TOPoS

Abstract

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The GALAH Survey: chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+ DR3 andGaiaeDR3

“…The discrepancy of different GSE selections was already discussed by Bonifacio et al (2021), as they also found lower metallicities than Naidu et al (2020) and Feuillet et al (2020). While different metallicity scales of the different surveys could be the source of this disagreement, in this work, we demonstrate that the new selection within APOGEE DR16 by Feuillet et al (2021) and the selection by Das et al (2020), but with updated values from APOGEE DR16, show a disagreement.…”

“…Using the same selection as Feuillet et al (2020), but data from the TOPoS Survey, Bonifacio et al (2021) find a lower average metallicity of [M/H] ∼ −1.45 ± 0.3 (estimated by us based on their fig. 20).…”

“…We acknowledge note that different studies are potentially surveying different parts of the GSE (see also the discussion by Bonifacio et al 2021). The overlap between the different studies is currently Table 5.…”

Detailed investigation of two high‐speed evolved Galactic stars

“…Figure 9 presents the position of the two stars (blue triangle and orange square for TYC 622–742–1 and TYC 1193–1918–1, respectively) in planes used to isolate GSE, employing Galactocentric cylindrical velocities (, , , top panels), the vertical component of the angular momentum (, bottom panels), the orbital energy ( E , bottom‐right panel), and the radial action (its square root , bottom‐left panel). As a reference sample, stars of the “good parallax” sub‐sample analyzed in Bonifacio et al (2021) are also plotted in gray scale. The red‐shaded area in the bottom‐left panel corresponds to the criteria defined in Feuillet et al (2020) to select GSE stars, namely −500 kpc kpc and .…”

“…Bottom panels: position of the target stars in the orbital Energy (right) and (left) versus planes. Stars from the good parallax sample of Bonifacio et al (2021) are shown as black dots. The red‐shaded area in the bottom‐left panel outlines the region defined in Feuillet et al (2020) to select GSE stars.…”