The radial metallicity gradient and the history of elemental enrichment in M 81 through emission-line probes

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Volume 567 (July 2014)

A&A, 567 (2014) A88

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Table 6

Radial metallicity gradients and means.

Element	Probe	Sample	N	Slope	Intercept	Mean
				[dex kpc^-1 ]	log(X/H)+12	log(X/H)+12

N	HII	GMOS,MMT	27	−0.067^a	8.07	7.62 ± 0.048
N	PNe	MMT^b	14	−0.049^a	7.843	7.545 ± 0.059
O	HII	GMOS,MMT	28	−0.088 ± 0.013^c	9.202 ± 0.107	8.522 ± 0.049
O	PNe	MMT	17	−0.044 ± 0.007^c	8.59 ± 0.062	8.379 ± 0.068
Ne^d	HII	MMT	6	...	...	7.979 ± 0.117
Ne^d	PNe	MMT	6	...	...	7.813 ± 0.103
Ar	HII	GMOS,MMT	23	−0.037 ± 0.016	6.27 ± 0.143	6.21 ± 0.057
Ar^d	MMT	PNe	4	...	...	6.077 ± 0.144

Notes.

^(a)

Fitexy gives q = 0, slope calculated with least square method instead.

^(b)

Note that MMT samples of both PNe and HII regions are slightly different from those of Stanghellini et al. (2010), since two PNe have been newly classified as HII regions;

^(c)

Fitexy gives q = 0.051 for HII regions, 0.053 for PNe;

^(d)

Sample on restricted domain, inadequate for calculating gradients.

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