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Table 7
Mean iron abundance of low-mass stars, velocity dispersion, and age range of the Orion subgroups.
| SFR | [Fe/H] | Reference | # stars | δ Vrad | Reference | Age | Reference |
| (km s-1) | (Myr) | ||||||
|
|
|||||||
| σ Ori | −0.02 ± 0.09 | González-Hernández et al. (2008) | 8 | 0.9 | Sacco et al. (2008) | 2–3 | Walter et al. (2008) |
| ONC | −0.13 ± 0.03 | Biazzo et al. (2011) | 10 | 3.1 | Fürész et al. (2009) | 2–3 | Da Rio et al. (2010) |
| OB1b | −0.05 ± 0.05 | Biazzo et al. (2011) | 4 | 1.9 | Briceño et al. (2007) | 4–6 | Briceño et al. (2007) |
| OB1a/25 Ori | −0.08 ± 0.15 | Biazzo et al. (2011) | 1 | ~2 | Briceño et al. (2007) | 7–10 | Briceño et al. (2005) |
| 25 Ori | −0.05 ± 0.05 | This work | 5 | 1.7 | Briceño et al. (2007) | 7–10 | Briceño et al. (2005) |
| λ Ori | 0.01 ± 0.01 | This work | 5 | 0.5 | Sacco et al. (2008) | 5–10 | Dolan & Mathieu (2002) |
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