CNO abundances and carbon isotope ratios in evolved stars of the open clusters NGC 2324, NGC 2477, and NGC 3960

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Volume 595 (November 2016)

A&A, 595 (2016) A16

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Table 4

Determined abundances and isotopic ratios of the target stars.

Star	[C/H]	σ [C/H]	[N/H]	σ [N/H]	[O/H]	C/N	¹²C/¹³C

				NGC 2324
850	−0.47	0.02	0.16	0.06	−0.39	0.93
2603^∗	−0.57	0.06	0.08	0.08	−0.42	0.89	22
2225	−0.52	0.01	0.10	0.03	−0.37	0.95
1006	−0.45	0.02	0.16	0.04	−0.22	0.98	20
1992^∗	−0.53	0.02	0.21	0.06	−0.22	0.72	20
1788	−0.60	0.06	−0.05	0.02	−0.44	1.12
2027	−0.53	0.04	0.14	0.06	−0.53	0.85	20

Average	−0.52 ± 0.05		0.11 ± 0.08		−0.37 ± 0.10	0.92 ± 0.12	21 ± 1

				NGC 2477
13385	−0.20	0.02	0.39	0.02	−0.09	1.02	18
4221	−0.21	0.01	0.44	0.01	−0.03	0.89	20
5035	−0.19	0.03	0.51	0.05	−0.07	0.79
3206	−0.20	0.04	0.49	0.06	0.05	0.81	20
2061	−0.19	0.01	0.41	0.06	−0.09	1.00
8039	−0.12	0.01	0.52	0.05	0.03	0.91	20

Average	−0.19± 0.03		0.46 ± 0.05		−0.03± 0.06	0.91 ± 0.09	20 ± 1

				NGC 3960
310755	−0.37	0.02	0.23	0.05	−0.13	1.00
310756	−0.33	0.02	0.44	0.03	−0.16	0.68	12
310757	−0.47	0.02	0.31	0.05	−0.25	0.66	10
310758	−0.35	0.03	0.33	0.03	−0.17	0.83	20
310760	−0.38	0.01	0.35	0.02	−0.25	0.74	16
310761	−0.32	0.04	0.34	0.04	−0.08	0.87	18

Average	−0.37± 0.05		0.33 ± 0.07		−0.17± 0.07	0.80 ± 0.13	16 ± 4

Notes. Carbon abundances were determined from two lines. Nitrogen abundances from 3 to 8 lines, and oxygen abundance from a single line.

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