SIMBAD references

2010ApJ...720.1738P - Astrophys. J., 720, 1738-1751 (2010/September-2)

New improved calibration relations for the determination of electron temperatures and oxygen and nitrogen abundances in H II regions.

PILYUGIN L.S., VILCHEZ J.M. and THUAN T.X.

Abstract (from CDS):

New improved empirical calibrations for the determination of electron temperatures and oxygen and nitrogen abundances in H II regions from the strong emission lines of oxygen, nitrogen, and sulfur are given. They are derived using spectra of H II regions with measured electron temperatures as calibrating data. Calibration relations are given separately for three classes of H II regions: cool, warm, and hot ones. Criteria for assigning a H II region to one of these classes are suggested. We find that classification ambiguities arise only in the case of hot H II regions with enhanced nitrogen abundances. The derived calibrations provide reliable abundances for H II regions: the mean difference between oxygen abundances determined from the calibrations and Te-based oxygen abundances is ∼0.075 dex, while it is ∼0.05 dex for nitrogen abundances.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: evolution - galaxies: ISM - H II regions

Simbad objects: 11

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2020.10.24-14:02:54

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