| Element | BD+30 3639 | NGC 6543 | Sun1 | O, B Stars2 | ||||
| Present abun. | AH3 | Present abun. | Mid4 | HA5 | ||||
| Helium | 0.021 | 0.118 | 0.11 | 0.130 | 0.098 | |||
| Carbon (-4) | 7.3 | 3.60 | 2.5 | 7.6 | 2.5 | 3.55 | 1.74 | |
| Nitrogen (-4) | 1.1 | 1.16 | 2.3 | 0.84 | 1.2 | 0.93 | 0.65 | |
| Oxygen (-4) | 4.6 | 3.78 | 5.5 | 6.4 | 4.7 | 4.90 | 4.17 | |
| Neon (-4) | 1.9 | >0.018 | 1.9 | 1.6 | 1.0 | 1.20 | 1.23 | |
| Sulfur (-5) | 0.64 | 0.71 | 1.3 | 0.8 | 1.86 | 1.23 | ||
| Chlorine (-7) | 1.4 | 1.44 | 2.0 | 1.6 | 1.86 | 1.86 | ||
| Argon (-6) | 5.2 | >0.2 | 4.2 | 3.0 | 3.63 | |||
|
1 Solar abundance from Grevesse & Noels (1993) and Anders & Grevesse (1989),
except the oxygen abundance that has been taken from Allende Prieto et al. (2001). 2 O, B star abundances are the average of Gies & Lambert (1992) and Killian-Montenbruck et al. (1994). 3 From Aller & Hyung (1995). 4 From Middlemass et al. (1989). 5 From Hyung et al. (2000). |