Table 2.
Baseline SMC metal abundances (X/H by number) adopted with respect to Z⊙ from Magg et al. (2022, MBS22).
| Element | SNR | H II regions |
A stars | B stars |
K supergiants |
⟨SMC⟩ | Solar | ⟨SMC⟩ | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| D19 | KD98 | G99 | R02 | L08 | V99 | K00 | T07/H09 | H97/HBS97 | H99 | X/H | MBS22 | logX/H + 12 | Z⊙ | |
| C | 3.2×10−5 | 1.6×10−5 | 2.5×10−5 | ⋯ | ⋯ | ⋯ | 2.5×10−5 | 2.0×10−5 | 3.6×10−5 | 2.8×10−5 | 2.6×10−5 | 3.6×10−4 | 7.42 | 0.07 |
| N | 6.6×10−6 | 3.6×10−6 | 3.2×10−6 | 6.5×10−6 | ⋯ | (2.1×10−5) | 3.2×10−6 | (1.7×10−5) | (3.2×10−5) | ⋯ | 4.6×10−6 | 9.5×10−5 | 6.66 | 0.05 |
| O | 1.0×10−4 | 1.0×10−4 | 1.0×10−4 | 1.4×10−4 | ⋯ | 1.4×10−4 | 1.4×10−4 | 9.8×10−5 | 1.2×10−4 | ⋯ | 1.1×10−4 | 5.9×10−4 | 8.05 | 0.19 |
| Ne | 1.1×10−5 | 1.6×10−5 | 1.6×10−5 | 2.1×10−5 | 2.2×10−5 | ⋯ | ⋯ | ⋯ | 2.9×10−5 | ⋯ | 1.7×10−5 | 1.4×10−4 | 7.23 | 0.12 |
| Na | ⋯ | ⋯ | ⋯. | ⋯ | ⋯ | ⋯ | ⋯ | 4.0×10−7 | 2.6×10−7 | 3.1×10−7 | 1.9×10−6 | 5.49 | 0.16 | |
| Mg | 5.2×10−6 | ⋯ | ⋯ | ⋯ | ⋯. | 6.7×10−6 | 6.0×10−6 | 5.2×10−6 | 1.1×10−5 | 4.5×10−6 | 6.1×10−6 | 3.5×10−5 | 6.78 | 0.17 |
| Al | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | 3.8×10−7 | ⋯ | 4.6×10−7 | 3.6×10−7 | 3.9×10−7 | 2.7×10−6 | 5.59 | 0.15 |
| Si | 5.9×10−6 | ⋯ | 2.0×10−6 | ⋯ | ⋯ | 9.3×10−6 | 6.9×10−6 | 5.9×10−6 | 5.2×10−6 | 5.6×10−6 | 5.3×10−6 | 3.9×10−5 | 6.72 | 0.14 |
| S | ⋯ | ⋯ | 2.0×10−6 | 2.5×10−6 | 2.3×10−6 | ⋯ | ⋯ | ⋯ | ⋯. | ⋯ | 2.3×10−6 | 1.4×10−5 | 6.36 | 0.16 |
| Cl | 2.3×10−8 | ⋯. | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | 2.3×10−8 | 1.8×10−7 | 4.37 | 0.13 |
| Ar | 5.1×10−7 | ⋯ | 7.9×10−7 | 6.6×10−7 | 9.3×10−7 | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | 7.2×10−7 | 3.2×10−6 | 5.86 | 0.23 |
| Ca | 5.9×10−7 | ⋯ | ⋯ | ⋯ | ⋯ | 2.1×10−7 | ⋯ | ⋯ | 3.9×10−7 | 3.3×10−7 | 4.1×10−7 | 2.3×10−6 | 5.61 | 0.17 |
| Cr | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | 4.6×10−8 | 3.7×10−8 | 4.0×10−8 | 5.5×10−7 | 4.61 | 0.07 |
| Fe | 5.9×10−6 | ⋯ | ⋯ | ⋯ | ⋯ | 5.1×10−6 | 6.6×10−6 | 8.5×10−6 | 6.4×10−6 | 5.1×10−6 | 6.3×10−6 | 3.2×10−5 | 6.80 | 0.20 |
| Ni | 3.5×10−7 | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | ⋯ | 3.4×10−7 | 1.2×10−7 | 2.4×10−7 | 1.7×10−6 | 5.37 | 0.14 |
Notes. Values shown in parentheses are excluded from the average, due to issues with enhancements owing to mixing (e.g. N), depletion on dust grains (Fe) or other concerns. log(P/H)+12 = 4.7 or 0.2 Z⊙ is adopted for P from ISM studies of Tchernyshyov et al. (2015).
References. H97: Hill (1997); HBS97: Hill et al. (1997); KD98: Kurt et al. (1998); G99: Garnett (1999); V99: Venn (1999); H99: Hill (1999); K00: Korn et al. (2000); T07: Trundle et al. (2007); L08: Lebouteiller et al. (2008); H09: Hunter et al. (2009); D19: Dopita et al. (2019).
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