Abundance scaling in stars, nebulae and galaxies

Date

2017

Authors

Nicholls, David
Sutherland, Ralph
Dopita, Michael
Kewley, Lisa
Groves, Brent Allan

Journal Title

Journal ISSN

Volume Title

Publisher

Blackwell Publishing Ltd

Abstract

We present a new basis for scaling abundances with totalmetallicity in nebular photoionizationmodels, based on extensive Milky Way stellar abundance data, to replace the uniform scalingnormally used in the analysis of HII regions. Our goal is to provide a single scalingmethod andlocal abundance reference standard for use in nebular modelling and its key inputs, the stellaratmosphere and evolutionary track models. We introduce a parametric enrichment factor, ζ, to describe how atomic abundances scale with total abundance, which allows for a simpleconversion between scales based on different reference elements (usually oxygen or iron). The models and parametric description provide a more physically realistic approach thansimple uniform abundance scaling. With appropriate parameters, the methods described heremay be applied toHII regions in theMilkyWay, large and dwarf galaxies in the local Universe, active galactic nuclei, and to star-forming regions at high redshift.

Description

Keywords

Sun: abundances, stars: abundances, ISM: abundances, galaxies: abundances.

Citation

Source

Monthly Notices of the Royal Astronomical Society

Type

Journal article

Book Title

Entity type

Access Statement

Open Access

License Rights

DOI

10.1093/mnras/stw3235

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