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Table 1

Main parameters and elemental abundances of the programme stars.

Cluster12 Star V B − V Teff log g vt [Fe/H] [C/Fe] [N/Fe] σ3 n4 [O/Fe] C/N 12C/13C
mag mag K km s-1
Cr 261 1045 13.547 1.487 4470 2.07 1.23 0.00 –0.15 0.23 0.05 16 –0.05 1.66 15
Cr 261 1080 13.952 1.435 4500 2.09 1.23 0.00 –0.15 0.26 0.05 10 –0.05 1.58 11
Cr 261 1485 13.680 1.577 4340 1.76 1.27 –0.06 –0.15 0.23 0.05 16 –0.05 1.66 18
Cr 261 1871 12.350 2.060 3980 0.43 1.44 –0.31 –0.10 0.20 0.04 20 –0.20 2.04 18
Cr 261 2001 13.932 1.356 4580 1.83 1.26 –0.02 –0.15 0.20 0.07 10 –0.10 1.66 13
Cr 261 2105 12.908 1.517 4180 1.59 1.29 –0.08 –0.10 0.24 0.06 16 –0.05 1.78 19
NGC 6253 2509 12.685 1.314 4494 2.57 1.42 0.46 –0.17 0.35 0.03 21 –0.10 1.20 15
NGC 6253 2885 12.656 1.352 4490 2.43 1.38 0.43 –0.23 0.33 0.05 21 –0.20 1.12 17
NGC 6253 3595 12.388 1.292 4535 2.44 1.40 0.44 –0.18 0.27 0.04 19 –0.10 1.39 17
NGC 6253 4510 12.759 1.296 4509 2.52 1.38 0.47 –0.20 0.32 0.03 21 –0.17 1.20 15

Notes. 

(1)

Star numbers for the cluster Cr 261 were taken from Phelps et al. (1994) and V, and B − V are from Gozzoli et al. (1996). Star numbers, V, B − V for the cluster NGC 6253 were used from Bragaglia et al. (1997)

(2)

The main atmospheric parameters for the cluster Cr 261 were adopted from Carretta et al. (2005), for the cluster NGC 6253 – determined in this work.

(3)

The standard deviations in the mean value due to the line-to-line scatter.

(4)

The number of CN molecular features used.

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