Table 12: Comparison of the abundance ratios of carbon, nitrogen and oxygen.
BD+30 3639 NGC 6543 Sun O Stars

N/O 0.24 0.42 0.19 0.15

C/O 1.59 0.45 0.72 0.42

$\frac{{\rm (C+N+O)}}{{\rm H}}$ (-4) 13.0 10.3 9.4 6.56

**Table 12:** Comparison of the abundance ratios of carbon, nitrogen and oxygen.
	BD+30 3639	NGC 6543	Sun	O Stars
N/O	0.24	0.42	0.19	0.15
C/O	1.59	0.45	0.72	0.42
$\frac{{\rm (C+N+O)}}{{\rm H}}$ (-4)	13.0	10.3	9.4	6.56

Source LaTeX | All tables | In the text