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Home All issues Volume 506 / No 1 (October IV 2009) A&A, 506 1 (2009) 203-211 Full HTML
   

Table 3:

Error sources for the abundances of the chemical elements in HD 49933.
Ion abundance $\sigma_{\rm abn}$ (scatt.) $\sigma_{\rm abn}$ ( $T_{{\rm eff}}$) $\sigma_{\rm abn}$ ( \ensuremath{\log g}) $\sigma_{\rm abn}$ ( $\upsilon _{{\rm mic}}$) $\sigma_{\rm abn}$ (tot)
$\log (N/N_{\rm tot})$ (dex) (dex) (dex) (dex) (dex)
             
           
C I -3.74 0.10 -0.02 0.05 0.00 0.11
O I -3.55   -0.03 0.05 0.00 0.12
Na I -6.15 0.05 0.02 0.00 -0.01 0.05
Mg I -4.83 0.07 0.03 -0.01 -0.02 0.08
Mg II -4.73   -0.02 0.05 -0.01 0.11
Al I -6.20   0.02 0.00 0.00 0.10
Si I -4.86 0.21 0.01 0.00 -0.01 0.21
Si II -4.82 0.02 -0.03 0.05 -0.02 0.07
S I -5.23 0.07 -0.01 0.04 0.00 0.08
Ca I -6.01 0.11 0.03 -0.01 -0.05 0.12
Ca II -6.01 0.09 -0.02 0.05 -0.01 0.11
Sc II -9.24 0.12 0.02 0.05 -0.05 0.14
Ti I -7.54 0.07 0.03 0.00 -0.02 0.08
Ti II -7.42 0.12 0.01 0.05 -0.05 0.16
V I -8.50 0.13 0.04 0.00 -0.01 0.15
V II -8.47 0.23 0.01 0.05 -0.01 0.15
Cr I -6.82 0.17 0.04 0.00 -0.02 0.18
Cr II -6.61 0.17 0.00 0.05 -0.03 0.19
Mn I -7.33 0.14 0.03 0.00 -0.03 0.15
Fe I -5.04 0.06 0.04 -0.01 -0.04 0.13
Fe II -5.03 0.08 0.01 0.05 -0.05 0.12
Co I -7.49 0.10 0.03 0.00 0.00 0.10
Ni I -6.34 0.10 0.03 0.00 -0.02 0.11
Cu I -8.65 0.07 0.03 0.00 -0.01 0.08
Zn I -8.12 0.06 0.02 0.01 -0.04 0.08
Sr I -9.65   0.03 0.00 0.00 0.10
Sr II -9.50 0.04 0.01 0.06 -0.01 0.07
Y II -10.34 0.10 0.02 0.05 -0.02 0.12
Zr II -9.85 0.06 0.01 0.05 -0.01 0.08
Ba II -10.06 0.19 0.03 0.02 -0.07 0.16
La II -11.21 0.11 0.03 0.06 0.00 0.14
Ce II -10.73 0.10 0.03 0.05 0.00 0.12
Nd II -10.77 0.28 0.02 0.05 -0.01 0.28
Sm II -11.09 0.16 0.03 0.05 0.00 0.17
Eu II -11.92 0.10 0.03 0.05 0.00 0.12
Gd II -11.16 0.09 0.03 0.05 0.00 0.15
Dy II -11.36 0.15 0.03 0.05 0.00 0.16


Column 3 gives the standard deviation $\sigma_{\rm abn}$ (scatt.) of the mean abundance obtained from different spectral lines (internal scatter); a blank means that the number of spectral lines is <2, hence no internal scatter could be estimated. (Note that these values are identical to those given in Table 1). Columns 4-6 give the variation in abundance estimated by increasing $T_{{\rm eff}}$ by 50 K, \ensuremath{\log g} by 0.15 dex, and $\upsilon _{{\rm mic}}$ by 0.2 km s-1, respectively. Column 7 gives the the mean error calculated applying standard error propagation theory on the uncertainties given in the previous columns, i.e., $\sigma_{\rm abn}^2$ (tot) = $\sigma_{\rm abn}^2$ (scatt.) + $\sigma_{\rm abn}^2$ ( $T_{{\rm eff}}$) + $\sigma_{\rm abn}^2$ ( \ensuremath{\log g}) + $\sigma_{\rm abn}^2$ ( $\upsilon _{{\rm mic}}$). For the computation of $\sigma_{\rm abn}^2$ (tot) of those ions for which the internal scatter could not be measured, we have assumed a priori $\sigma_{\rm abn}~{\rm (scatt.)} = 0.10$ dex.


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