Ionized gaseous nebulae abundance determination from the direct method

DOI: 
10.1088/1538-3873/aa5abb
Publication date: 
17/04/2017
Main author: 
Pérez-Montero E.
IAA authors: 
Pérez-Montero, E.
Authors: 
Pérez-Montero E.
Journal: 
Publications of the Astronomical Society of the Pacific
Refereed: 
Yes
Publication type: 
Article
Volume: 
129
Pages: 
43001
Number: 
043001
Abstract: 

This tutorial explains the procedure used to analyze an optical emission-line spectrum produced by a nebula ionized by massive star formation. Particularly, the methodology used to derive physical properties, such as electron density and temperature, and the ionic abundances of the most representative elements whose emission lines are present in the optical spectrum is described. The main focus is on the direct method, which is based on the measurement of the electron temperature to derive the abundances, given that the ionization and thermal equilibrium of the ionized gas is dominated by the metallicity. The ionization correction factors used to obtain total abundances from the abundances of some of their ions are also given. Finally, some strong-line methods to derive abundances are described. Such methods are used when no estimation of the temperature can be derived, but which can be consistent with the direct method if they are empirically calibrated. © 2017. The Astronomical Society of the Pacific. All rights reserved.

Database: 
SCOPUS
ADS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85015854211&doi=10.1088%2f1538-3873%2faa5abb&partnerID=40&md5=2209017fad694e5e3d3a849f0a0bba2e
ADS Bibcode: 
2017PASP..129d3001P
Keywords: 
Galaxies: Abundances; Galaxies: Star formation; ISM: Abundances