A new ionization correction scheme for He(+)/H(+) and the determination of the helium abundance in H II regions

Details A new ionization correction scheme for He(+)/H(+) and the determination of the helium abundance in H II regions A new ionization correction scheme for He(+)/H(+) and the determination of the helium abundance in H II regions

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157....9v&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Statistics

Computation

6

Abundance, Gas Ionization, H Ii Regions, Helium Ions, Hydrogen Ions, Computational Astrophysics, Stellar Radiation

Scientific paper

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.

Affiliated with

Also associated with

No associations

Rating

A new ionization correction scheme for He(+)/H(+) and the determination of the helium abundance in H II regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A new ionization correction scheme for He(+)/H(+) and the determination of the helium abundance in H II regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new ionization correction scheme for He(+)/H(+) and the determination of the helium abundance in H II regions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1703499