Table 2
Abundance results for α Cen AB and comparison to values in the literature.
| [Eu/H] | [Eu/Fe] | |||||
|---|---|---|---|---|---|---|
| α Cen A | α Cen B | A–B | α Cen A | α Cen B | A–B | |
| This study | ||||||
| Me14 line list | +0.10 ± 0.04 (3) | +0.05 ± 0.06 (3)(a) | +0.05 ± 0.07 (3)(a) | –0.12 ± 0.05 (3) | –0.17 ± 0.07 (3)(a) | +0.05 ± 0.08 (3)(a) |
| Re03 line list | +0.15 ± 0.06 (1) | +0.16 ± 0.08 (1)(a) | –0.01 ± 0.10 (1)(a) | –0.08 ± 0.07 (1) | –0.07 ± 0.09 (1)(a) | –0.01 ± 0.11 (1)(a) |
| Weighted average | +0.12 ± 0.04 (3) | +0.09 ± 0.05 (3)(a) | +0.03 ± 0.06 (3)(a) | –0.11 ± 0.04 (3) | –0.14 ± 0.06 (3)(a) | +0.03 ± 0.07 (3)(a) |
| GCE corrected(b) | ... | ... | ... | –0.10 ± 0.04 (3) | –0.13 ± 0.06 (3)(a) | +0.03 ± 0.07 (3)(a) |
| N97 | +0.15 ± 0.05 (1) | +0.14 ± 0.05 (1) | +0.01 ± 0.08 (1) | –0.10 ± 0.06 (1) | –0.10 ± 0.06 (1) | +0.00 ± 0.09 (1) |
| K02 | ... | +0.11 ± 0.08 (1) | ... | ... | –0.08 ± 0.05 (1) | ... |
| G18 | ... | ... | ... | –0.13 ± 0.14 (3) | –0.03 ± 0.03 (3) | –0.10 ± 0.15 (3) |
Notes. Our recommended values are the weighted average (by the inverse variance) of the results obtained using the Me14 and Re03 line lists. For the analysis based on the single Eu II feature in Re03 line list, we conservatively assumed σint = 0.05 dex. The number in brackets gives the number of lines used. Keywords for literature studies are N97: Neuforge-Verheecke & Magain (1997); K02: Koch & Edvardsson (2002); G18: Guiglion et al. (2018). Note that the last study made use of archival HARPS spectra that are different from ours. (a) These values are affected by likely underestimated abundances in α Cen B at the ~0.05 dex level (see Sect. 3). (b)Computed from the [Eu/Fe]-age relation of Bedell et al. (2018) (see Sect. 4.1 for details). The uncertainty in the slope of the relation was propagated to the abundances.
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