Table 2
Stellar parameters using b − y photometry and derived abundances for stars in NGC 6752.
| Group | Star ID | Teff | log g | ξ | [Fe/H] ± 1σ | log ε(Mg) | log ε(Sc) | log ε(Ti) | log ε(Ca) | log ε(Ba) |
| (K) | (cgs) | (km s-1) | (dex) | LTE | LTE | LTE | LTE | LTE | ||
|
|
||||||||||
| RGB | 540 | 5000 | 2.54 | 1.50 | −1.65 ± 0.12 | 6.21 ± 0.07 | 1.29 ± 0.10 | 3.43 ± 0.05 | 4.90 ± 0.04 | 0.77 ± 0.03 |
| 548 | 5082 | 2.59 | 1.50 | −1.65 ± 0.12 | 6.02 ± 0.07 | 1.37 ± 0.09 | 3.47 ± 0.06 | 4.98 ± 0.04 | 0.73 ± 0.03 | |
| 566 | 5000 | 2.56 | 1.40 | −1.68 ± 0.02 | 6.22 ± 0.07 | 1.34 ± 0.08 | 3.48 ± 0.05 | 5.00 ± 0.04 | 0.65 ± 0.03 | |
| 574 | 5045 | 2.60 | 1.50 | −1.64 ± 0.08 | 6.25 ± 0.07 | 1.32 ± 0.08 | 3.44 ± 0.06 | 4.96 ± 0.04 | 0.65 ± 0.03 | |
| 581 | 5040 | 2.60 | 1.40 | −1.67 ± 0.11 | 6.24 ± 0.07 | 1.31 ± 0.09 | 3.47 ± 0.07 | 5.01 ± 0.04 | 0.65 ± 0.03 | |
| 588 | 5018 | 2.59 | 1.50 | −1.66 ± 0.05 | 6.16 ± 0.07 | 1.33 ± 0.10 | 3.43 ± 0.05 | 4.99 ± 0.04 | 0.75 ± 0.03 | |
|
|
||||||||||
| RGBmean | ... | 5031 ± 32 | 2.58 ± 0.02 | 1.45 | −1.66 ± 0.04 | 6.22 ± 0.04 | 1.33 ± 0.03 | 3.45 ± 0.02 | 4.97 ± 0.04 | 0.70 ± 0.06 |
|
|
||||||||||
| bRGB | 1406 | 5234 | 3.22 | 1.40 | −1.62 ± 0.05 | 6.24 ± 0.07 | 1.35 ± 0.07 | 3.46 ± 0.06 | 4.99 ± 0.04 | 0.73 ± 0.03 |
| 1483 | 5253 | 3.25 | 1.40 | −1.74 ± 0.04 | 6.18 ± 0.07 | 1.32 ± 0.10 | 3.40 ± 0.09 | 4.90 ± 0.04 | 0.72 ± 0.03 | |
| 1522 | 5288 | 3.28 | 1.40 | −1.67 ± 0.05 | 6.30 ± 0.07 | 1.31 ± 0.09 | 3.45 ± 0.06 | 4.97 ± 0.04 | 0.73 ± 0.03 | |
| 1665 | 5248 | 3.28 | 1.40 | −1.64 ± 0.07 | 6.28 ± 0.07 | 1.28 ± 0.10 | 3.50 ± 0.05 | 4.87 ± 0.05 | 0.72 ± 0.03 | |
|
|
||||||||||
| bRGBmean | ... | 5256 ± 23 | 3.26 ± 0.03 | 1.40 | −1.67 ± 0.03 | 6.25 ± 0.05 | 1.32 ± 0.03 | 3.45 ± 0.03 | 4.93 ± 0.06 | 0.72 ± 0.01 |
|
|
||||||||||
| SGB | 3081 | 5793 | 3.79 | 1.50 | −1.68 ± 0.10 | 6.07 ± 0.10 | 1.21 ± 0.09 | 3.28 ± 0.08 | 4.76 ± 0.07 | 0.48 ± 0.06 |
|
|
||||||||||
| TOP | 3988 | 6089 | 3.99 | 1.95 | −1.79 ± 0.12 | 6.06 ± 0.11 | 5.00 ± 0.10 | 0.91 ± 0.04 | ||
| 4096 | 6196 | 4.03 | 1.95 | −1.73 ± 0.07 | 6.03 ± 0.11 | 5.00 ± 0.10 | 0.45 ± 0.07 | |||
| 4138 | 6049 | 3.98 | 1.95 | −1.67 ± 0.02 | 6.06 ± 0.11 | no reliable | abundances | 4.99 ± 0.10 | 0.43 ± 0.07 | |
| 4383 | 6032 | 3.99 | 1.80 | −1.68 ± 0.07 | 6.13 ± 0.11 | 4.94 ± 0.10 | 0.43 ± 0.07 | |||
| 4428 | 6001 | 3.99 | 1.90 | −1.75 ± 0.08 | 6.10 ± 0.11 | 4.76 ± 0.10 | 0.36 ± 0.07 | |||
|
|
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| TOPmean | ... | 6068 ± 57 | 4.00 ± 0.01 | 2.00 | −1.72 ± 0.07 | 6.08 ± 0.04 | 4.93 ± 0.10 | 0.42 ± 0.04 | ||
|
|
||||||||||
| Δ[TOP-RGB] | ... | 1037 ± 65 | 1.42 ± 0.02 | 0.06 ± 0.08 | 0.14 ± 0.06 | 0.04 ± 0.11 | 0.28 ± 0.07 | |||
| Δ[TOP-bRGB] | ... | 812 ± 61 | 0.74 ± 0.03 | 0.05 ± 0.08 | 0.17 ± 0.06 | 0.00 ± 0.12 | 0.30 ± 0.04 | |||
Notes.All abundances are derived fully differential to the Sun. Uncertainties on stellar parameters correspond to the standard deviations. Uncertainties on abundances correspond to standard deviations in case of the individual stars, and propagated errors (
/
) for the mean values. For Fe we used 5 Fe II lines: 4923, 5197, 5234, 5316, and 5362 Å, for Mg 2 Mg I lines: 5528 and 5711 Å, for Sc we used 3 Sc II lines: 5031, 5526 and 5657 Å, for Ti we used 5 Ti II lines: 5129, 5154, 5185, 5226 and 5336 Å, for Ca, we used the Ca I 6169 and 6493 Å lines and for Ba, only the Ba II at 6141 Å was used since the Ba II at 6496 Å was contaminated by telluric absorption. The average Mg abundance for the RGB group is derived disregarding star 548 and the average Ba abundance for the TOP group is derived by disregarding the Ba-rich star 3988 (see text for details). Note that the Sc abundances for the bRGB and RGB stars can be slightly overestimated due to ignoring HFS.
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