A5055349257- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Erythrocyte Function and Pathophysiology
- Blood groups and transfusion
- Astro and Planetary Science
- History and Developments in Astronomy
- Herpesvirus Infections and Treatments
- Neurological Disorders and Treatments
- Systemic Sclerosis and Related Diseases
- Isotope Analysis in Ecology
- Gastroesophageal reflux and treatments
- Proteoglycans and glycosaminoglycans research
- Immunotherapy and Immune Responses
- Gastrointestinal Tumor Research and Treatment
- Geology and Paleoclimatology Research
- Gastrointestinal motility and disorders
- Eosinophilic Esophagitis
- Abdominal Trauma and Injuries
- Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
- Immunodeficiency and Autoimmune Disorders
- Infectious Encephalopathies and Encephalitis
- Hormonal Regulation and Hypertension
- Porphyrin Metabolism and Disorders
- Medical and Biological Sciences
Osservatorio Astronomico di Padova
2022-2025
University of Padua
1994-2024
University of Genoa
1994
University of Palermo
1994
University of Bari Aldo Moro
1953
Abstract James Webb Space Telescope (JWST) observations have been demonstrated to be efficient in detecting multiple stellar populations globular clusters (GCs) the low-mass regime of M dwarfs. We present an overview, and first results, different projects that can explored by using JWST gathered under program GO2560 for 47 Tucanae, entirely devoted investigation very-low-mass stars, which includes spectroscopic data faintest GC stars spectra are available. Our color–magnitude diagram (CMD)...
Abstract The pseudo two-color diagram, known as chromosome map (ChM), is a valuable tool for identifying globular clusters (GCs), which consist of single or multiple stellar populations (MPs). Recent surveys Galactic GCs using ChMs have provided stringent observational constraints on the formation and their populations. However, these primarily focused at moderate distances from center composed MPs. In this paper, we present first detailed study composition four in outer halo Milky Way: Arp...
ABSTRACT We present a detailed analysis of the internal dynamics multiple stellar populations (MPs) in 28 Galactic globular clusters (GCs) across wide field view, extending from innermost regions to clusters’ outskirts. Using astrophotometric catalogues ground-based observations, Gaia and Hubble Space Telescope (HST), we identify first- (1P) second-population (2P) stars, study MPs using high-precision DR3 HST proper motions. Our results reveal that while 1P transitions isotropy slight...
Recent work has shown that NIR Hubble Space Telescope (HST) photometry allows us to disentangle multiple populations (MPs) among M dwarfs of globular clusters (GCs) and investigate this phenomenon in very low-mass (VLM) stars. Here, we present the color-magnitude diagrams (CMDs) nine GCs open cluster NGC 6791 F110W F160W bands HST, showing main sequences (MSs) below knee are either broadened or split thus providing evidence MPs VLM In contrast, MS is consistent with a single population. The...
We investigate the behavior of multiple stellar populations in globular clusters (GCs) using photometric diagrams constructed with Euclid photometry. By employing synthetic spectra and isochrones that incorporate chemical differences between first-population (1P) stars, resembling field second-population (2P) enriched helium nitrogen but depleted carbon oxygen, we identify, from a theoretical perspective, color-magnitude chromosome maps most effective at distinguishing these within GCs....
Recent work with JWST has demonstrated its capability to identify and chemically characterize multiple populations in globular clusters down the H-burning limit. In this study, we explore kinematics of cluster 47 Tucanae by combining data from JWST, HST, Gaia. We analyzed velocity dispersion anisotropy profiles center out $\sim$10$R_h$. Our findings indicate that while 1G stars are isotropic, 2G significantly radially anisotropic. These results align predictions simulations dynamical...
The morphology of the Horizontal Branch (HB) in Globular Clusters (GC) is among early evidences that they contain multiple populations stars. Indeed, location each star along HB depends both on its initial helium content (Y) and global average mass loss red giant branch ($\mu$). In most GCs, it generally straightforward to analyse first stellar population (standard Y), extreme one (largest while more tricky look at "intermediate" (mildly enhanced Y). this work, we do for GCs NGC6752 NGC2808;...
The morphology of the horizontal branch (HB) in globular clusters (GCs) offers some early evidence that they contain multiple populations stars. Indeed, location each star along HB depends both on its initial helium content (Y) and global average mass loss red giant (μ) In most GCs it is generally straightforward to analyse first stellar population (standard Y) extreme one (largest Y), while more tricky look at 'intermediate' (mildly enhanced Y). this work, we consider segement for NGC,6752...
We investigate the behavior of multiple stellar populations in globular clusters (GCs) using photometric diagrams constructed with Euclid photometry. By employing synthetic spectra and isochrones that incorporate chemical differences between first-population (1P) stars (resembling field stars) second-population (2P) (enriched helium nitrogen, but depleted carbon oxygen) we have identified, from a theoretical perspective, color-magnitude chromosome maps most effective at distinguishing these...
Globular clusters (GCs) are known to host distinct stellar populations, characterized by different chemical compositions. Despite extensive research, the origin of these populations remains elusive. According many formation scenarios, second population (2P) originated within a compact and denser region embedded in more extended first (1P) system. As result, 2P binaries should be disrupted at larger rate than 1P binaries. For this reason, binary systems offer valuable insight into...
