Ricardo P. Schiavon
YOU?
Author Swipe
View article: The Apache Point Observatory extra-Galactic Evolution Experiment (APOeGEE): Chemical Abundance Trends for Seven Dwarf Spheroidal Galaxies in the APOGEE Survey
The Apache Point Observatory extra-Galactic Evolution Experiment (APOeGEE): Chemical Abundance Trends for Seven Dwarf Spheroidal Galaxies in the APOGEE Survey Open
In addition to comprehensive surveys of the Milky Way bulge, disk, and halo, the Apache Point Galactic Evolution Experiment (APOGEE) project observed seven dwarf spheroidal satellites (dSphs) of the Milky Way: Carina, Sextans, Sculptor, Dr…
View article: Hidden Figures of Globular Clusters: Integrated Stellar Populations Impacted by Hot Subdwarfs
Hidden Figures of Globular Clusters: Integrated Stellar Populations Impacted by Hot Subdwarfs Open
Globular clusters (GCs) are fundamental for understanding the integrated light of old stellar populations and galaxy assembly processes. However, the role of hot, evolved stars, such as horizontal branch (HB), extreme HB, and blue straggle…
View article: Is Liller 1 a building block of the Galactic bulge? -- Evidence with APOGEE
Is Liller 1 a building block of the Galactic bulge? -- Evidence with APOGEE Open
Liller 1 is a stellar system orbiting within the inner 0.8kpc of the Galactic centre, characterised by a wide spread in age and metallicity, indicating a high mass. Liller 1 has been proposed to be a major contributor to the stellar mass o…
View article: Measuring and modelling the Splash with APOGEE/<i>Gaia</i> and ARTEMIS
Measuring and modelling the Splash with APOGEE/<i>Gaia</i> and ARTEMIS Open
Using combined data from SDSS-IV/APOGEE and Gaia, we study the chemo-dynamical properties of the Splash population in comparison with those of the high-$\alpha$ disc. We investigate a wide range of abundance ratios, finding that the Splash…
View article: Tidal Debris Candidates from the <i>ω</i> Centauri Accretion Event and Its Role Building Up the Milky Way Halo
Tidal Debris Candidates from the <i>ω</i> Centauri Accretion Event and Its Role Building Up the Milky Way Halo Open
We identify stellar tidal debris from the ω Centauri ( ω Cen) system among field stars in the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey via chemical tagging using a neural network trained on APOGEE observations…
View article: Measuring and modelling the Splash with APOGEE/Gaia and ARTEMIS
Measuring and modelling the Splash with APOGEE/Gaia and ARTEMIS Open
Using combined data from SDSS-IV/APOGEE and Gaia, we study the chemo-dynamical properties of the Splash population in comparison with those of the high-alpha disc. We investigate a wide range of abundance ratios, finding that the Splash di…
View article: Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE
Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE Open
Context . 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 phosphorus (P; Z=15), sulphur (S; Z=16), and potass…
View article: Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE
Abundances of P, S, and K in 58 bulge spheroid stars from APOGEE Open
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 phosphorus (P; Z=15), sulphur (S; Z=16), and potassium (K; Z=…
View article: Modelling the density and mass of the Milky Way’s proto-galaxy components with <i>APOGEE-Gaia</i>
Modelling the density and mass of the Milky Way’s proto-galaxy components with <i>APOGEE-Gaia</i> Open
Unravelling galaxy formation theory requires understanding galaxies both at high and low redshifts. A possible way to connect both realms is by studying the oldest stars in the Milky Way (i.e. the proto-Galaxy). We use the APOGEE-Gaia surv…
View article: Modelling the density and mass of the Milky Way's proto-galaxy components with $APOGEE$-$Gaia$
Modelling the density and mass of the Milky Way's proto-galaxy components with $APOGEE$-$Gaia$ Open
Unravelling galaxy formation theory requires understanding galaxies both at high and low redshifts. A possible way to connect both realms is by studying the oldest stars in the Milky Way (i.e., the proto-Galaxy). We use the $APOGEE$-$Gaia$…
View article: Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE
Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE Open
Context. 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 abundances of the iron-peak elements are impor…
View article: Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE
Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE Open
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 abundances of the iron-peak elements are important trac…
View article: Carbon enrichment in APOGEE disk stars as evidence of mass transfer in binaries
Carbon enrichment in APOGEE disk stars as evidence of mass transfer in binaries Open
Carbon abundances in first-ascent giant stars are usually lower than those of their main-sequence counterparts. At moderate metallicities, stellar evolution of single stars cannot account for the existence of red-giant branch stars with en…
View article: Carbon enrichment in APOGEE disk stars as evidence of mass transfer in binaries
Carbon enrichment in APOGEE disk stars as evidence of mass transfer in binaries Open
Context. Carbon abundances in first-ascent giant stars are usually lower than those of their main-sequence counterparts. At moderate metallicities, stellar evolution of single stars cannot account for the existence of red-giant branch star…
View article: Realistic simulated galaxies form [α/Fe]–[Fe/H] knees due to a sustained decline in their star formation rates
Realistic simulated galaxies form [α/Fe]–[Fe/H] knees due to a sustained decline in their star formation rates Open
We examine the stellar [$\alpha$/Fe]–[Fe/H] distribution of $\simeq 1000$ present-day galaxies in a high-resolution EAGLE simulation. Roughly half of the galaxies exhibit the canonical distribution, characterized by a sequence of low-metal…
