Publications (112)
Looking for imprints of the first stellar generations in metal-poor bulge field stars
C. Siqueira-Mello, C. Chiappini, B. Barbuy +9
Context. Efforts to look for signatures of the first stars have concentrated on metal-poor halo objects. However, the low end of the bulge metallicity distribution has been shown t…
Very metal-poor stars observed by the RAVE survey
G. MatijeviÄ, C. Chiappini, E. K. Grebel +18
We present a novel analysis of the metal-poor star sample in the complete Radial Velocity Experiment (RAVE) Data Release 5 catalog with the goal of identifying and characterizing a…
Does the chemical signature of TYC 8442-1036-1 originate from a rotating massive star that died in a faint explosion?
G. Cescutti, M. Valentini, P. François +4
Context. We have recently investigated the origin of chemical signatures observed in Galactic halo stars by means of a stochastic chemical evolution model. We have found that rotat…
K dwarfs and the chemical evolution of the Solar cylinder
E. Kotoneva, C. Flynn, C. Chiappini +1
K-dwarfs have life-times older than the present age of the Galactic disc, and are thus ideal stars to investigate the disc's chemical evolution. We have developed several photometr…
Exploring the s-process history in the Galactic disk: Cerium abundances and gradients in Open Clusters from the OCCAM/APOGEE sample
J. V. Sales-Silva, S. Daflon, K. Cunha +21
The APOGEE Open Cluster Chemical Abundances and Mapping (OCCAM) survey is used to probe the chemical evolution of the s-process element cerium in the Galactic disk. Cerium abundanc…
Effects of thermohaline instability and rotation-induced mixing on the evolution of light elements in the Galaxy : D, 3He and 4He
N. Lagarde, D. Romano, C. Charbonnel +3
Recent studies of low- and intermediate-mass stars show that the evolution of the chemical elements in these stars is very different from that proposed by standard stellar models.…
Explaining the decrease in ISM lithium at super-solar metallicities in the solar vicinity
G. Guiglion, C. Chiappini, D. Romano +6
We propose here that the lithium decrease at super-solar metallicities observed in high resolution spectroscopic surveys can be explained by the interplay of mixed populations, com…
Stellar Evolution at Low Metallicity
R. Hirschi, C. Chiappini, G. Meynet +2
Massive stars played a key role in the early evolution of the Universe. They formed with the first halos and started the re-ionisation. It is therefore very important to understand…
Estimating stellar birth radii and the time evolution of the Milky Way's ISM metallicity gradient
I. Minchev, F. Anders, A. Recio-Blanco +14
We present a semi-empirical, largely model-independent approach for estimating Galactic birth radii, r_birth, for Milky Way disk stars. The technique relies on the justifiable assu…
NGC 6705 a young -enhanced Open Cluster from OCCASO data
L. Casamiquela, R. Carrera, L. Balaguer-Núñez +12
The stellar [/Fe] abundance is sometimes used as a proxy for stellar age, following standard chemical evolution models for the Galaxy, as seen by different observational result…
K2 results for "young" -rich stars in the Galaxy
V. Grisoni, C. Chiappini, A. Miglio +11
The origin of apparently young -rich stars in the Galaxy is still a matter of debate in Galactic archaeology, whether they are genuinely young or might be products of binary ev…
Cool stars in the Galactic Center as seen by APOGEE: M giants, AGB stars and supergiant stars/candidates
M. Schultheis, A. Rojas-Arriagada, K. Cunha +11
The Galactic Center region, including the nuclear disk, has until recently been largely avoided in chemical census studies because of extreme extinction and stellar crowding. Makin…
The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
D. Romano, L. Magrini, S. Randich +31
We exploit the unique characteristics of a sample of open clusters (OCs) and field stars for which high-precision 7Li abundances and stellar parameters are homogeneously derived by…
Spectroscopic age estimates for APOGEE red-giant stars: Precise spatial and kinematic trends with age in the Galactic disc
F. Anders, P. Gispert, B. Ratcliffe +12
Over the last few years, many studies have found an empirical relationship between the abundance of a star and its age. Here we estimate spectroscopic stellar ages for 178 825 red-…
unVEil the darknesS of The gAlactic buLgE (VESTALE)
G. Bono, M. Dall'Ora, M. Fabrizio +55
The main aim of this experiment is to provide a complete census of old (t > 10 Gyr, RR Lyrae, type II Cepheids, red horizontal branch), intermediate age (red clump, Miras) and youn…
Time evolution of Ce as traced by APOGEE using giant stars observed with the Kepler, TESS and K2 missions
G. Casali, V. Grisoni, A. Miglio +11
Abundances of s-capture process elements in stars with exquisite asteroseismic, spectroscopic, and astrometric constraints offer a novel opportunity to study stellar evolution, nuc…
The origin of nitrogen: Implications of recent measurements of N/O in Galactic metal-poor stars
C. Chiappini, F. Matteucci, S. K. Ballero
Recent new high-precision abundance data for Galactic halo stars suggest important primary nitrogen production in very metal-poor massive stars. Here, we compute a new model for th…
Milky Way's Thick and Thin disk: Is there distinct thick disk?