Our understanding of multiple populations in globular clusters (GCs) largely comes from photometry and spectroscopy. Appropriate photometric diagrams are able to disentangle first second (1P 2P, respectively), with 1P having chemical signatures similar field stars 2P showing unique light-element variations. Spectroscopy enables detailed analysis abundances these populations. We combined multi-band extensive spectroscopic data investigate the composition across 38 GCs, yielding a abundance...
Recent work with JWST has demonstrated its capability to identify and chemically characterize multiple populations in globular clusters down the H-burning limit. In this study, we explore kinematics of cluster 47,Tucanae by combining data from HST Gaia, ground-based telescopes. We analyzed velocity dispersion anisotropy profiles center out ∼10R_h. Our findings indicate that while first population (1G) stars' motions are isotropic, second (2G) significantly radially anisotropic. These results...
Almost all globular clusters (GCs) contain multiple stellar populations consisting of stars with varying helium and light-element abundances. These include first-population stars, which exhibit similar chemical compositions as halo-field comparable Fe/H second-population characterized by higher nitrogen abundances along reduced levels oxygen carbon. Nowadays, one the most intriguing open questions about GCs pertains to formation evolution their populations. Recent works based on N-body...
Young and intermediate-age star clusters of both Magellanic Clouds exhibit complex color-magnitude diagrams. In addition to the extended main-sequence turn-offs (eMSTOs), commonly observed in younger than ~2 Gyr, ~800 Myr split main sequences (MSs). These comprise a blue MS, composed stars with low-rotation rates, red which hosts fast-rotating stars. While it is widely accepted that stellar populations different rotation rates are responsible for eMSTOs MSs, their formation evolution still...
Globular cluster (GC) stars composed of pristine material, also known as first-generation (1G) stars, are not chemically homogeneous they exhibit extended sequences in the chromosome map (ChM). Recent studies characterized 1G within center 55 Galactic GCs, revealing metallicity variations. Despite this progress, several unanswered questions persist, particularly concerning link between spread and factors such radial distance from or host GC parameters. Additionally, it remains unclear...
Abstract Understanding the formation of multiple populations in globular clusters (GCs) represents a challenge for stellar population studies. Nevertheless, outermost cluster regions, likely to hold clues about initial configuration GC stars, remain underexplored. We use synthetic spectra reflecting chemical compositions first- and second-population (1P, 2P) stars 47 Tucanae identify spectral regions sensitive these populations. This led us define new photometric bands that effectively...
The James Webb Space Telescope (JWST) observations have been demonstrated to be efficient in detecting globular clusters' (GCs) multiple stellar populations the low mass regime of M dwarfs. We present an overview, and first results, different projects that can explored by using JWST gathered under GO2560 for 47 Tucanae, a program entirely devoted investigation very stars, which includes spectroscopic data faintest GC stars spectra are available. Our color-magnitude diagram (CMD) shows some...
Understanding the formation of multiple populations in globular clusters (GCs) represents a challenge for stellar population studies. Nevertheless, outermost GC regions, which may retain information initial configuration populations, are poorly studied. We use synthetic spectra that account chemical compositions first- and second-population (1P, 2P) stars 47 Tucanae to identify spectral regions sensitive its populations. Hence, we defined new photometric bands efficient disentangle 1P 2P...
The pseudo two-color diagram, known as chromosome map (ChM), is a valuable tool for identifying globular clusters (GCs) that consist of single or multiple stellar populations (MPs). Recent surveys Galactic GCs using the ChM have provided stringent observational constraints on formation and their populations. However, these primarily focused at moderate distances from center composed MPs. In this paper, we present first detailed study composition four in outer halo Milky Way: Arp 2, Ruprecht...
Nearly all star clusters younger than sim 600 Myr exhibit extended main sequence turnoffs and split sequences (MSs) in their color-magnitude diagrams. Works based on both photometry spectroscopy have clearly demonstrated that the red MS is composed of fast-rotating stars, whereas blue-MS stars are slow rotators. Nevertheless, mechanism responsible for formation stellar populations with varying rotation rates remains a topic debate. Potential mechanisms proposed include binary interactions,...
Globular cluster (GC) stars composed of pristine material (first-generation, 1G, stars) are not chemically homogeneous, as they exhibit extended sequences in the "Chromosome Map" (ChM). Recent studies characterized 1G within center 55 Galactic GCs, revealing metallicity variations. Despite this progress, several unanswered questions persist, particularly concerning link between spread and factors such radial distance from or host GC parameters. Additionally, it remains unclear whether...
We present the first spectroscopic estimates of chemical abundance M dwarf stars in a globular cluster (GC), namely 47 Tucanae. By exploiting NIRSpec on board James Webb Space Telescope (JWST) we gathered low-resolution spectra for 28 with masses range ~0.4-0.5 solar masses. The are strongly affected by H2O water vapour bands which can be used as indicators oxygen abundance. spectral analysis reveals that target feature different O abundance, difference ~0.40 dex between and most-polluted...