SIMBAD references

1999A&A...351.1075R - Astronomy and Astrophysics, volume 351, 1075-1086 (1999/11-3)

The abundances of O, S, Cl, N, Ar, He and C in seven Galactic HII regions.


Abstract (from CDS):

An analysis of CCD spectra in the range λλ4200-8775, obtained at several positions of seven bright Galactic HII regions, with galactocentric distances in the range 6-10kpc, is presented. Temperatures, densities and ionic abundances are calculated for all the positions, and the relative trends followed by these parameters are established. It is shown that all these HII regions share the same abundances of O, S, Cl, N, Ar and He, within their expected uncertainties, a result which is consistent with a flat or small abundance gradient in the Galactic disc within ±2kpc from the Sun, as suggested by some studies of the abundances in HII regions and B-type stars. The same set of homogeneously derived ionic abundances is also used to test the accuracy of the fractional ionization predicted by available grids of models for photoionized nebulae.

Abstract Copyright:

Journal keyword(s): ISM: HII regions - ISM: abundances - Galaxy: abundances

CDS comments: Tables 2, 3: positions in the HII regions, not objects.

Simbad objects: 13

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