Published in MNRAS 312, 130, 2000

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AN EMPIRICAL CALIBRATION OF NEBULAR ABUNDANCES BASED ON THE SULPHUR EMISSION LINES

Angeles I. Díaz and Enrique Pérez-Montero

Dpto. de Física Teórica, C-XI, Universidad Autónoma de Madrid, Cantoblanco, 28049-Madrid, Spain


Abstract. We present an empirical calibration of nebular abundances based on the strong emission lines of [SII] and [SIII] in the red part of the spectrum through the definition of a sulphur abundance parameter S23. 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 rather independent of the degree of ionization of the nebula.


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