View article: Signature of systemic rotation in 21 galactic globular clusters from APOGEE-2
Signature of systemic rotation in 21 galactic globular clusters from APOGEE-2 Open
Context. Traditionally, globular clusters (GCs) have been assumed to be quasi-relaxed non-rotating systems, characterized by spherical symmetry and orbital isotropy. However, in recent years, a growing set of observational evidence has bee…
View article: On the mass assembly history of the Milky Way: clues from its stellar halo
On the mass assembly history of the Milky Way: clues from its stellar halo Open
Stellar halos of galaxies retain crucial clues to their mass assembly history. It is in these galactic components that the remains of cannibalised galactic building blocks are deposited. For the case of the Milky Way, the opportunity to an…
View article: Signature of systemic rotation in 21 Galactic Globular Clusters from APOGEE-2
Signature of systemic rotation in 21 Galactic Globular Clusters from APOGEE-2 Open
Context. Traditionally, Globular Clusters (GCs) have been assumed to be quasi-relaxed non-rotating systems, characterized by spherical symmetry and orbital isotropy. However, in recent years, a growing set of observational evidence is unve…
View article: A Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEE
A Perspective on the Milky Way Bulge Bar as Seen from the Neutron-capture Elements Cerium and Neodymium with APOGEE Open
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 Galactic bulge bar spatially contained within ∣ X Gal ∣ < 5 kpc, ∣ Y G…
View article: A perspective on the Milky Way Bulge-Bar as seen from the neutron-capture elements Cerium and Neodymium with APOGEE
A perspective on the Milky Way Bulge-Bar as seen from the neutron-capture elements Cerium and Neodymium with APOGEE Open
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 $\sim$2000 stars in the Galactic Bulge/bar spatially contained within $|X_{Gal}|<$5 kpc, …
View article: Realistic simulated galaxies form [$α$/Fe]-[Fe/H] knees due to a sustained decline in their star formation rates
Realistic simulated galaxies form [$α$/Fe]-[Fe/H] knees due to a sustained decline in their star formation rates Open
We examine the stellar [$α$/Fe]-[Fe/H] distribution of $\simeq1000$ present-day galaxies in a high-resolution EAGLE simulation. A slight majority of galaxies exhibit the canonical distribution, characterised by a sequence of low-metallicit…
View article: The APOGEE Value Added Catalogue of Galactic globular cluster stars
The APOGEE Value Added Catalogue of Galactic globular cluster stars Open
We introduce the SDSS/APOGEE Value Added Catalogue of Galactic Globular Cluster (GC) Stars. The catalogue is the result of a critical search of the APOGEE data release 17 (DR17) catalogue for candidate members of all known Galactic GCs. Ca…
View article: The APOGEE value-added catalogue of Galactic globular cluster stars
The APOGEE value-added catalogue of Galactic globular cluster stars Open
We introduce the Sloan Digital Sky Survey (SDSS)/ Apache Point Observatory Galactic Evolution Experiment (APOGEE) value-added catalogue of Galactic globular cluster (GC) stars. The catalogue is the result of a critical search of the APOGEE…
View article: Light elements Na and Al in 58 bulge spheroid stars from APOGEE
Light elements Na and Al in 58 bulge spheroid stars from APOGEE Open
We identified a sample of 58 candidate stars with metallicity [Fe/H] ≲ −0.8 that likely belong to the old bulge spheroid stellar population, and analyse their Na and Al abundances from Apache Point Observatory Galactic Evolution Experiment…
View article: A Comparative Analysis of the Chemical Compositions of Gaia-Enceladus/Sausage and Milky Way Satellites using APOGEE
A Comparative Analysis of the Chemical Compositions of Gaia-Enceladus/Sausage and Milky Way Satellites using APOGEE Open
We use data from the 17th data release of the Apache Point Observatory Galactic Evolution Experiment (APOGEE 2) to contrast the chemical composition of the recently discovered Gaia Enceladus/Sausage system (GE/S) to those of ten Milky Way …
View article: A comparative analysis of the chemical compositions of Gaia-Enceladus/Sausage and Milky Way satellites using APOGEE
A comparative analysis of the chemical compositions of Gaia-Enceladus/Sausage and Milky Way satellites using APOGEE Open
We use data from the 17th data release of the Apache Point Observatory Galactic Evolution Experiment (APOGEE 2) to contrast the chemical composition of the recently discovered Gaia Enceladus/Sausage system (GE/S) to those of 10 Milky Way (…
View article: Chemically characterising the Milky Way’s stellar halo
Chemically characterising the Milky Way’s stellar halo Open
Galactic haloes in a Λ-CDM universe are predicted to host today a swarm of debris resulting from cannibalised dwarf galaxies. The chemo-dynamical information recorded in their stellar populations helps elucidate their nature, constraining …
View article: Correction to: The contribution of N-rich stars to the Galactic stellar halo using APOGEE red giants
Correction to: The contribution of N-rich stars to the Galactic stellar halo using APOGEE red giants Open
This is a correction to the paper 'The contribution of N-rich stars to the Galactic stellar halo using APOGEE red giants' (
View article: The chemical characterization of halo substructure in the Milky Way based on APOGEE
The chemical characterization of halo substructure in the Milky Way based on APOGEE Open
Galactic haloes in a Λ-CDM universe are predicted to host today a swarm of debris resulting from cannibalized dwarf galaxies. The chemodynamical information recorded in their stellar populations helps elucidate their nature, constraining t…
View article: Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid
Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid Open
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 halo, inner thick disk, inner thin disk, as well as debris f…