D. Kawata, C. Chiappini
This article is based on our discussion session on Milky Way models at the 592 WE-Heraeus Seminar, Reconstructing the Milky Way's History: Spectroscopic Surveys, Asteroseismology a…
The Mass-Metallicity relation in galaxies of different morphological types
F. Calura, A. Pipino, C. Chiappini +4
By means of chemical evolution models of different morphological types, we study the mass-metallicity (MZ) relation and its evolution with redshift. Our aim is to understand the ro…
Abundances in 78 metal-rich bulge spheroid stars from APOGEE
H. Ernandes, B. Barbuy, C. Chiappini +9
The inner Galaxy is the most complex region of the Milky Way, comprising the bulge, inner thin and thick discs, and inner halo; the formation of the bar transferred gas and stars f…
Planetary nebulae in the direction of the Galactic bulge: On nebulae with emission-line central stars
S. K. Gorny, C. Chiappini, G. Stasinska +1
We present a homogeneous set of spectroscopic measurements secured with 4-meter class telescopes for a sample of 90 planetary nebulae (PNe) located in the direction of the Galactic…
Chemical similarities between Galactic bulge and local thick disk red giant stars
J. Melendez, M. Asplund, A. Alves-Brito +8
The evolution of the Milky Way bulge and its relationship with the other Galactic populations is still poorly understood. The bulge has been suggested to be either a merger-driven…
Chemical abundances of the young inner-disk open cluster NGC 6705 observed by APOGEE: sodium-rich and not -enhanced
V. Loaiza-Tacuri, K. Cunha, D. Souto +19
Previous results in the literature have found the young inner-disk open cluster NGC 6705 to be mildly -enhanced. We examined this possibility via an independent chemical abunda…
The Gaia-ESO Survey: New constraints on the Galactic disc velocity dispersion and its chemical dependencies
G. Guiglion, A. Recio-Blanco, P. de Laverny +27
Understanding the history and the evolution of the Milky Way disc is one of the main goals of modern astrophysics. We study the velocity dispersion behaviour of Galactic disc stars…
A perspective on the Milky Way Bulge-Bar as seen from the neutron-capture elements Cerium and Neodymium with APOGEE
J. V. Sales-Silva, K. Cunha, V. V. Smith +28
This study probes the chemical abundances of the neutron-capture elements cerium and neodymium in the inner Milky Way from an analysis of a sample of 2000 stars in the Galact…
The evolution of the mass-metallicity relation in galaxies of different morphological types
F. Calura, A. Pipino, C. Chiappini +3
By means of chemical evolution models for ellipticals, spirals and irregular galaxies, we aim at investigating the physical meaning and the redshift evolution of the mass-metallici…
Chemical gradients in the Milky Way from the RAVE data. II. Giant stars
C. Boeche, A. Siebert, T. Piffl +19
We provide new constraints on the chemo-dynamical models of the Milky Way by measuring the radial and vertical chemical gradients for the elements Mg, Al, Si, Ti, and Fe in the Gal…
RAVE stars in K2 - I. Improving RAVE red giants spectroscopy using asteroseismology from K2 Campaign 1
M. Valentini, C. Chiappini, G. R. Davies +29
We present a set of 87 RAVE stars with detected solar like oscillations, observed during Campaign 1 of the K2 mission (RAVE K2-C1 sample). This dataset provides a useful benchmark…
Galactic Archeology with 4MOST
S. Feltzing, T. Bensby, M. Bergemann +8
4MOST is a new wide-field, high-multiplex spectroscopic survey facility for the VISTA telescope of ESO. Starting in 2022, 4MOST will deploy more than 2400 fibres in a 4.1 square de…
Young [/Fe]-enhanced stars discovered by CoRoT and APOGEE: What is their origin?
