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Table 3

σ and Δ for abundance ratios in each cluster.

El Mean σ a Δ b

Tr20
N (number of member stars) = 13

[Fe/H] 0.17 0.05 0.07
[Si/Fe] –0.02 0.03 0.08
[Ca/Fe] –0.05 0.03 0.08
[Mg/Fe] 0.04 0.03 0.09
[Ti/Fe]c –0.10 0.04 0.08
[Ni/Fe] –0.06 0.05 0.08
[Cr/Fe] –0.08 0.02 0.08

NGC 4815
N (number of member stars) = 5

[Fe/H] 0.03 0.05 0.10
[Si/Fe] –0.02 0.05 0.09
[Ca/Fe] –0.06 0.03 0.09
[Mg/Fe] 0.14 0.10 0.13
[Ti/Fe]a –0.16 0.07 0.08
[Ni/Fe] –0.09 0.02 0.09
[Cr/Fe] –0.15 0.03 0.09

NGC 6705
N (number of member stars) = 21

[Fe/H] 0.14 0.06 0.14
[Si/Fe] 0.03 0.05 0.16
[Ca/Fe] –0.02 0.05 0.14
[Mg/Fe] 0.20 0.09 0.17
[Ti/Fe]a –0.05 0.07 0.14
[Ni/Fe] 0.01 0.03 0.16
[Cr/Fe] –0.07 0.05 0.15

Notes.

(a)

σ is the standard deviation of all elements;

(b)

Δ is the average uncertainty in the abundances (Δ = ⟨δ);

(c)

[Ti/Fe] is computed using only Ti I lines.

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