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Table 1
Summary table for the selection of the APOGEE HQ Giant Sample.
| Parameter | Requirement | Notes |
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|
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| S / N | >70/pixel | |
| σ(vlos) | ≤1 km s-1 | no RV-identified binaries |
| APOGEE_STARFLAG bits | ∉ { 0, 1, 3 } | no commissioning data or obviously bad spectra |
| APOGEE_TARGET1 bits | ∉ { 10, 15, 16, 18, 19, 23, 24 } | avoid, e.g., extended objects, M31 clusters, M dwarfs |
| APOGEE_TARGET2 bits | ∉ { 4, 9, 10, 13, 15, 16, 17 } | avoid, e.g., sky fibres, telluric standards, known cluster members |
| ASPCAP χ2 | <25 | |
| T eff | ∈ {3800 K, 5200 K} | avoid too low temperatures |
| log g | ∈ { 0.5 dex, 3.8 dex } | select red giant stars |
| [M/H] | ∈ {−1.0, 0.45 } | avoid low metallicities |
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