Table 2: The IDs, atmospheric parameters (effective temperature, gravity and iron content) and the LTE abundances for oxygen and carbon for the sample of low-metallicity stars from Akerman et al. (2004) are shown in Cols. 1, 2, 3, 4, 5 and 7 respectively. The corresponding LTE [C/O] values are in Col. 10. Our adopted non-LTE abundance corrections for oxygen and carbon (obtained when neglecting collisions with H  I atoms) and the resulting [O/H] and [C/O] non-LTE abundance ratios from this study are shown in Cols. 6, 8, 9 and 11 respectively. All values from the Akerman et al. study have been corrected, where appropriate, for our different choice of the carbon and oxygen solar abundances ( $\log\epsilon_{\rm C_\odot}=8.39$ and $\log\epsilon_{\rm O_\odot}=8.66$).
Star $T_{\rm {eff}}$ log g [Fe/H] $\log\epsilon_{\rm O}$ $\Delta\!\log\epsilon_{\rm O}$ $\log\epsilon_{\rm C}$ $\Delta\!\log\epsilon_{\rm C}$ [O/H] [C/O] [C/O]
  [K] [cgs] (LTE) (LTE)   (LTE)   (non-LTE) (LTE) (non-LTE)
BD-13$^{\circ}$3442 6500 4.16 -2.61 6.85 -0.18* 6.13 -0.37 -1.99* -0.45 -0.64*
CD-30$^{\circ}$18140 6272 4.13 -1.88 7.55 -0.13 6.72 -0.26 -1.24 -0.56 -0.69
CD-35$^{\circ}$14849 6125 4.11 -2.41 7.12 -0.11 6.40 -0.30 -1.65 -0.45 -0.64
CD-42$^{\circ}$14278 5812 4.25 -2.12 7.42 -0.13 6.62 -0.22 -1.37 -0.53 -0.62
HD 103723 6040 4.26 -0.82 8.34 -0.20 7.63 -0.23 -0.52 -0.44 -0.47
HD 105004 5919 4.36 -0.86 8.26 -0.19 7.75 -0.22 -0.59 -0.24 -0.27
HD 106038 5919 4.30 -1.42 8.08 -0.18 7.40 -0.27 -0.76 -0.41 -0.50
HD 108177 6034 4.25 -1.74 7.80 -0.15 6.94 -0.24 -1.01 -0.59 -0.68
HD 110621 5989 3.99 -1.66 7.95 -0.17 7.06 -0.28 -0.88 -0.62 -0.73
HD 121004 5595 4.31 -0.77 8.71 -0.23 8.05 -0.20 -0.18 -0.39 -0.36
HD 140283 5690 3.69 -2.42 7.11 -0.11 6.34 -0.26 -1.66 -0.50 -0.65
HD 146296 5671 4.17 -0.74 8.53 -0.22 7.96 -0.24 -0.35 -0.30 -0.32
HD 148816 5823 4.14 -0.73 8.65 -0.22 8.02 -0.25 -0.23 -0.36 -0.39
HD 160617 5931 3.77 -1.79 7.42 -0.13 6.74 -0.28 -1.37 -0.41 -0.56
HD 179626 5699 3.92 -1.14 8.46 -0.22 7.62 -0.25 -0.42 -0.57 -0.60
HD 181743 5863 4.32 -1.93 7.66 -0.14 6.82 -0.21 -1.14 -0.57 -0.64
HD 188031 6054 4.03 -1.79 7.75 -0.15 6.87 -0.26 -1.06 -0.61 -0.72
HD 193901 5672 4.38 -1.12 8.16 -0.18 7.41 -0.20 -0.68 -0.48 -0.50
HD 194598 5906 4.25 -1.17 8.19 -0.19 7.48 -0.23 -0.66 -0.44 -0.48
HD 215801 6005 3.81 -2.29 7.22 -0.12 6.34 -0.30 -1.56 -0.61 -0.79
LP815-43 6533 4.25 -2.67 6.61 -0.25* 6.14 -0.39 -2.30* -0.20 -0.34*
G011-044 5995 4.29 -2.09 7.47 -0.13 6.63 -0.22 -1.32 -0.57 -0.66
G013-009 6360 4.01 -2.27 7.15 -0.11 6.47 -0.35 -1.62 -0.41 -0.65
G016-013 5602 4.17 -0.76 8.75$^{\dag }$ -0.20 8.00$^{\dag }$ -0.22 -0.11$^{\dag }$ -0.48 -0.50$^{\dag }$
G018-039 5910 4.09 -1.52 8.12 -0.18 7.29 -0.25 -0.72 -0.56 -0.63
G020-008 5855 4.16 -2.28 7.53 -0.13 6.66 -0.24 -1.26 -0.60 -0.71
G024-003 5910 4.16 -1.67 7.62 -0.14 6.71 -0.22 -1.18 -0.64 -0.72
G029-023 5966 3.82 -1.80 7.79 -0.15 6.85 -0.28 -1.02 -0.67 -0.80
G053-041 5829 4.15 -1.34 7.86 -0.16 7.07 -0.25 -0.96 -0.52 -0.61
G064-012 6511 4.39 -3.17 6.44 -0.30* 5.68 -0.45 -2.52* -0.49 -0.64*
G064-037 6318 4.16 -3.12 6.44 -0.30* 5.72 -0.42 -2.52* -0.45 -0.57*
G066-030 6346 4.24 -1.52 7.93 -0.13 6.93 -0.27 -0.89 -0.73 -0.87
G126-062 5943 3.97 -1.64 7.98 -0.17 7.02 -0.27 -0.85 -0.69 -0.79
G186-026 6273 4.25 -2.62 6.71 -0.15* 6.14 -0.33 -2.10* -0.30 -0.48*
* Note that the O  I  non-LTE abundance corrections for the five most metal-poor stars have been revised with respect to those given in Akerman et al. (2004), as explained in the text. $^{\dag }$ The C and O abundances of G016-013 have been revised by +0.4 dex with respect to those in Akerman et al. (2004), due to the fact that the wrong (hotter) stellar model for HD 160617 was accidentally used in that analysis instead of the correct one for this star (P. E. Nissen, private communication). This affects [O/H] (and [C/H]) but leaves [C/O] intact for this star. We trust that the stellar parameters for this star in Akerman et al. (also given here) have been correctly derived in their analysis.

Source LaTeX | All tables | In the text