Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..349p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 2, Jan. 1992, p. 349-358.
Astronomy and Astrophysics
Astrophysics
21
Emission Spectra, Galactic Clusters, Galactic Evolution, Irregular Galaxies, H Ii Regions, Interstellar Matter, Line Spectra
Scientific paper
Spectrophotometry in the 3400-7700 A range is presented of ten emission line galaxies in the Bootes void and of five H II galaxies in the direction of the void. Of the ten galaxies in the void, one is a liner, another one is a Seyfert 1, and the other eight are H II galaxies. The emission line properties of H II galaxies are compared with those of giant H II regions in nearby galaxies. The void H II galaxies have larger forbidden S II/H-alpha intensity ratios than those of giant H II regions and half of them show N II/S II forbidden-line ratios smaller than those of giant H II regions. Two of the H II galaxies in the void and one of the H II galaxies in the direction of the void have N/O values that are small for their O/H values. The N/O anomaly probably implies that the average age of the stellar population in these three galaxies is smaller than that of irregular and spiral galaxies close to the Galaxy.
Peimbert Manuel
Torres-Peimbert Silvia
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