Astronomy & Astrophysics

All Figures

$\begin{figure} \par\includegraphics[width=11.5cm,clip]{5516fig1.eps}\end{figure}$ Figure 1: a) $12+\log$ O/H as a function of log $\rm Ar _3O_3$ . Red: HII regions from the spiral galaxies sample; blue: HeBCD sample; cyan: SDSS DR3 sample. The thick curve represents our calibration defined by Eq. (1). The two thin curves are vertically displaced from the thick one by $\pm$ 0.3 dex. b) Same for $12+\log$ O/H as a function of log $\rm S _3O_3$ . The thick curve represents our calibration defined by Eq. (2).
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In the text

$\begin{figure} \par\includegraphics[width=5.3cm,clip]{5516fig2.eps}\end{figure}$ Figure 2: log $\rm A_3O_3$ versus the electron temperature measured from the [O III] $\lambda$ 4363/5007 ratio. Blue: HeBCD sample; cyan: SDSS DR3 sample. The curve shows the logarithm of the [Ar III] $\lambda$ 7135/[O III] $\lambda$ 5007 emissivity ratio at the temperature given by the abscissa (the curve has been shifted for easier comparison with observational points).
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In the text

$\begin{figure} \par\includegraphics[width=11.5cm,clip]{5516fig3.eps}\end{figure}$ Figure 3: a) $12+\log$ O/H vs. log $\rm N_2$ for our data sample. The thick curve represents Eq. (3). b) $12+\log$ O/H vs. log $\rm O_3N_2$ . The dashed line shows the PP04 calibration. The thick line is our proposed calibration (Eq. (4)). The thin curves are vertically displaced from the thick one by $\pm$ 0.3 dex.
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In the text

$\begin{figure} \par\includegraphics[width=11.5cm,clip]{5516fig4.eps}\end{figure}$ Figure 4: a) $12+\log$ O/H derived from $\rm Ar _3O_3$ (Eq. (1)) vs. $12+\log$ O/H derived from $\rm S _3O_3$ (Eq. (2)). b) $12+\log$ O/H derived from $\rm Ar _3O_3$ (Eq. (1)) vs. $12+\log$ O/H derived from $\rm N_2$ using the formula of PP04 (Eq. (3)). The black lines show the 1:1 relations.
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In the text

$\begin{figure} \par\includegraphics[width=5.3cm,clip]{5516fig2.eps}\end{figure}$	Figure 2: log $\rm A_3O_3$ versus the electron temperature measured from the [O III] $\lambda$ 4363/5007 ratio. Blue: HeBCD sample; cyan: SDSS DR3 sample. The curve shows the logarithm of the [Ar III] $\lambda$ 7135/[O III] $\lambda$ 5007 emissivity ratio at the temperature given by the abscissa (the curve has been shifted for easier comparison with observational points).
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$\begin{figure} \par\includegraphics[width=11.5cm,clip]{5516fig3.eps}\end{figure}$	Figure 3: a) $12+\log$ O/H vs. log $\rm N_2$ for our data sample. The thick curve represents Eq. (3). b) $12+\log$ O/H vs. log $\rm O_3N_2$ . The dashed line shows the PP04 calibration. The thick line is our proposed calibration (Eq. (4)). The thin curves are vertically displaced from the thick one by $\pm$ 0.3 dex.
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$\begin{figure} \par\includegraphics[width=11.5cm,clip]{5516fig4.eps}\end{figure}$	Figure 4: a) $12+\log$ O/H derived from $\rm Ar _3O_3$ (Eq. (1)) vs. $12+\log$ O/H derived from $\rm S _3O_3$ (Eq. (2)). b) $12+\log$ O/H derived from $\rm Ar _3O_3$ (Eq. (1)) vs. $12+\log$ O/H derived from $\rm N_2$ using the formula of PP04 (Eq. (3)). The black lines show the 1:1 relations.
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