Bibcode
Delgado, G.; Viironen, K.; Corradi, R. L. M.; Mampaso, A.
Bibliographical reference
II International GTC Workshop: Science with GTC 1st-light Instruments and the LMT (Eds. A. M. Hidalgo-Gámez, J. J. González, J. M. Rodríguez Espinosa, and S. Torres-Peimbert) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 24, pp. 229-230 (2005) (http://www.astroscu.unam.mx/~rmaa/)
Advertised on:
12
2005
Citations
1
Refereed citations
1
Description
We have studied here for the first time the use of the log(H 0/[N 0]),
log (H 0/[S 0]) diagnostic diagram for determining the metallicities and
ionization parameters of the H 0 regions in the Local Group. An
important advantage of using these lines is their proximity in
wavelength, which both simplifies the observations and makes the
de-reddening corrections much safer or even unnecessary. In order to
study the behaviour of extragalactic H 0 regions in this diagram, we
carried out a thorough bibliographical search comprising all H 0 regions
in all those galaxies of the Local Group for which adequate information
about the relative intensities of the four lines is available, and
compared this observational data to theoretical grids based on MAPPINGS
III (Sutherland and Dopita 1993) and CLOUDY 96b5 (Ferland 2002)
photoionization codes. We found out that both the MAPPINGS and the
CLOUDY models fit the observations well and our main result is that the
studied diagram is a powerful tool for estimating metallicities in
extragalactic H 0 regions.