C. Chiappini, F. Anders, T. S. Rodrigues +34
We report the discovery of a group of apparently young CoRoT red-giant stars exhibiting enhanced [alpha/Fe] abundance ratios (as determined from APOGEE spectra) with respect to Sol…
The K2 Galactic Caps Project -- Going Beyond the \textit{Kepler} Field and Ageing the Galactic Disc
B. M. Rendle, A. Miglio, C. Chiappini +21
Analyses of data from spectroscopic and astrometric surveys have led to conflicting results concerning the vertical characteristics of the Milky Way. Ages are often used to provide…
Chemical radial gradients for the bulge-bar stellar populations from the APOGEE survey
J. V. Sales-Silva, K. Cunha, V. V. Smith +20
The Milky Way bulge-bar is composed of multiple populations. Using chemical and kinematical planes, we segregate six populations in a bulge-bar sample observed by the APOGEE survey…
The CoRoT-GES Collaboration. Improving Red Giants spectroscopic surface gravity and abundances with asteroseismology
M. Valentini, C. Chiappini, A. Miglio +4
Nowadays large spectroscopic surveys, like the Gaia-ESO Survey (GES), provide unique stellar databases for better investigating the formation and evolution of our Galaxy. Great att…
A new imprint of fast rotators: low 12C/13C ratios in extremely metal-poor halo stars
C. Chiappini, S. Ekström, G. Meynet +3
(abridged) Fast stellar rotation is currently the most promising mechanism for producing primary nitrogen in metal-poor massive stars. Chemical evolution models computed with the i…
How Many Components? Quantifying the Complexity of the Metallicity Distribution in the Milky Way Bulge with APOGEE
A. Rojas-Arriagada, G. Zasowski, M. Schultheis +14
We use data of 13,000 stars from the SDSS/APOGEE survey to study the shape of the bulge MDF within the region and , and spatially constr…
High-resolution abundance analysis of red giants in the globular cluster NGC 6522
B. Barbuy, C. Chiappini, E. Cantelli +11
The [Sr/Ba] and [Y/Ba] scatter observed in some galactic halo stars that are very metal-poor stars and in a few individual stars of the oldest known Milky Way globular cluster NGC…
SPINSTARS at low metallicities
G. Meynet, S. Ekstrom, A. Maeder +3
The main effect of axial rotation on the evolution of massive PopIII stars is to trigger internal mixing processes which allow stars to produce significant amounts of primary nitro…
Barium lines in high-quality spectra of two metal-poor giants in the Galactic halo
G. Cescutti, C. Morossi, M. Franchini +9
Context. Theoretical results showed the possibility that neutron capture elements were produced in the early Universe by two different sources: a frequent s-process source hosted b…
The mass surface density in the local disk and the chemical evolution of the Galaxy
D. Romano, F. Matteucci, P. Salucci +1
We have studied the effect of adopting different values of the total baryonic mass surface density in the local disk at the present time in a model for the chemical evolution of th…
Chemodynamical history of the Galactic Bulge
B. Barbuy, C. Chiappini, O. Gerhard
The Galactic Bulge can uniquely be studied from large samples of individual stars, and is therefore of prime importance for understanding the stellar population structure of bulges…
Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18
F. Anders, A. Khalatyan, C. Chiappini +19
Combining the precise parallaxes and optical photometry delivered by Gaia's second data release (Gaia DR2) with the photometric catalogues of PanSTARRS-1, 2MASS, and AllWISE, we de…
A strong case for fast stellar rotation at very low metallicities
C. Chiappini, R. Hirschi, G. Meynet +3
We investigate the effect of new stellar models, which take rotation into account, computed for a metallicity Z = 10^{-8} on the chemical evolution of the earliest phases of the Mi…
Tracing the Milky Way: Calibrating chemical ages with high-precision Kepler data
G. Casali, J. Montalbà n, A. Miglio +10
Chemical clocks offer a powerful tool for estimating stellar ages from spectroscopic surveys. We present a new detailed spectroscopic analysis of 68 Kepler red giant stars to provi…
Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost
A. Khalatyan, F. Anders, C. Chiappini +14
In this paper, we explore the feasibility of using machine learning regression as a method of extracting basic stellar parameters and line-of-sight extinctions from spectro-photome…
