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Table 1.
Details of the latest data releases of the APOGEE, GALAH, and Gaia−ESO sky survey programs.
| APOGEE | GALAH | GES | |
|---|---|---|---|
| DR17 | DR3 | DR5 | |
| Date of data release | December 2021 | November 2020 | May 2017 |
| Number of stars | 733 901 | 588 571 | 114 324 |
| Telescope | Sloan Foundation at APO, 2.5 m NMSU at APO, 1 m | Anglo-Australian Telescope at Siding Spring Observatory, 3.9 m | ESO Telescopes at the La Silla Paranal Observatory |
| du Pont telescope at LCO, 2.5 m | |||
| Wavelength range | 15 140−16 940 Å | 4 optical bands: | Multiple ranges |
| 4713−4903 Å, 5648−5873 Å | from 4033 Å to 9001 Å | ||
| 6478−6737 Å, 7585−7887 Å | |||
| Resolution | ∼22 500 | ∼28 000 | ∼16 000 − 26 000, 47 000 |
| List of parameters | Teff, log g, vrad, [M/H], [α/Fe], [Fe/H], vmicro, v sin i(giants: vmac) | Teff, log g, vrad, [Fe/H], [α/Fe], vmicro, vbroad | Teff, log g, vrad, [Fe/H], vmicro, v sin i |
| List of elements | C I, N, O, Na, Mg, Al, Si, P, S, K, Ca, Ti, Ti II, V, Cr, Mn, Co, Ni, Cu, Ge, Ce, Nd | Li, C, O, Na, Mg, Al, Si, K, Ca, Sc I, Ti, Ti II, V, Cr, Cr II, Mn, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Mo, Ru, Ba II, La II, Ce II, Nd II, Sm II, Eu II | He, Li, C I-III, N II-III, O I-II, Ne, Na, Mg, Al I-II, Si I-IV, S, Ca I-II, Sc I-II, Ti, Ti II, V, Cr I-II, Mn, Co, Ni, Cu, Zn, Sr, Y II, Zr I-II, Mo, Ba II, La II, Ce II, Pr II, Nd II, Sm II, Eu II |
| Calibration | Calibrated Teff, log g, [M/H], [α/M], abundance parameters | Calibrated abundance parameters | Gaia benchmark stars and calibrating clusters |
| Method of deriving parameters | ASPCAP (parameters and abundances) | Spectrum synthesis (SME and The Cannon) | Equivalent widths, comparisons of observed spectra and a grid of templates (strategy: WGs) |
| Model atmospheres | Kurucz model (Cannon models), all-MARCS grid (Teff < 8000 K) | MARCS grid (plane parallel models for log g > 4, spherical models for log g < 4) | MARCS grid |
| 1D/3D | Spherical (Turbospectrum) or plane parallel (Synspec) | 1D spherical | 1D spherical |
| LTE/NLTE | LTE/NLTE | LTE/NLTE | |
| Spectral synthesis code | Turbospectrum (for the main spectral grids), Synspec | Spectroscopy Made Easy (SME) | e.g. Turbospectrum, SME, MOOG, COGs |
| 1D/3D | Plane parallel and spherical | 1D spherical | |
| LTE/NLTE | LTE/NLTE | LTE/NLTE | LTE |
| Solar reference table | Grevesse et al. (2007) | Buder et al. (2021) | Grevesse et al. (2007) |
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