Open Access

Table A.2

Definitions for the columns in Table A.1.

Column name details
source_id Gaia DR3 Source ID
RA Right accension in degrees, from APOGEE
DEC Declination in degrees, from APOGEE
TEFF Calibrated effective temperature, from APOGEE
TEFF_ERR Uncertainty for the calibrated effective temperature, from APOGEE
LOGG Calibrated surface gravity, from APOGEE
LOGG_ERR Uncertainty for the calibrated surface gravity, from APOGEE
Visual inspection flag: 0, unanalysable spectrum; 1, useable Mg;
Flag 2, useable Si; 3, useable Mg and Si
Sample Confidence sample flag: 0, unanalysable spectrum; 1, high-confidence sample; 2, low confidence sample
S/N Signal-to-noise ratio measured by APOGEE, per pixel
M_H Weighted [M/H] as calculated in Sect. 3.4
M_H_unc Weighted uncertainty for the weighted [M/H]
Mg_H [Mg/H] as calculated in Sect. 3.4
Mg_H_lower Lower uncertainty estimate for [Mg/H]
Mg_H_upper Upper uncertainty estimate for [Mg/H]
Si_H [Si/H] as calculated in Sect. 3.4
Si_H_lower Lower uncertainty estimate for [Si/H]
Si_H_upper Upper uncertainty estimate for [Si/H]
Lit. spec Stars marked * have a spectroscopic metallicity from the literature sources used in Paper I,
Viswanathan et al. 2024; Matsuno et al. 2024; Buder et al. 2025; Suda et al. 2008
DESI Collaboration 2025; Arentsen et al. 2020; Aguado et al. 2016
Aguado et al. 2019; Deng et al. 2012; Sneden et al. 2000; Fabrizio et al. 2012; Xue et al. 2014
Tan et al. 2014; Walker et al. 2015; Spencer et al. 2018; Reichert et al. 2020; Dietz et al. 2020
Limberg et al. 2021; Shank et al. 2022; Olivares Carvajal et al. 2022; Oh et al. 2023
Region Region of the Local Group the star is assigned to in Paper I: H, halo; I, inner sample RGC < 3.5 kpc Apomean < 5 kpc;
O, outer sample RGC < 3.5 kpc 5 kpc < Apomean < 15 kpc; C, confined sample zmax < 3.5 kpc Apomean > 3.5 kpc;
LMC, Large Magellanic Cloud; SMC, Small Magellanic Cloud; other dwarf galaxies have their names written out
EMP Extremely metal-poor star candidates

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