2005A&A...436L...1P

Query : 2005A&A...436L...1P

2005A&A...436L...1P - Astronomy and Astrophysics, volume 436, L1-4 (2005/6-2)

On the relationship between auroral and nebular oxygen line intensities in spectra of HII regions.

PILYUGIN L.S.

Abstract (from CDS):

We investigate relationships between observed auroral and nebular oxygen line fluxes in spectra of HII regions. We find a relation that is metallicity-dependent at low metallicities, but becomes independent of metallicity (within the uncertainties of the available data) above 12+logO/H∼8.25, i.e. there is one-to-one correspondence (the ff-relation) between auroral and nebular oxygen line fluxes in spectra of high-metallicity HII regions. The ff-relation allows one to estimate the flux in the auroral line from strong oxygen line measurements only. This solves the problem of the electron temperature (and, consequently, abundance) determination in high-metallicity HII regions. The ff-relation confirms the basic idea of the ``empirical'' method, proposed by Pagel et al. (1979MNRAS.189...95P) a quarter of a century ago, that the oxygen abundance in HII region can be esimated from the strong oxygen lines measurements only.

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Journal keyword(s): galaxies: ISM - ISM: HII region: abundances

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ACO S 311 ClG 02 53 38.6880 -66 30 22.310           ~ 8 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17437 0
3 NGC 2122 As* 05 48 55 -70 04.1     10.43     ~ 92 0
4 CCM 71A HII 13 29 39.400 +47 08 41.50           ~ 17 0
5 CCM 84A HII 13 29 43.766 +47 13 07.74           ~ 9 0
6 CCM 72 HII 13 29 44.200 +47 10 23.58           ~ 27 0
7 [CPB2015] NGC5194-4.3+63.3 HII 13 29 52.300 +47 12 46.34           ~ 11 0
8 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4330 4
9 CCM 10 HII 13 29 59.700 +47 13 58.87           ~ 29 0
10 CCM 57 HII 13 30 00.900 +47 09 29.86           ~ 10 0
11 CCM 55 HII 13 30 02.300 +47 09 49.18           ~ 16 0
12 CCM 53 HII 13 30 02.900 +47 09 57.48           ~ 15 0
13 CCM 54 HII 13 30 03.500 +47 09 41.59           ~ 12 0
14 CCM 57A HII 13 30 04.335 +47 12 56.49           ~ 8 0
15 M 20 OpC 18 02 42 -22 58.3           ~ 434 1
16 M 16 OpC 18 18 45.1 -13 47 31           ~ 1029 1

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