A5073120377- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Photocathodes and Microchannel Plates
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Phase Equilibria and Thermodynamics
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- History and Developments in Astronomy
- Environmental Monitoring and Data Management
- Advanced optical system design
- Real-time simulation and control systems
- Optical Systems and Laser Technology
- Distributed and Parallel Computing Systems
- Infrared Target Detection Methodologies
- Galaxies: Formation, Evolution, Phenomena
- Optical Wireless Communication Technologies
National Institute for Astrophysics
2002-2024
Trieste Astronomical Observatory
2006-2024
Astronomical Observatory of Rome
2024
Brera Astronomical Observatory
2024
Context. The MINCE (Measuring at Intermediate Metallicity Neutron-Capture Elements) project aims to provide high quality neutron-capture abundances measurements in several hundred stars intermediate metallicity,-2.5 < [Fe/H] -1.5. This will shed light on the origin of elements and chemical enrichment Milky Way. Aims. goal this work is chemically characterize second sample compare with galactic evolution model our disposal. Methods. We performed a standard abundance analysis based 1D LTE...
The Measuring at Intermediate Metallicity Neutron-Capture Elements (MINCE) project aims to provide high-quality neutron-capture abundances measurements for several hundred stars an intermediate metallicity of -2.5 < Fe/H $<-1.5$. This will shed light on the origin elements and chemical enrichment Milky Way. goal this work is chemically characterize second sample MINCE compare with galactic evolution model our disposal. We performed a standard abundance analysis based one-dimensional...
Abstract FOOT (FragmentatiOn Of Target) is a nuclear physics experiment currently under construction that will measure differential cross sections for the production of secondary fragments induced by interactions proton and ion beams, up to 400 MeV/u, with human tissues. By extending energy range about 800 also provide data useful radio-protection in space, as understanding fragmentation processes take place spacecraft shieldings crucial their optimisation. The collaboration building...
The trends of chemical abundances and abundance ratios observed in stars different ages, kinematics, metallicities bear the imprints several physical processes that concur to shape host galaxy properties. By inspecting these trends, we get precious information on stellar nucleosynthesis, mass spectrum, timescale structure formation, efficiency star as well any inward or outward flows gas. In this paper, analyse recent determinations carbon-to-iron carbon-to-oxygen environments (the Milky Way...
This paper focuses on carbon that is one of the most abundant elements in Universe and high importance field nucleosynthesis galactic stellar evolution. Even nowadays, origin relative massive low- to intermediate-mass stars producing it still a matter debate. In this we aim at better understanding by studying trends [C/H], [C/Fe],and [C/Mg] versus [Fe/H], [Mg/H] for 2133 FGK dwarf from fifth Gaia-ESO Survey internal data release (GES iDR5). The availability accurate parallaxes proper motions...
Context . Most of the studies on determination chemical composition metal-poor stars have been focused search most pristine stars, searching for imprints ejecta first supernovae. Apart from rare and very interesting r-enriched few elements are measurable in stars. On other hand, a lot work has done also thin-disc thick-disc abundance ratios metallicity range [Fe/H]> −1.5 dex to solar. In available literature, intermediate (−2.5<[Fe/H]< −1.5) frequently overlooked. The MINCE...
Using the UVBLUE library of synthetic stellar spectra we have computed a set mid-UV line and continuum spectroscopic indices. We explore their behavior in terms leading parameters [T_eff,log(g)]. The overall result is that indices follow general trends depicted by those from empirical databases. Separately also examine index sensitivity to changes chemical composition, an analysis only feasible under theoretical approach. In this respect, lines FeI3000, BL3096 MgI2852 2828/2921 are least...
We analyze the oxygen abundances of a stellar sample representative two major Galactic populations: thin and thick disks. The aim is to investigate differences between members disks contribute understanding on origin chemical enrichment in Galaxy. analysis based [O\,{\sc i}]=6300.30\,\AA~ line HR spectra ($R\sim$52,500) obtained from GES Survey. By comparing observed with theoretical dataset, computed LTE SPECTRUM synthesis ATLAS12 codes, we derive 516 FGK dwarfs for which have previously...
