Open AccessAn empirical calibration of nebular abundances based on the sulphur emission lines
Author(s) -
Díaz Angeles I.,
PérezMontero Enrique
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03117.x
Subject(s) - physics , emission spectrum , astrophysics , calibration , abundance (ecology) , ionization , spectral line , doubly ionized oxygen , nebula , emission nebula , sulfur , astronomy , ion , stars , chemistry , organic chemistry , quantum mechanics , fishery , biology
We present an empirical calibration of nebular abundances based on the strong emission lines of [S ii ] and [S iii ] in the red part of the spectrum through the definition of a sulphur abundance parameter S 23 . This calibration presents two important advantages against the commonly used one based on the optical oxygen lines: it remains single‐valued up to abundances close to solar and is almost independent of the degree of ionization of the nebula.