Gary S. Da Costa

Detailed abundance determination of metal-poor stars with X-Shooter – II. Chemically disentangling the halo, disc, and GSE

B.G. Lowe, Luca Casagrande, Thomas Nordlander, Gary S. Da Costa et autres

ABSTRACT We present a detailed chemical analysis of seven extremely metal-poor (EMP) star candidates observed with X-Shooter, combining them with 16 EMP candidates from Paper I. We measured abundances for 16 elements, showing excellent agreement with previously published results. The sample was …

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Detailed Abundance Determination of Metal-Poor Stars with X-Shooter II. - Chemically Disentangling the Halo, Disk and GSE

Benjamin D C Lowe, Luca Casagrande, Thomas Nordlander, Gary S. Da Costa et autres

We present a detailed chemical analysis of seven extremely metal-poor (EMP) star candidates observed with X-Shooter, combining them with 16 EMP candidates from Paper I. We measured abundances for 16 elements, showing excellent agreement with previously published results. The sample was further …

The GALAH survey: Searching for and characterizing halo substructures with the GALAH DR4 survey

Iryna Kushniruk, Kristopher Youakim, KARIN LIND, Sven Buder et autres

Context. Recent studies have revealed that the Milky Way’s stellar halo is a composite of stellar populations of different origins, including multiple accretion events. To better understand how the Milky Way and other spiral galaxies were formed, it is necessary to thoroughly …

se, au, si, us (code pays fourni par la source)

Epicyclic density variations in the Indus stellar stream

G. F. Lewis, Ting S Li, Sarah L. Martell, Denis Erkal et autres

ABSTRACT Longitudinal density fluctuations observed in stellar streams can result from gravitational interactions with massive perturbers in the Milky Way, such as dark matter subhaloes. Analysing these density variations provides a powerful probe of properties (motion, mass, size, etc.) of the perturbing …

au, ca, gb, us, ru, de (code pays fourni par la source)

The GALAH survey: Searching for and characterizing halo substructures with the GALAH DR4 survey

Iryna Kushniruk, Kristopher Youakim, Karin Lind, Sven Buder et autres

Context . Recent studies have revealed that the Milky Way’s stellar halo is a composite of stellar populations of different origins, including multiple accretion events. To better understand how the Milky Way and other spiral galaxies were formed, it is necessary to …

se, au, si, cn, us (code pays fourni par la source)

Epicyclic Density Variations in the Indus Stellar Stream

Yong Yang, Geraint F. Lewis, Ting S. Li, Sarah L. Martell et autres

Longitudinal density fluctuations observed in stellar streams can result from gravitational interactions with massive perturbers in the Milky Way, such as dark matter subhalos. Analysing these density variations provides a powerful probe of properties (motion, mass, size, etc.) of the perturbing objects. …

Searching for and characterizing halo substructures with the GALAH DR4 survey

Iryna Kushniruk, Kristopher Youakim, Karin Lind, Sven Buder et autres

Recent studies show that the Milky Way stellar halo is composed of populations of different origins, shaped by multiple accretion events. To better understand the formation of the Milky Way and other spiral galaxies, we characterize the chemical and kinematic properties of …

Detailed Chemical Abundance Analysis of the Brightest Stars in the Turranburra and Willka Yaku Stellar Streams*

K. B. Webber, T. T. Hansen, J. L. Marshall, Alexander P. Ji et autres

Abstract We present a detailed chemical abundance analysis of the three brightest known stars from each of the Turranburra and Willka Yaku stellar streams using high-resolution Magellan/Magellan Inamori Kyocera Echelle spectra. Abundances for 27 elements, ranging from carbon to dysprosium, were derived. …

Chemodynamics of Boötes I with S 5 : Revised Velocity Gradient, Dark Matter Density, and Galactic Chemical Evolution Constraints

Nathan R. Sandford, Ting S. Li, Sergey E. Koposov, Kohei Hayashi et autres

Abstract We combine new spectroscopic observations of the ultrafaint dwarf (UFD) galaxy Boötes I (Boo I) from the Southern Stellar Stream Spectroscopic Survey ( S 5 ) with ∼15 yr of archival spectroscopic data to create the largest sample of stellar kinematics …