Context. In recent years, Galactic archaeology has become a particularly vibrant field of astronomy, with its main focus set on the oldest stars our Galaxy. most cases, these have been identified as metal-poor. However, struggle to find ancient fossils produced an important bias in observations – particular, intermediate metal-poor (−2.5 < [Fe/H] −1.5) frequently overlooked. The missing information consequences for precise study chemical enrichment Galaxy, particular what concerns neutron...
The MINCE (Measuring at Intermediate metallicity Neutron-Capture Elements) project aims to gather the abundances of neutron-capture elements but also light and iron peak in a large sample giant stars this range. T aim work is study chemical evolution galactic sub-components recently identified (i.e. Gaia Sausage Enceladus (GSE), Sequoia). We used high signal-to-noise ratios, high-resolution spectra standard 1D LTE spectrum synthesis determine detailed abundances. could for up 10 (Sr, Y, Zr,...
Recent evidence from spectroscopic surveys points towards the presence of a metal-poor, young stellar population in low-alpha , chemically thin disk. In this context, investigation spatial distribution and time evolution precise, unbiased abundances is fundamental to disentangle scenarios formation Galaxy. We study abundance gradients Milky Way by taking advantage large sample open star clusters, which are among best tracers for purpose. particular, we used data last release Gaia -ESO...
Context. Recent evidences from spectroscopic surveys point towards the presence of a metal-poor, young stellar population in chemical thin disk. In this context, investigation spatial distribution and time evolution precise, unbiased abundances is fundamental to disentangle scenarios Galaxy. Aims. We study abundance gradients Milky Way by taking advantage large sample open clusters, which are among best tracers for purpose. particular, we use data last release Gaia-ESO survey. Methods....
Abstract We present the simulation tools developed to aid design phase of Cassegrain U-Band Efficient Spectrograph (CUBES) for Very Large Telescope (VLT), exploring aspects system and evaluating performance different configurations. CUBES aims be ‘ultimate’ ultraviolet (UV) instrument at European Southern Observatory (ESO) in terms throughput, with goal cover bluest part spectrum accessible from ground (300 nm 400 nm) highest possible efficiency. Here we introduce End-to-End (E2E) Exposure...
We present FEROS--Lick/SDSS, an empirical database of Lick/SDSS spectral indices FGK stars to be used in population synthesis projects for discriminating different stellar populations within the integrated light galaxies and globular clusters. From about 2500 FEROS spectra obtained from ESO Science Archive Facility we computed line--strength 1085 non--supergiant with atmospheric parameter estimates AMBRE project. Two samples 312 {\it dwarfs} 83 subgiants} solar chemical composition no...
A new synthetic library of spectral feature indices, Lick/Sloan Digital Sky Survey (SDSS), for stellar population studies is presented. Lick/SDSS computed from spectra with resolving power R = 1800 to fully exploit the content spectroscopic SDSS–DR7 database. The system based on Lick/IDS one complemented a UV index in wavelength region Ca ii H and K lines. well suited study α-element abundances F, G, stars. reliability indices reproducing behaviors observational ones effective temperature,...
Synthetic Lick indices computed with solar scaled abundances and α-element enhancement are presented compared predictions from both theoretical computations (Tripicco & Bell; Thomas, Maraston, Bender; Barbuy et al.) empirical fitting functions (de Freitas Pacheco). We propose selected combinations of capable singling out α-enhanced stars without requiring previous knowledge their main atmospheric parameters. By applying this approach to the 460 in Worthey al. catalog, we detected a list 82...
