Spatial inhomogeneities in giant extragalactic H II regions

Details Spatial inhomogeneities in giant extragalactic H II regions Spatial inhomogeneities in giant extragalactic H II regions

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..505m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 505-517. Research supported by SEUI and CSIC.

Astronomy and Astrophysics

Astrophysics

31

H Ii Regions, Intergalactic Media, Star Clusters, Stellar Evolution, Chemical Composition, Inhomogeneity, Spatial Distribution, Stellar Winds

Scientific paper

Giant extragalactic H II regions (GEHR) have been analyzed with emphasis placed on the spatial distribution of relevant parameters. The results indicate that the metallicity Z is constant across the area under consideration of a given GEHR. The same applies to the He/H and Ne/O abundance ratios. All the GEHR are found to have He/H = 0.075 within 30 percent, without any trend with Z. Particular attention is given to the possible causes of the point-to-point spectral variations within a GEHR. It is argued that the spatial distribution of the line ratios should be attributed to fluctuations in the ionization parameter. These variations are not produced by inhomogeneities in the electron density, but are associated with the aging and evolution of the ionizing stellar clusters.

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