Impact of the convective mixing-length parameter α on stellar metallicity

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Table 2

Stellar parameters and iron abundances under different models of the field star sample.

Object	T_eff	log g	α^(a)	Ion	N ^(b)	[Fe/H] with error, LTE			[Fe/H] with error, NLTE

	(K)					Old	New	Δ[Fe∕H] ^(c)	Old	New	Δ[Fe∕H] ^(c)
HD 6582	5370	4.51	1.7	Fe I	23	− 0.782 ± 0.057	− 0.790 ± 0.054	−0.008	−0.791 ± 0.061	−0.800 ± 0.061	−0.009
				Fe II	7	− 0.844 ± 0.033	− 0.866 ± 0.040	−0.022	−0.846 ± 0.033	−0.866 ± 0.040	−0.020
HD 10700	5330	4.53	1.8	Fe I	22	− 0.486 ± 0.045	− 0.495 ± 0.045	−0.009	−0.500 ± 0.050	−0.508 ± 0.053	−0.008
				Fe II	8	− 0.542 ± 0.038	− 0.554 ± 0.041	−0.012	−0.541 ± 0.040	−0.554 ± 0.041	−0.013
HD 22049	5045	4.61	2.2	Fe I	22	− 0.051 ± 0.036	− 0.052 ± 0.036	−0.001	−0.070 ± 0.055	−0.074 ± 0.056	−0.004
				Fe II	9	− 0.088 ± 0.033	− 0.080 ± 0.031	0.008	−0.088 ± 0.033	−0.080 ± 0.031	0.008
HD 39587	5960	4.48	1.9	Fe I	16	0.086 ± 0.057	0.083 ± 0.060	−0.003	0.072 ± 0.071	0.068 ± 0.070	−0.004
				Fe II	8	0.148 ± 0.091	0.146 ± 0.086	−0.002	0.148 ± 0.091	0.145 ± 0.084	−0.003
HD 103095	5100	4.59	2.4	Fe I	21	− 1.270 ± 0.039	− 1.274 ± 0.044	−0.004	−1.288 ± 0.042	−1.292 ± 0.050	−0.004
				Fe II	8	− 1.350 ± 0.048	− 1.332 ± 0.049	0.018	−1.349 ± 0.049	−1.332 ± 0.049	0.017
HD 122563	4600	1.60	1.0	Fe I	16	− 2.770 ± 0.078	− 2.791 ± 0.076	−0.021	−2.580 ± 0.094	−2.601 ± 0.094	−0.021
				Fe II	10	− 2.522 ± 0.043	− 2.544 ± 0.046	−0.022	−2.522 ± 0.043	−2.544 ± 0.046	−0.022
HD 217014	5780	4.28	2.0	Fe I	24	0.269 ± 0.042	0.270 ± 0.042	0.001	0.251 ± 0.053	0.251 ± 0.054	0.000
				Fe II	11	0.300 ± 0.071	0.302 ± 0.072	0.002	0.300 ± 0.071	0.302 ± 0.074	0.002
HD 45282	5310	3.07	1.0	Fe I	26	− 1.412 ± 0.043	− 1.433 ± 0.042	−0.021	−1.233 ± 0.085	−1.253 ± 0.081	−0.020
				Fe II	9	− 1.498 ± 0.029	− 1.517 ± 0.026	−0.019	−1.498 ± 0.029	−1.517 ± 0.026	−0.019
HD 140283	5780	3.70	1.7	Fe I	12	− 2.423 ± 0.082	− 2.454 ± 0.072	−0.031	−2.363 ± 0.081	−2.397 ± 0.076	−0.034
				Fe II	2	− 2.375 ± 0.078	− 2.405 ± 0.078	−0.030	−2.375 ± 0.078	−2.405 ± 0.078	−0.030
HD 61421	6524	3.98	1.9	Fe I	18	− 0.073 ± 0.072	− 0.073 ± 0.066	0.000	−0.049 ± 0.062	−0.051 ± 0.057	−0.002
(Proycon)				Fe II	9	− 0.038 ± 0.034	− 0.044 ± 0.037	−0.006	−0.038 ± 0.034	−0.044 ± 0.037	−0.006

Notes. ^(a) New α value derived from W15. ^(b) Number of iron lines used to calculate the abundances. ^(c)Abundance derived from new α value model minus abundance derived from old (fixed) α value.

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