E. Bortolan
YOU?
Author Swipe
View article: The Small Magellanic Cloud through the lens of the <i>James Webb</i> Space Telescope: Binaries and the mass function in the galaxy’s outskirts
The Small Magellanic Cloud through the lens of the <i>James Webb</i> Space Telescope: Binaries and the mass function in the galaxy’s outskirts Open
The stellar initial mass function (IMF) and the fraction of binary systems are fundamental ingredients that govern the formation and evolution of galaxies. Whether the IMF is universal or varies with environment remains one of the central …
View article: Tracing ωCentauri's origins: Spatial and chemical signatures of its formation history
Tracing ωCentauri's origins: Spatial and chemical signatures of its formation history Open
ω}Centauri (ωCen) is the most enigmatic Galactic globular cluster (GC), with unmatched chemical complexity. We combine photometric and spectroscopic catalogs to identify its distinct stellar populations and to investigate their spatial dis…
View article: A joint JWST and HST view of Omega Centauri: Multiple stellar populations and their kinematics
A joint JWST and HST view of Omega Centauri: Multiple stellar populations and their kinematics Open
We combine F115W and F277W images collected with the Near Infrared Camera of the James Webb Space Telescope (JWST) with multi-band, multi-epoch Hubble Space Telescope (HST) observations of Omega Centauri to investigate its multiple stellar…
View article: A JWST project on 47 Tucanae
A JWST project on 47 Tucanae Open
Almost all globular clusters (GCs) contain multiple stellar populations consisting of stars with varying helium and light-element abundances. These populations include first-population stars, which exhibit similar chemical compositions as …
View article: A <i>JWST</i> project on 47 Tucanae: Kinematics, energy equipartition, and anisotropy of multiple populations
A <i>JWST</i> project on 47 Tucanae: Kinematics, energy equipartition, and anisotropy of multiple populations Open
Recent work with JWST has demonstrated its capability to identify and chemically characterize multiple populations in globular clusters down to the H-burning limit. In this study, we explore the kinematics of multiple populations in the gl…
View article: Linking photometry and spectroscopy: profiling multiple populations in globular clusters
Linking photometry and spectroscopy: profiling multiple populations in globular clusters Open
Our understanding of multiple populations in globular clusters (GCs) largely comes from photometry and spectroscopy. Appropriate photometric diagrams are able to disentangle first and second populations (1P and 2P, respectively), with 1P h…
View article: Exploring the formation environment and dynamics of multiple stellar populations in globular clusters through binary systems
Exploring the formation environment and dynamics of multiple stellar populations in globular clusters through binary systems Open
Aims . 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 to many formation scena…
View article: Exploring multiple stellar populations in globular clusters with <i>Euclid</i>: A theoretical overview and insights from NGC 6397
Exploring multiple stellar populations in globular clusters with <i>Euclid</i>: A theoretical overview and insights from NGC 6397 Open
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 the chemical differences b…
View article: Linking Photometry and spectroscopy: profiling multiple populations in globular clusters
Linking Photometry and spectroscopy: profiling multiple populations in globular clusters Open
Our understanding of multiple populations in globular clusters (GCs) largely comes from photometry and spectroscopy: appropriate photometric diagrams can disentangle first and second populations (1P and 2P)-1P having chemical signatures si…
View article: Mass loss along the red giant branch of the intermediate stellar populations in NGC 6752 and NGC 2808
Mass loss along the red giant branch of the intermediate stellar populations in NGC 6752 and NGC 2808 Open
The morphology of the horizontal branch (HB) in globular clusters (GCs) offers some early evidence that they contain multiple populations of stars. Indeed, the location of each star along the HB depends both on its initial helium content (…
View article: New Perspective on the Multiple-population Phenomenon in Galactic Globular Clusters from a Wide-field Photometric Survey
New Perspective on the Multiple-population Phenomenon in Galactic Globular Clusters from a Wide-field Photometric Survey Open
Wide-field photometry of Galactic globular clusters (GCs) has been investigated to overcome limitations from the small field of view of the Hubble Space Telescope in the study of multiple populations. In particular, “chromosome maps” (ChMs…
View article: Mass loss along the red giant branch of the intermediate stellar populations in NGC6752 and NGC2808
Mass loss along the red giant branch of the intermediate stellar populations in NGC6752 and NGC2808 Open
The morphology of the Horizontal Branch (HB) in Globular Clusters (GC) is among the early evidences that they contain multiple populations of stars. Indeed, the location of each star along the HB depends both on its initial helium content …
View article: A JWST project on 47 Tucanae: kinematics, energy equipartition and anisotropy of multiple populations
A JWST project on 47 Tucanae: kinematics, energy equipartition and anisotropy of multiple populations Open
Recent work with JWST has demonstrated its capability to identify and chemically characterize multiple populations in globular clusters down to the H-burning limit. In this study, we explore the kinematics of multiple populations in the gl…
View article: New perspective on the multiple population phenomenon in Galactic globular clusters from a wide-field photometric survey
New perspective on the multiple population phenomenon in Galactic globular clusters from a wide-field photometric survey Open
