280 citations · 1k across the 15 of their papers we have counts for
15 papers
An old, metal-rich accreted stellar component in the Milky Way stellar disk
Diane K. Feuillet, Sofia Feltzing, Christian Sahlholdt +1
We study the possibility that the Milky Way's cool stellar disc includes mergers with ancient stars. Galaxies are understood to form in a hierarchical manner, where smaller (proto-…
Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
Christian L. Sahlholdt, Sofia Feltzing, Diane K. Feuillet
We provide a detailed map of the ages and metallicities of turnoff stars in the Milky Way disc based on data from GALAH DR3 and Gaia EDR3. From this map, we identify previously und…
The BAyesian STellar Algorithm (BASTA): a fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
V. Aguirre Børsen-Koch, J. L. Rørsted, A. B. Justesen +16
We introduce the public version of the BAyesian STellar Algorithm (BASTA), an open-source code written in {\tt Python} to determine stellar properties based on a set of astrophysic…
Selecting accreted populations: metallicity, elemental abundances, and ages of the Gaia-Sausage-Enceladus and Sequoia populations
Diane K. Feuillet, Christian L. Sahlholdt, Sofia Feltzing +1
Identifying stars found in the Milky Way as having formed in situ or accreted can be a complex and uncertain undertaking. We use Gaia kinematics and APOGEE elemental abundances to…
Estimating the age-metallicity distribution of a stellar sample from the probability distributions of the individual stars
Christian L. Sahlholdt, Lennart Lindegren
Estimating age distributions, or star formation histories, of stellar populations in the Milky Way is important in order to study the evolution of trends in elemental abundances an…
The HR 1614 moving group is not a dissolving cluster
Iryna Kushniruk, Thomas Bensby, Sofia Feltzing +3
The HR 1614 overdensity in velocity space and has for a long time been known as an old (~2 Gyr) and metal-rich ([Fe/H]~0.2) nearby moving group that has a dissolving cluster origin…
The GALAH survey: Multiple stars and our Galaxy. I. A comprehensive method for deriving properties of FGK binary stars
G. Traven, S. Feltzing, T. Merle +24
Binary stellar systems form a large fraction of the Galaxy's stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be corre…
The SkyMapper-Gaia RVS view of the Gaia-Enceladus-Sausage -- an investigation of the metallicity and mass of the Milky Way's last major merger
Diane K Feuillet, Sofia Feltzing, Christian Sahlholdt +1
We characterize the Gaia-Enceladus-Sausage kinematic structure recently discovered in the Galactic halo using photometric metallicities from the SkyMapper survey, and kinematics fr…
Characteristics of the two sequences seen in the high-velocity Hertzsprung-Russell diagram in Gaia DR2
Christian L. Sahlholdt, Luca Casagrande, Sofia Feltzing
In this study we use a sample of about 9 million SkyMapper stars with metallicities to investigate the properties of the two stellar populations seen in the high-velocity ($V_{\rm…
The Gaia-ESO survey: Calibrating a relationship between Age and the [C/N] abundance ratio with open clusters
G. Casali, L. Magrini, E. Tognelli +51
In the era of large high-resolution spectroscopic surveys, high-quality spectra can contribute to our understanding of the Galactic chemical evolution, providing chemical abundance…
Benchmark ages for the Gaia benchmark stars
Christian L. Sahlholdt, Sofia Feltzing, Lennart Lindegren +1
In the era of large-scale surveys of stars in the Milky Way, stellar ages are crucial for studying the evolution of the Galaxy. But determining ages of field stars is notoriously d…
Asteroseismic radii of dwarfs: New accuracy constraints from Gaia DR2 parallaxes
Christian L. Sahlholdt, Victor Silva Aguirre
Precise stellar masses and radii can be determined using asteroseismology, but their accuracy must be tested against independent estimates. Using radii derived from Gaia DR2 parall…
Testing Asteroseismic Radii of Dwarfs and Subgiants with Kepler and Gaia
C. L. Sahlholdt, V. Silva Aguirre, L. Casagrande +2
We test asteroseismic radii of Kepler main-sequence and subgiant stars by deriving their parallaxes which are compared with those of the first Gaia data release. We compute radii b…
Confirming chemical clocks: asteroseismic age dissection of the Milky Way disk(s)
V. Silva Aguirre, M. Bojsen-Hansen, D. Slumstrup +22
Investigations of the origin and evolution of the Milky Way disk have long relied on chemical and kinematic identification of its components to reconstruct our Galactic past. Diffi…
Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
Daniel Huber, Joel Zinn, Mathias Bojsen-Hansen +17
We present a comparison of parallaxes and radii from asteroseismology and Gaia DR1 (TGAS) for 2200 Kepler stars spanning from the main sequence to the red giant branch. We show tha…