Chemodynamics of the Milky Way. I. The first year of APOGEE data
F. Anders, C. Chiappini, B. X. Santiago +38
We investigate the chemo-kinematic properties of the Milky Way disc by exploring the first year of data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE), an…
Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE
B. Barbuy, A. C. S. Friaça, H. Ernandes +22
Stars presently identified in the bulge spheroid are probably very old, and their abundances can be interpreted as due to the fast chemical enrichment of the early Galactic bulge.…
The Gaia-ESO Survey: Preparing the ground for 4MOST & WEAVE galactic surveys. Chemical evolution of lithium with machine learning
S. Nepal, G. Guiglion, R. S. de Jong +21
With its origin coming from several sources (Big Bang, stars, cosmic rays) and given its strong depletion during its stellar lifetime, the lithium element is of great interest as i…
A new stellar chemo-kinematic relation reveals the merger history of the Milky Way disc
I. Minchev, C. Chiappini, M. Martig +27
The velocity dispersions of stars near the Sun are known to increase with stellar age, but age can be difficult to determine so a proxy like the abundance of alpha elements (e.g.,…
Stellar Evolution in the Early Universe
R. Hirschi, U. Frischknecht, F. -K. Thielemann +5
Massive stars played a key role in the early evolution of the Universe. They formed with the first halos and started the re-ionisation. It is therefore very important to understand…
Chemical trends in the Galactic Halo with APOGEE data
E. Fernández-Alvar, L. Carigi, C. Allende Prieto +10
The galaxy formation process in the -Cold Dark Matter scenario can be constrained from the analysis of stars in the Milky Way's halo system. We examine the variation of chemica…
Velocity and abundance precisions for future high-resolution spectroscopic surveys: a study for 4MOST
E. Caffau, A. Koch, L. Sbordone +19
In preparation for future, large-scale, multi-object, high-resolution spectroscopic surveys of the Galaxy, we present a series of tests of the precision in radial velocity and chem…
Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE
B. Barbuy, H. Ernandes, A. C. S. Friaça +25
We have previously studied several elements in 58 selected bulge spheroid stars, based on spectral lines in the H-band. We now derive the abundances of the less-studied elements ph…
Abundance-age relations with red clump stars in open clusters
L. Casamiquela, C. Soubiran, P. Jofré +8
Context: Precise chemical abundances coupled with reliable ages are key ingredients to understand the chemical history of our Galaxy. Open Clusters (OCs) are useful for this purpos…
Abundance gradient slopes versus mass in spheroids: predictions by monolithic models
A. Pipino, A. D'Ercole, C. Chiappini +1
We investigate whether it is possible to explain the wide range of observed gradients in early type galaxies in the framework of monolithic models. To do so, we extend the set of h…
Yule-Simpson's paradox in Galactic Archaeology
I. Minchev, G. Matijevic, D. W. Hogg +7
Simpson's paradox, or Yule-Simpson effect, arises when a trend appears in different subsets of data but disappears or reverses when these subsets are combined. We describe here sev…
Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid
R. Razera, B. Barbuy, T. C. Moura +19
The central part of the Galaxy host a multitude of stellar populations, including the spheroidal bulge stars, stars moved to the bulge through secular evolution of the bar, inner h…
OCCASO III. Iron peak and elements of 18 open clusters. Comparison with chemical evolution models and field stars
L. Casamiquela, S. Blanco-Cuaresma, R. Carrera +10
The study of open-cluster chemical abundances provides insights on stellar nucleosynthesis processes and on Galactic chemo-dynamical evolution. In this paper we present an extended…
The Gaia-ESO Survey: Chemical evolution of Mg and Al in the Milky Way with Machine-Learning
M. Ambrosch, G. Guiglion, Å . Mikolaitis +14
We aim to prepare the machine-learning ground for the next generation of spectroscopic surveys, such as 4MOST and WEAVE. Our goal is to show that convolutional neural networks can…
4MOST Consortium Survey 4: Milky Way Disc and Bulge High-Resolution Survey (4MIDABLE-HR)
