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Table 6
Elemental abundances in member stars of IC 4756 and Arcturus.
| El./Star | 12 | 38 | 42 | 69 | 81 |
|---|---|---|---|---|---|
| [C/Fe] | − 0.23 ± 0.01 (02) | − 0.23 ± 0.03 (02) | − 0.29 ± 0.02 (02) | – | − 0.29 ± 0.02 (02) |
| [N/Fe] | 0.45 ± 0.06 (08) | 0.43 ± 0.03 (08) | 0.45 ± 0.04 (08) | – | 0.42 ± 0.05 (07) |
| [O/Fe] | 0.01 | 0.09 | − 0.10 | – | − 0.05 |
| C/N | 0.83 | 0.87 | 0.72 | – | 0.78 |
| 12C∕13C | 19 | 20 | – | – | 17 |
 |
0.23 ± 0.04 (03) | 0.17 ± 0.01 (02) | 0.25 ± 0.02 (03) | 0.33 ± 0.04 (03) | 0.19 ± 0.02 (03) |
 |
0.15 ± 0.07 (03) | 0.06 ± 0.02 (02) | 0.17 ± 0.04 (03) | 0.24 ± 0.08 (03) | 0.10 ± 0.06 (03) |
| [Mg/Fe] | 0.08 ± 0.04 (02) | 0.11 ± 0.01 (02) | 0.15 ± 0.05 (02) | 0.05 ± 0.04 (02) | − 0.02 (01) |
| [Al/Fe] | 0.10 ± 0.01 (02) | 0.00 ± 0.02 (02) | 0.01 ± 0.08 (02) | 0.00 ± 0.07 (02) | 0.03 ± 0.08 (02) |
| [Si/Fe] | 0.00 ± 0.07 (16) | 0.05 ± 0.08 (19) | 0.05 ± 0.06 (19) | 0.01 ± 0.06 (17) | − 0.01 ± 0.05 (18) |
| [Ca/Fe] | 0.06 ± 0.09 (06) | 0.13 ± 0.08 (08) | 0.11 ± 0.10 (07) | 0.10 ± 0.08 (07) | 0.10 ± 0.06 (08) |
| [Sc II/Fe] | − 0.08 ± 0.05 (07) | 0.03 ± 0.02 (07) | − 0.06 ± 0.05 (07) | − 0.02 ± 0.05 (07) | 0.00 ± 0.06 (06) |
| [Ti I/Fe] | − 0.02 ± 0.04 (13) | 0.00 ± 0.04 (16) | − 0.02 ± 0.04 (14) | − 0.01 ± 0.04 (15) | 0.01 ± 0.05 (14) |
| [Ti II/Fe] | − 0.11 ± 0.07 (05) | − 0.01 ± 0.02 (05) | − 0.10 ± 0.05 (05) | − 0.04 ± 0.07 (05) | − 0.08 ± 0.04 (05) |
| [Cr/Fe] | 0.08 ± 0.05 (08) | 0.02 ± 0.07 (09) | 0.03 ± 0.06 (09) | 0.05 ± 0.08 (10) | 0.01 ± 0.07 (10) |
| [Mn/Fe] | − 0.08 ± 0.02 (03) | − 0.02 ± 0.01 (03) | − 0.09 ± 0.05 (03) | − 0.07 ± 0.06 (03) | − 0.19 ± 0.02 (03) |
| [Co/Fe] | − 0.02 ± 0.03 (08) | − 0.03 ± 0.03 (08) | − 0.07 ± 0.02 (08) | − 0.03 ± 0.03 (08) | − 0.07 ± 0.02 (08) |
| [Ni/Fe] | − 0.08 ± 0.09 (24) | − 0.06 ± 0.07 (26) | − 0.06 ± 0.10 (25) | − 0.06 ± 0.08 (26) | − 0.07 ± 0.07 (21) |
| [Y/Fe] | − 0.05 ± 0.14 (05) | 0.08 ± 0.09 (05) | 0.02 ± 0.05 (05) | 0.06 ± 0.08 (05) | − 0.01 ± 0.08 (05) |
| [Zr/Fe] | 0.20 (01) | 0.24 ± 0.14 (02) | 0.17 ± 0.02 (02) | 0.14 ± 0.04 (02) | 0.18 (01) |
| [Ba/Fe] | 0.20 (01) | 0.23 (1) | 0.24 (1) | 0.30 (01) | 0.22 (01) |
| [La/Fe] | 0.20 ± 0.02 (03) | 0.23 ± 0.05 (03) | 0.14 ± 0.02 (03) | 0.19 ± 0.03 (02) | 0.23 ± 0.04 (03) |
| [Ce/Fe] | 0.21 ± 0.10 (02) | 0.27 ± 0.11 (02) | 0.18 ± 0.07 (02) | 0.17 ± 0.06 (02) | 0.18 ± 0.04 (02) |
| [Pr/Fe] | 0.21 ± 0.03 (02) | 0.18 ± 0.07 (02) | 0.10 ± 0.01 (02) | 0.14 ± 0.06 (02) | 0.16 ± 0.02 (02) |
| [Nd/Fe] | 0.08 ± 0.06 (05) | 0.14 ± 0.06 (05) | 0.03 ± 0.06 (05) | 0.13 ± 0.04 (05) | 0.11 ± 0.07 (05) |
| [Eu/Fe] | 0.02 (01) | 0.11 (01) | 0.03 (01) | 0.04 (01) | 0.03 (01) |
