Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apjs...58..533h&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 58, Aug. 1985, p. 533-560.
Astronomy and Astrophysics
Astrophysics
146
Brightness Distribution, Dwarf Galaxies, Galactic Structure, Star Distribution, Stellar Evolution, Surface Properties, Charge Coupled Devices, Emission Spectra, H Alpha Line, Oxygen, Star Formation Rate, Stellar Color, Stellar Spectrophotometry, Visible Spectrum
Scientific paper
Spectroscopic and imaging data designed to study star formation processes in a sample of dwarf irregular (Irr) galaxies are presented. Although the low-surface brightness dwarf Irr's have much H I gas with which to form stars, the galaxy-wide star formation rates are low: typically about 10 to the -10th solar mass/yr/sq pc. The properties of the low-surface brightness dwarf Irr's are consistent with a constant star formation rate equal to their current rate over approximately a Hubble time. The typical star-forming regions in the dwarfs are on average smaller and less luminous than those in the giant Irr's, although the size distributions cover the same range, while similar to giant Irr's in many global parameters, the dwarfs have lower current and historical star formation rates per unit area. Dwarf Irr's have low metallicities relative to spirals, with typical nebular oxygen abundances falling between those of the LMC and SMC.
Gallagher John S. III
Hunter Deidre Ann
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