Abundances in planetary nebulae: NGC 2792 | Astronomy & Astrophysics (A&A)

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Table 6:

Ionic concentrations and chemical abundances in NGC 2792.
Ion	$\lambda$	Int./H $\beta$	T	$N_{{\rm ion}}$ / $N_{{\rm p}}$	ICF	$N_{{\rm el.}}$ / $N_{{\rm p}}$
He⁺	5875	3.0	15 000	0.017
He⁺⁺	4686	97	16 000	0.0855	1	0.103
C⁺⁺	1909	520	14 500	9.5(-5)
C⁺³	1548	290	17 000	1.5(-5)	1	1.1(-4)
N⁺	6584	4.4:	13 000	4.0(-7)
N⁺⁺	1750	60.1	15 500	4.1(-5)
N⁺³	1485	79	17 000	2.6(-5)	1	6.8(-5)
O⁺	3727	9	13 000	1.8(-6)
O⁺⁺	5007	960	15 000	1.03(-4)
O⁺⁺	1663	69	15 000	1.50(-4)
O⁺³	25,9	298	18 000	7.7(-5)	1	2.1(-4)
Ne⁺	12.8	1.1	15 000	1.1(-6)
Ne⁺⁺	15.5	46.9	16 000	2.46(-5)
Ne⁺⁺	3869	67.8	16 000	1.44(-5)
Ne⁺³	2424	191.0	18 000	3.29(-5)
Ne⁺⁴	14.3	92.6	18 000	5.8(-6)	1	6.5(-5)
S⁺	6731	1.8	13 000	5.0(-8)
S⁺⁺	6312	1.8	15 000	7.7(-7)
S⁺⁺	18.7	10.5	15 000	8.04(-7)
S⁺³	10.5	108	16 000	2.37(-6)	1.3	4.3(-6)
Ar⁺⁺	8.99	8.06	15 000	6.11(-7)
Ar⁺⁺	7135	9.3	15 000	3.6(-7)
Ar⁺³	4740	8.2	16 000	6.3(-7)
Ar⁺⁴	7005	3.2	18 000	2.2(-7)
Ar⁺⁴	7.90	5.96	18 000	2.04(-7)	1.1	1.6(-6)
Cl⁺⁺	5538	0.5	15 000	2.4(-8)
Cl⁺³	11.8	0.894	16 000	4.0(-8)	1.4	0.90(-7)
Mg⁺⁴	5.60	11.6	18 000	2.3(-6)	4:	1.0(-5):
Si⁺	34.8	0.275	13 000	1.1(-7)	20:	2(-6):

Intensities given with respect to ${\rm H}\beta =100$ . (:) Indicates uncertain values.
Note: Wavelength in Angstrom for all values of $\lambda$ above 1000, otherwise in $\mu$ m.

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