The stellar populations and evolution of H II galaxies. I - High signal-to-noise optical spectroscopy

Details The stellar populations and evolution of H II galaxies. I - High signal-to-noise optical spectroscopy The stellar populations and evolution of H II galaxies. I - High signal-to-noise optical spectroscopy

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..811c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 15, 1986, p. 811-825.

Astronomy and Astrophysics

Astronomy

177

Dwarf Galaxies, Galactic Evolution, Optical Emission Spectroscopy, Stellar Composition, Stellar Evolution, Abundance, Compact Galaxies, Hydrogen, Nitrogen, Oxygen, Signal To Noise Ratios, Wolf-Rayet Stars

Scientific paper

High signal-to-noise spectroscopic data are presented for 32 selected H II galaxies, most of which have not previously been published. All objects are metal-poor, with gaseous oxygen abundances from about 0.05 to 0.5 of the solar neighborhood value. The nitrogen-to-oxygen abundance ratio has a mean value of 0.036, typical of H II and blue compact galaxies, and is uncorrelated with the oxygen abundance, consistent with most of the nitrogen being of primary origin. Relationships amongst emission-line parameters demonstrate the importance of the temperature of the ionizing cluster T(ion), in determining the spectroscopic properties of H II galaxies. T(ion) increases systematically with decreasing oxygen abundance in the youngest objects, indicating that the initial mass function in H II galaxies may be abundance-sensitive. The scatter in emission-line parameters is interpreted as at a given oxygen abundance, as evolution of the ionizing clusters. Several H II galaxies exhibit Wolf-Rayet features indicative of the presence of several 10,000 WN stars. The lowest-abundance objects have narrow He II emission at the few percent of H-beta level. Low abundance H II galaxies may contain less dust.

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