Vilchez, J. M.
Bibliographical reference
(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Phenomena in Galaxies, Puerto de la Cruz, Spain, July 4-15, 1988) Astrophysics and Space Science (ISSN 0004-640X), vol. 157, no. 1-2, July 1989, p. 9-14.
Advertised on:
7
1989
Citations
9
Refereed citations
8
Description
A new ionization correction factor (ICF) scheme for He(+) is developed,
based on the definition of the radiation softness parameter eta (Vilchez
and Pagel, 1988) which is very sensitive to the effective temperature of
the ionizing star(s) and, therefore, a good indicator of the He(+)-He(0)
ionization structure while remaining insensitive to other nebular
parameters. The ICF(eta) relationship is obtained making use of the
Stasinska (1980, 1982) photoionization models. After comparison with
previous semiempirical approaches in the literature and its application
to a selected sample of abundances, it is found that this ICF scheme
seems a powerful tool for the determination of He abundances,
particularly for objects of intermediate to low excitation.