Table 2
Properties of the open clusters for which abundances of Na and Al in giants are available.
| Name | Age | [Fe/H] | M TO | RV | # of |
| (Gyr) | (dex) | (M⊙) | (km s-1) | giants | |
|
|
|||||
| NGC 6705 | 0.316 | +0.01 ± 0.06 | 3.2 | +34.5 | 22 |
| NGC 4815 | 0.630 | −0.02 ± 0.04 | 2.5 | −30.2 | 4 |
| Berkeley 81 | 0.980 | +0.25 ± 0.08 | 2.2 | +47.6 | 13 |
| Trumpler 20 | 1.660 | +0.09 ± 0.08 | 1.8 | −40.5 | 40 |
| NGC 2243 | 3.5 | −0.44 ± 0.05 | 1.2 | +59.5 | 18 |
| Berkeley 25 | 4.5 | −0.27 ± 0.02 | 1.15 | +135.2 | 6 |
Notes. The mean cluster [Fe/H] values are given together with the standard deviation. The cluster RV is the mean of the giants that we consider to be cluster members. Thus, it can be slightly different from the values adopted to establish membership that are discussed in the text.
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