Wide-field photometry of Galactic globular clusters (GCs) has been investigated to overcome limitations from the small field of view of the Hubble Space Telescope in the study of multiple populations. In particular, 'chromosome maps' (ChMs…
View article: Exploring Simple-population and Multiple-population Globular Clusters in the Outer Galactic Halo Using the Hubble Space Telescope
Exploring Simple-population and Multiple-population Globular Clusters in the Outer Galactic Halo Using the Hubble Space Telescope Open
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 of Galactic GCs using ChMs have provided…
View article: Exploring Multiple Stellar Populations in Globular Clusters with Euclid: A Theoretical Overview and Insights from NGC 6397
Exploring Multiple Stellar Populations in Globular Clusters with Euclid: A Theoretical Overview and Insights from NGC 6397 Open
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 the chemical differences b…
View article: <i>Hubble</i> Space Telescope survey of Magellanic Cloud star clusters. Binaries among the split main sequences of NGC 1818, NGC 1850, and NGC 2164
<i>Hubble</i> Space Telescope survey of Magellanic Cloud star clusters. Binaries among the split main sequences of NGC 1818, NGC 1850, and NGC 2164 Open
Nearly all star clusters younger than ~600 Myr exhibit extended main sequence turnoffs and split main sequences (MSs) in their color-magnitude diagrams. Works based on both photometry and spectroscopy have clearly demonstrated that the red…
View article: Hubble Space Telescope survey of Magellanic Cloud star clusters. Binaries among the split main sequences of NGC 1818, NGC 1850, and NGC 2164
Hubble Space Telescope survey of Magellanic Cloud star clusters. Binaries among the split main sequences of NGC 1818, NGC 1850, and NGC 2164 Open
Nearly all star clusters younger than ~600 Myr exhibit extended main sequence turn offs and split main sequences (MSs) in their color-magnitude diagrams. Works based on both photometry and spectroscopy have firmly demonstrated that the red…
View article: A JWST Project on 47 Tucanae: NIRSpec Spectroscopy of Multiple Populations among M Dwarfs*
A JWST Project on 47 Tucanae: NIRSpec Spectroscopy of Multiple Populations among M Dwarfs* Open
We present the first spectroscopic estimates of the chemical abundance of M dwarf stars in a globular cluster (GC), namely 47 Tucanae. By exploiting NIRSpec on board the James Webb Space Telescope, we gathered low-resolution spectra for 28…
View article: Exploring Simple-Population and Multiple-Population Globular Clusters in the Outer Galactic Halo using the Hubble Space Telescope
Exploring Simple-Population and Multiple-Population Globular Clusters in the Outer Galactic Halo using the Hubble Space Telescope Open
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 of Galactic GCs using the ChM have provide…
View article: A JWST project on 47 Tucanae. NIRSpec spectroscopy of multiple populations among M dwarfs
A JWST project on 47 Tucanae. NIRSpec spectroscopy of multiple populations among M dwarfs Open
We present the first spectroscopic estimates of the chemical abundance of M dwarf stars in a globular cluster (GC), namely 47 Tucanae. By exploiting NIRSpec on board the James Webb Space Telescope (JWST) we gathered low-resolution spectra …
View article: Spectro-Photometry and Radial Distribution of Multiple Stellar Populations in Globular Clusters from Gaia XP Spectra
Spectro-Photometry and Radial Distribution of Multiple Stellar Populations in Globular Clusters from Gaia XP Spectra Open
Understanding the formation of multiple populations in globular clusters (GCs) represents a challenge for stellar population studies. Nevertheless, the outermost cluster regions, likely to hold clues about the initial configuration of GC s…
View article: The original composition of the gas forming first-generation stars in clusters: Insights from HST and JWST
The original composition of the gas forming first-generation stars in clusters: Insights from HST and JWST Open
Globular cluster (GC) stars composed of pristine material, also known as first-generation (1G) stars, are not chemically homogeneous as they exhibit extended sequences in the chromosome map (ChM). Recent studies characterized 1G stars with…
View article: On the original composition of the gas forming first-generation stars in clusters: insights from HST and JWST
On the original composition of the gas forming first-generation stars in clusters: insights from HST and JWST Open
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 stars within the cent…
View article: A JWST Project on 47 Tucanae. Overview, Photometry, and Early Spectroscopic Results of M Dwarfs and Observations of Brown Dwarfs*
A JWST Project on 47 Tucanae. Overview, Photometry, and Early Spectroscopic Results of M Dwarfs and Observations of Brown Dwarfs* Open
James Webb Space Telescope (JWST) observations have been demonstrated to be efficient in detecting multiple stellar populations in globular clusters (GCs) in the low-mass regime of M dwarfs. We present an overview, and first results, of di…
View article: A JWST project on 47 Tucanae. Overview, photometry and early spectroscopic results of M dwarfs, and observation of brown dwarfs
A JWST project on 47 Tucanae. Overview, photometry and early spectroscopic results of M dwarfs, and observation of brown dwarfs Open
The James Webb Space Telescope (JWST) observations have been demonstrated to be efficient in detecting globular clusters' (GCs) multiple stellar populations in the low mass regime of M dwarfs. We present an overview, and first results, of …
View article: Chromosome maps of Globular Clusters from wide-field ground-based photometry
Chromosome maps of Globular Clusters from wide-field ground-based photometry Open
Hubble Space Telescope (HST) photometry is providing an extensive analysis of globular clusters (GCs). In particular, the pseudo two-colour diagram dubbed 'chromosome map (ChM)' allowed to detect and characterize their multiple populations…