T. Bensby, M. Bergemann, J. Rybizki +21
The signatures of the formation and evolution of a galaxy are imprinted in its stars. Their velocities, ages, and chemical compositions present major constraints on models of galax…
The Gaia-ESO Survey: Separating disk chemical substructures with cluster models
A. Rojas-Arriagada, A. Recio-Blanco, P. de Laverny +24
(Abridged) Recent spectroscopic surveys have begun to explore the Galactic disk system outside the solar neighborhood on the basis of large data samples. In this way, they provide…
Probabilistic fibre-to-target assignment algorithm for multi-object spectroscopic surveys
E. Tempel, P. Norberg, T. Tuvikene +22
Context. Several new multi-object spectrographs are currently planned or under construction that are capable of observing thousands of Galactic and extragalactic objects simultaneo…
4MOST Survey Strategy Plan
G. Guiglion, C. Battistini, C. P. M. Bell +30
The current status of and motivation for the 4MOST Survey Strategy, as developed by the Consortium science team, are presented here. Key elements of the strategy are described, suc…
The relationship between mono-abundance and mono-age stellar populations in the Milky Way disk
I. Minchev, M. Steinmetz, C. Chiappini +4
Studying the Milky Way disk structure using stars in narrow bins of [Fe/H] and [alpha/Fe] has recently been proposed as a powerful method to understand the Galactic thick and thin…
The PLATO 2.0 Mission
H. Rauer, C. Catala, C. Aerts +159
PLATO 2.0 has recently been selected for ESA's M3 launch opportunity (2022/24). Providing accurate key planet parameters (radius, mass, density and age) in statistical numbers, it…
Effects of rotation on the evolution of primordial stars
S. Ekström, G. Meynet, C. Chiappini +2
(Abridged) Rotation has been shown to play a determinant role at very low metallicity, bringing heavy mass loss where almost none was expected. Is this still true when the metallic…
Chronology of our Galaxy from Gaia Colour-Magnitude Diagram-fitting (ChronoGal). I. The formation and evolution of the thin disk from the Gaia Catalogue of Nearby Stars
C. Gallart, F. Surot, S. Cassisi +15
The current major challenge to reconstruct the chronology of the Milky Way (MW) is the difficulty to derive precise stellar ages. CMD-fitting offers an alternative to individual ag…
The Gaia-ESO Survey: Probing the lithium abundances in old metal-rich dwarf stars in the Solar vicinity
M. L. L. Dantas, G. Guiglion, R. Smiljanic +14
We test a scenario in which radial migration could affect the Li abundance pattern of dwarf stars in the solar neighbourhood. This may confirm that the Li abundance in these stars…
Kinematics with Gaia DR2: The Force of a Dwarf
I. Carrillo, I. Minchev, M. Steinmetz +10
We use Gaia DR2 astrometric and line-of-sight velocity information combined with two sets of distances obtained with a Bayesian inference method to study the 3D velocity distributi…
The Milky Way bar and bulge revealed by APOGEE DR16 and Gaia EDR3
A. B. A. Queiroz, C. Chiappini, A. Perez-Villegas +23
We investigate the inner regions of the Milky Way with a sample of unprecedented size and coverage thanks to APOGEE DR16 and Gaia EDR3 data. Our inner Galactic sample has more than…
Galactic archaeology: mapping and dating stellar populations with asteroseismology of red-giant stars
A. Miglio, C. Chiappini, T. Morel +11
Our understanding of how the Galaxy was formed and evolves is severely hampered by the lack of precise constraints on basic stellar properties such as distances, masses, and ages.…
A search for late-type supergiants in the inner regions of the Milky Way
F. Comeron, J. Torra, C. Chiappini +3
We present the results of a narrow-band infrared imaging survey of a narrow strip (12' wide) around the galactic equator between 6 deg and 21 deg of galactic longitude aimed at det…
The impact of radial migration on disk galaxy star formation histories I. Biases in spatially resolved estimates
I. Minchev, K. Attard, B. Ratcliffe +9
Knowledge of the spatially resolved star formation history (SFH) of disk galaxies provides crucial insight into disk assembly, quenching, and chemical evolution. However, most reco…
Deciphering the evolution of the Milky Way discs: Gaia APOGEE Kepler giant stars and the Besançon Galaxy Model