| El./Star | 101 | 109 | 125 | 164 | Arcturus |
| [C/Fe] | − 0.23 ± 0.03 (02) | − 0.24 ± 0.05 (02) | − 0.26 (01) | − 0.28 ± 0.02 (02) | 0.03 ± 0.01 (02) |
| [N/Fe] | 0.46 ± 0.04 (07) | 0.47 ± 0.03 (08) | 0.46 ± 0.05 (08) | 0.45 ± 0.03 (08) | 0.29 ± 0.02 (08) |
| [O/Fe] | 0.05 | 0.02 | 0.02 | 0.02 | 0.55 |
| C/N | 0.81 | 0.78 | 0.76 | 0.74 | 2.19 |
| 12C ∕13C | – | – | 17 | 20 | 7 |
| [Na/Fe]LTE | 0.19 ± 0.06 (03) | 0.24 ± 0.04 (03) | 0.19 ± 0.04 (03) | 0.22 ± 0.02 (03) | 0.20 ± 0.05 (03) |
| [Na/Fe]NLTE | 0.11 ± 0.11 (03) | 0.16 ± 0.09 (03) | 0.11 ± 0.01 (03) | 0.14 ± 0.03 (03) | 0.16 ± 0.06 (03) |
| [Mg/Fe] | 0.03 ± 0.05 (02) | 0.04 ± 0.02 (02) | 0.11 ± 0.01 (02) | 0.14 ± 0.02 (02) | 0.43 ± 0.01 (02) |
| [Al/Fe] | 0.01 ± 0.05 (02) | 0.05 ± 0.04 (02) | 0.07 ± 0.04 (02) | 0.06 ± 0.01 (02) | 0.43 ± 0.07 (03) |
| [Si/Fe] | 0.06 ± 0.07 (18) | 0.08 ± 0.08 (17) | 0.06 ± 0.06 (18) | 0.07 ± 0.07 (17) | 0.25 ± 0.04 (18) |
| [Ca/Fe] | 0.09 ± 0.06 (07) | 0.16 ± 0.09 (07) | 0.12 ± 0.08 (07) | 0.12 ± 0.06 (08) | 0.18 ± 0.06 (08) |
| [Sc II/Fe] | 0.01 ± 0.06 (06) | 0.01 ± 0.07 (07) | 0.03 ± 0.07 (07) | 0.01 ± 0.06 (07) | 0.15 ± 0.04 (07) |
| [Ti I/Fe] | − 0.04 ± 0.04 (13) | 0.01 ± 0.05 (12) | 0.02 ± 0.05 (15) | 0.01 ± 0.04 (13) | 0.27 ± 0.05 (16) |
| [Ti II/Fe] | 0.02 ± 0.06 (05) | 0 ± 0.05 (05) | − 0.02 ± 0.02 (05) | − 0.04 ± 0.04 (05) | 0.23 ± 0.05 (04) |
| [Cr/Fe] | − 0.01 ± 0.04 (09) | 0.00 ± 0.07 (09) | 0.01 ± 0.06 (10) | 0.04 ± 0.06 (09) | − 0.03 ± 0.07 (10) |
| [Mn/Fe] | − 0.06 ± 0.05 (03) | − 0.07 ± 0.06 (03) | − 0.02 ± 0.03 (03) | − 0.04 ± 0.07 (03) | − 0.18 ± 0.08 (03) |
| [Co/Fe] | − 0.06 ± 0.03 (08) | − 0.01 ± 0.03 (08) | − 0.02 ± 0.02 (08) | − 0.04 ± 0.04 (08) | 0.2 ± 0.03 (08) |
| [Ni/Fe] | − 0.05 ± 0.07 (25) | − 0.05 ± 0.08 (24) | − 0.04 ± 0.05 (24) | − 0.03 ± 0.05 (26) | 0.02 ± 0.09 (24) |
| [Y/Fe] | 0.06 ± 0.10 (05) | 0.03 ± 0.10 (05) | 0.09 ± 0.06 (05) | 0.02 ± 0.12 (05) | − 0.08 ± 0.16 (05) |
| [Zr/Fe] | 0.11 ± 0.10 (02) | 0.22 ± 0.08 (02) | 0.21 ± 0.07 (02) | 0.19 ± 0.04 (02) | − 0.02 ± 0.11 (02) |
| [Ba/Fe] | 0.25 (01) | 0.18 ± 0 (1) | 0.23 (01) | 0.18 (01) | − 0.22 (01) |
| [La/Fe] | 0.27 ± 0.03 (03) | 0.24 ± 0.03 (03) | 0.26 ± 0.01 (02) | 0.24 ± 0.01 (03) | 0.07 ± 0.05 (03) |
| [Ce/Fe] | 0.21 ± 0.06 (02) | 0.24 ± 0.11 (02) | 0.24 ± 0.08 (02) | 0.21 ± 0.07 (02) | − 0.10 ± 0.11 (02) |
| [Pr/Fe] | 0.19 ± 0.03 (02) | 0.22 ± 0.06 (02) | 0.22 ± 0.04 (02) | 0.19 ± 0.01 (02) | 0.19 ± 0.04 (02) |
| [Nd/Fe] | 0.16 ± 0.07 (05) | 0.16 ± 0.03 (05) | 0.15 ± 0.06 (05) | 0.13 ± 0.05 (05) | − 0.08 ± 0.04 (05) |
| [Eu/Fe] | 0.10 (01) | 0.08 (01) | 0.13 (01) | 0.14 (01) | 0.38 (01) |
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