The C/O ratio at low metallicity: constraints on early chemical evolution from observations of Galactic halo stars

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Table 1:

The IDs and atmospheric parameters (effective temperature, gravity and iron content) of the halo stars observed. Our sample includes 28 stars from the 2001 UVES run and having [Fe/H] < -1. For such objects $T_{\rm {eff}}$ was re-determined by us consistently with the rest of the sample.
ID	$T_{\rm {eff}}$	log g	[Fe/H]
UVES (2001)
BD-13 $^{\circ}$ 3442	6366	3.99	-2.69
CD-30 $^{\circ}$ 18140	6272	4.12	-1.89
CD-35 $^{\circ}$ 14849	6294	4.26	-2.34
CD-42 $^{\circ}$ 14278	6085	4.39	-2.03
G011-044	6178	4.35	-2.03
G013-009	6343	4.01	-2.29
G018-039	6093	4.19	-1.46
G020-008	6194	4.29	-2.19
G024-003	6084	4.23	-1.62
G029-023	6194	4.04	-1.69
G053-041	5993	4.22	-1.29
G064-012	6435	4.26	-3.24
G064-037	6432	4.24	-3.08
G066-030^*	6470	4.29	-1.48
G126-062^*	6224	4.11	-1.55
G186-026	6417	4.42	-2.54
HD 106038	6027	4.36	-1.37
HD 108177	6156	4.28	-1.71
HD 110621	6157	4.08	-1.59
HD 140283	5849	3.72	-2.38
HD 160617	6047	3.84	-1.75
HD 179626	5881	4.02	-1.12
HD 181743	6044	4.39	-1.87
HD 188031	6234	4.16	-1.72
HD 193901	5699	4.42	-1.10
HD 194598	6020	4.30	-1.15
HD 215801	6071	3.83	-2.28
LP815-43	6483	4.21	-2.71
UVES (2004)
CD-24 17504	6338	4.32	-3.21
CD-71 1234^*	6325	4.18	-2.38
CS 22943-0095	6349	4.18	-2.24
G004-037	6308	4.25	-2.45
G048-029^**	6482	4.25	-2.60
G059-027^*	6272	4.23	-1.93
G126-052	6396	4.20	-2.21
G166-054	6407	4.28	-2.58
HD 84937	6357	4.07	-2.11
HD 338529	6373	4.03	-2.26
LP635-014	6367	4.11	-2.39
LP651-004	6371	4.20	-2.63
MIKE (2003)
G041-041	6440	4.06	-2.66
G048-029^**	6489	4.25	-2.61
G084-029	6302	4.05	-2.62
LP831-70	6232	4.36	-2.93

^* Single-lined spectroscopic binary stars. ^** This star was observed
in both the UVES (2004) and MIKE (2003) runs.

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