N. Lagarde, C. Reylé, C. Chiappini +13
We investigate the properties of the double sequences of the Milky Way discs visible in the [/Fe] vs [Fe/H] diagram. In the framework of Galactic formation and evolution, we di…
2D chemical evolution model: the impact of galactic disc asymmetries on azimuthal chemical abundance variations
E. Spitoni, G. Cescutti, I. Minchev +5
Galactic disc chemical evolution models generally ignore azimuthal surface density variation that can introduce chemical abundance azimuthal gradients. Recent observations, however…
Abundances of carbon-enhanced metal-poor stars as constraints on their formation
C. J. Hansen, B. Nordstroem, T. T. Hansen +6
An increasing fraction of carbon-enhanced metal-poor (CEMP) stars is found as their iron abundance, [Fe/H], decreases below [Fe/H] = -2.0. The CEMP-s stars have the highest absolut…
UVES analysis of red giants in the bulge globular cluster NGC 6522
B. Barbuy, E. Cantelli, L. Muniz +10
NGC 6522 is a moderately metal-poor bulge globular cluster ([Fe/H]1.0), and it is a well-studied representative among a number of moderately metal-poor blue horizontal bra…
Masses and ages for metal-poor stars: a pilot program combining asteroseismology and high-resolution spectroscopic follow-up of RAVE halo stars
M. Valentini, C. Chiappini, D. Bossini +10
Very metal-poor halo stars are the best candidates for being among the oldest objects in our Galaxy. Samples of halo stars with age determination and detailed chemical composition…
Galactic Archaeology with CoRoT and APOGEE: Creating mock observations from a chemodynamical model
F. Anders, C. Chiappini, T. S. Rodrigues +8
In a companion paper, we have presented the combined asteroseismic-spectroscopic dataset obtained from CoRoT lightcurves and APOGEE infra-red spectra for 678 solar-like oscillating…
Self-similarity in the chemical evolution of galaxies and the delay time distribution of SNe Ia
C. J. Walcher, R. M. Yates, I. Minchev +7
Recent improvements in the age dating of stellar populations and single stars allow us to study the ages and abundance of stars and galaxies with unprecedented accuracy. We here co…
Mg_2-sigma in Early-Type Galaxies and Spiral Bulges
C. Chiappini, P. S. Pellegrini, C. Rite +9
We analyze new measurements of the Mg_2 central line strength index and velocity dispersion (sigma) for the galaxies of the ENEAR survey. The observations are now complete (da Cost…
The RAdial Velocity Experiment (RAVE): Parameterisation of RAVE spectra based on convolutional neural networks
G. Guiglion, G. Matijevic, A. B. A. Queiroz +22
In the context of large spectroscopic surveys of stars, data-driven methods are key in deducing physical parameters for millions of spectra in a short time. Convolutional neural ne…
The Gaia-ESO Survey: Revisiting the Li-rich giant problem
A. R. Casey, G. Ruchti, T. Masseron +48
The discovery of lithium-rich giants contradicts expectations from canonical stellar evolution. Here we report on the serendipitous discovery of 20 Li-rich giants observed during t…
Chemodynamical evolution of the Milky Way disk I: The solar vicinity
I. Minchev, C. Chiappini, M. Martig
[Abridged] In this first paper of this series, we present a new approach for studying the chemo-dynamical evolution in disk galaxies, which consists of fusing disk chemical evoluti…
A new method for estimating the pattern speed of spiral structure in the Milky Way
T. C. Junqueira, C. Chiappini, J. R. D. Lépine +2
In the last few decades many efforts have been made to understand the effect of spiral arms on the gas and stellar dynamics in the Milky Way disc. One of the fundamental parameters…
Evolution of the first stellar generations
R. Hirschi, A. Maeder, G. Meynet +2
Although the theoretical study of very low metallicity (Z) and metal-free stars is not new, their importance has recently greatly increased since two related fields have been devel…
Parameters for > 300 million Gaia stars: Bayesian inference vs. machine learning
F. Anders, A. Khalatyan, A. B. A. Queiroz +2
The Gaia Data Release 3 (DR3), published in June 2022, delivers a diverse set of astrometric, photometric, and spectroscopic measurements for more than a billion stars. The wealth…
The role of neutron star mergers in the chemical evolution of the Galactic halo