Abstract We present the baseline conceptual design of Cassegrain U-Band Efficient Spectrograph (CUBES) for Very Large Telescope. CUBES will provide unprecedented sensitivity spectroscopy on a 8 – 10 m class telescope in ground ultraviolet (UV), spanning bandwidth ≥ 100 nm that starts at 300 nm, shortest wavelength accessible from ground. The has been optimized end-to-end efficiency and provides spectral resolving power R 20000, unlock broad range new topics across solar system, Galactic...
The main results of a program systematic comparison between observed and computed UV spectral energy distributions field G-type stars are illustrated. We constructed the for 53 G stars, starting from IUE Uniform Low Dispersion Archive (ULDA) corresponding theoretical fluxes by using atmospheric parameters Catalogue [Fe/H] Determinations (1996 edition) Kurucz grid model fluxes. From observations classical models, excess shortward 2000 Å is evident all stars. continuum in region 1600-2000 can...
We analyzed the spectra of 17,600 F, G, and K stars extracted from seventh Sloan Digital Sky Survey Data Release (SDSS-DR7) database in order to derive [α/Fe], [Ca/Fe], [Mg/Fe] ratios. Particular attention has been devoted estimating homogeneous self-consistent atmospheric parameter values, T eff, log g, [Fe/H], by comparing synthetic observational Lick/SDSS indices. present results for sub-sample more than 4000 whose overall quality allowed us fairly accurate stellar values and, therefore,...
The analysis of the wavelength-dependent albedo exoplanets represents a direct way to provide insight their atmospheric composition and constrain theoretical planetary atmosphere modelling. Wavelength-dependent can be inferred from exoplanet's reflected light host star, but this is not trivial task. In fact, signal may several orders magnitude lower ($10^{-4}$ or below) than flux thus making its extraction very challenging. Successful detection signature 51~Peg\,b has been recently obtained...
Abstract We present a high-resolution synthetic spectral library, INTRIGOSS, designed for studying FGK stars. The library is based on atmosphere models computed with specified individual element abundances via ATLAS12 code. Normalized SPectra (NSPs) and surface Flux (FSP) in the wavelength range 4830–5400 Å were SPECTRUM INTRIGOSS uses solar composition of Grevesse et al. four [ α /Fe] abundance ratios, consists 15,232 spectra. spectra are astrophysical gf -values derived by comparing...
New visual spectrophotometric observations of non-supergiant solar neighborhood stars are combined with IUE Newly Extracted Spectra (INES) energy distributions in order to derive their overall metallicities, [M/H]. This fundamental parameter, together effective temperature and apparent angular diameter, is obtained by applying the flux-fitting method while surface gravity derived from comparison evolutionary tracks theoretical H-R diagram. Trigonometric parallaxes for sample taken Hipparcos...
We present an analysis of 402 F, G, and K solar neighborhood stars, with accurate estimates [Fe/H] in the range -1.0 to +0.5 dex, aimed at detection α-enhanced stars investigation their kinematical properties. The is based on comparison 571 sets spectral indices Lick/IDS system, coming from four different observational data sets, synthetic computed solar-scaled abundances α-element enhancement. use selected combinations single out without requiring previous knowledge main atmospheric...
The science case on studies of accretion and outflows in low-mass ($<$1.5 $M_{\odot}$) young stellar objects (YSOs) with the new CUBES instrument is presented. We show need for a high-sensitivity, near-ultraviolet (NUV) spectrograph like CUBES, resolving power at least four times that X-Shooter combined UVES via fibrelink simultaneous observations. Simulations exposure time calculator end-to-end software significant gain signal-to -noise can be achieved compared to current instruments, both...
We present our numerical simulation approach for the End-to-End (E2E) model applied to various astronomical spectrographs, such as SOXS (ESO-NTT), CUBES (ESO-VLT), and ANDES (ESO-ELT), covering multiple wavelength regions. The E2E aim at simulating expected observations starting from radiation of scientific sources (or calibration sources) up raw-frame data produced by detectors. comprehensive description includes architecture, computational models, tools rendering simulated frames....