been cleaned from field-star contamination, were used to assess clusters' reality and estimate ages genuine systems. Based CMD analysis, 15 found be possible non-genuine aggregates. investigated properties 80% this part SMC by enlarging our sample with previously obtained cluster...
We use the Wide Field Camera 3 (WFC3) onboard Hubble Space Telescope (HST) to obtain deep, high resolution images of two intermediate-age star clusters in Large Magellanic Cloud relatively low mass ($\approx$ $10^4$ $M_{\odot}$) and significantly different core radii, namely NGC2209 NGC2249. For comparison purposes, we also re-analyzed archival HST NGC1795 IC2146, other clusters. From observed color-magnitude diagrams with Monte Carlo simulations, find that main sequence turnoff (MSTO)...
The VISCACHA (VIsible Soar photometry of star Clusters in tApii and Coxi HuguA) Survey is an ongoing project based on deep photometric observations Magellanic Cloud clusters, collected using the SOuthern Astrophysical Research (SOAR) telescope together with SOAR Adaptive Module Imager. Since 2015 more than 200 h time were used to observe about 130 stellar most them low mass (M < 104 M⊙) and/or located outermost regions Large Small Cloud. With this high-quality data set, we homogeneously...
(ABRIDGED) The evolution and structure of the Magellanic Clouds is presently under debate. classical scenario where both Large Small (LMC, SMC) are orbiting Milky Way has been challenged by an alternative LMC SMC in their first close passage to our Galaxy. Detailed studies stellar populations galaxies should constrain proposed scenarios. In particular, west halo was recently characterized with radial trends age metallicity which indicates tidal disruption. We increase sample star clusters...