G. Cescutti, D. Romano, F. Matteucci +2
Aims. We explore the problem of the site of production of Eu. We use also the information present in the observed spread in the Eu abundances in the early Galaxy, not only its aver…
From the bulge to the outer disc: StarHorse stellar parameters, distances, and extinctions for stars in APOGEE DR16 and other spectroscopic surveys
A. B. A. Queiroz, F. Anders, C. Chiappini +27
We combine high-resolution spectroscopic data from APOGEE-2 Survey Data Release 16 (DR16) with broad-band photometric data from several sources, as well as parallaxes from {\it Gai…
Chemical gradients in the Milky Way from the RAVE data. I. Dwarf stars
C. Boeche, A. Siebert, T. Piffl +20
Aim: We aim at measuring the chemical gradients of the elements Mg, Al, Si, and Fe along the Galactic radius to provide new constraints on the chemical evolution models of the Gala…
The Evolution of Carbon and Oxygen in the Bulge and Disk of the Milky Way
G. Cescutti, F. Matteucci, A. McWilliam +1
The evolution of C and O abundances in the Milky Way can impose strong constraints on stellar nucleosynthesis and help understanding the formation and evolution of our Galaxy. The…
PLATO as it is: a legacy mission for Galactic archaeology
A. Miglio, C. Chiappini, B. Mosser +102
Deciphering the assembly history of the Milky Way is a formidable task, which becomes possible only if one can produce high-resolution chrono-chemo-kinematical maps of the Galaxy.…
AMAZE. I. The evolution of the mass-metallicity relation at z>3
R. Maiolino, T. Nagao, A. Grazian +16
We present initial results of an ESO-VLT large programme (AMAZE) aimed at determining the evolution of the mass-metallicity relation at z>3 by means of deep near-IR spectroscopy. G…
Abundances in the Galactic bulge: results from planetary nebulae and giant stars
C. Chiappini, S. Gorny, G. Stasinska +1
Our understanding of the chemical evolution of the Galactic bulge requires the determination of abundances in large samples of giant stars and planetary nebulae (PNe). We discuss P…
4MOST: Project overview and information for the First Call for Proposals
R. S. de Jong, O. Agertz, A. Agudo Berbel +335
We introduce the 4-metre Multi-Object Spectroscopic Telescope (4MOST), a new high-multiplex, wide-field spectroscopic survey facility under development for the four-metre-class Vis…
Abundance patterns in early-type galaxies: is there a 'knee' in the [Fe/H] vs. [alpha/Fe] relation?
C. J. Walcher, P. R. T. Coelho, A. Gallazzi +3
Early-type galaxies (ETGs) are known to be enhanced in alpha elements, in accordance with their old ages and short formation timescales. In this contribution we aim to resolve the…
OCCASO II. Physical parameters and Fe abundances of Red Clump stars in 18 Open Clusters
L. Casamiquela, R. Carrera, S. Blanco-Cuaresma +13
Open Clusters have long been used to study the chemo-dynamical evolution of the Galactic disk. This requires an homogeneously analysed sample covering a wide range of ages and dist…
Abundance gradients in the Milky Way for alpha elements, Iron peak elements, Barium, Lanthanum and Europium
G. Cescutti, F. Matteucci, P. Francois +1
We model the abundance gradients in the disk of the Milky Way for several chemical elements (O, Mg, Si, S, Ca, Sc, Ti, Co, V, Fe, Ni, Zn, Cu, Mn, Cr, Ba, La and Eu), and compare ou…
Galactic Archaeology with asteroseismology and spectroscopy: Red giants observed by CoRoT and APOGEE
F. Anders, C. Chiappini, T. S. Rodrigues +42
With the advent of the space missions CoRoT and Kepler, it has become feasible to determine precise asteroseismic masses and ages for large samples of red-giant stars. In this pape…
4MOST Consortium Survey 3: Milky Way Disc and Bulge Low-Resolution Survey (4MIDABLE-LR)
C. Chiappini, I. Minchev, E. Starkenburg +35
The mechanisms of the formation and evolution of the Milky Way are encoded in the orbits, chemistry and ages of its stars. With the 4MOST MIlky way Disk And BuLgE Low-Resolution Su…
Differential population studies using asteroseismology: solar-like oscillating giants in CoRoT fields LRc01 and LRa01
A. Miglio, C. Chiappini, T. Morel +12
Solar-like oscillating giants observed by the space-borne satellites CoRoT and Kepler can be used as key tracers of stellar populations in the Milky Way. When combined with additio…