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Table 4

Adopted stellar parameters for individual stars in NGC 6558, AL 3, and HP 1, and resulting C, N, O abundances.

Name Teff log g [Fe/H] vt [C/Fe] [N/Fe] [O/Fe]
(K) (km s−1)
Program stars

F42 3800 0.5 −1.05 1.65 −0.5 +0.8 +0.5
HP1-5 4525 2.0 −1.07 1.55 −0.1 0.8 0.5
AL3-3 4250 1.7 −1.00 1.2 −0.1 0.0 0.0
AL3-6 4150 1.3 −1.00 1.2 +0.8 +1.0 +0.8
AL3-7 4500 1.5 −1.00 1.2 −0.2 −0.1 0.0

Reference stars

Sun 5770 4.44 +0.00 1.0 +0.00 +0.00 +0.00
Arcturus 4275 1.55 −0.54 1.65 +0.11 +0.40 +0.43
μ Leo 4540 2.3 +0.30 1.3 −0.1 +0.65 +0.00

Notes. For NGC 6558, the stellar parameters are from Barbuy et al. (2007), and for HP 1 they are from Barbuy et al. (2016). Stellar parameters for the Sun, Arcturus, and μ Leo are also included.

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