Table 2.
Mean metallicity ([Fe/H], in dex, top) and mean alpha over iron ([α/M], in dex, bottom) of the different portions of the Sgr stream as defined in Fig. 5.
| APOGEE | LAMOST | SEGUE | |
|---|---|---|---|
| [Fe/H] | |||
| Trail | −0.95 ± 0.04 | −0.85 ± 0.02 | −1.13 ± 0.02 |
| Lead | −1.23 ± 0.04 | −1.16 ± 0.02 | −1.42 ± 0.02 |
| Lead/bright | −1.20 ± 0.05 | −1.13 ± 0.03 | −1.35 ± 0.02 |
| Lead/faint | −1.27 ± 0.06 | −1.21 ± 0.03 | −1.53 ± 0.03 |
| [α/M] | |||
| Trail | 0.04 ± 0.01 | – | – |
| Lead | 0.07 ± 0.01 | – | – |
| Lead/bright | 0.06 ± 0.01 | – | – |
| Lead/faint | 0.08 ± 0.02 | – | – |
Notes. Each column corresponds to a different spectroscopic survey. We only use the stars with Prob(Sgr|
,
) > 0.2. The bright branch is defined as P(A|
,
) > 0.2 while, for the faint, we use P(B|
,
) > 0.2. The errors given correspond to the error of the mean. By comparing the LAMOST and SEGUE samples, we derive an uncertainty floor of 0.14 dex.
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