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- W1966229487 abstract "Using optical spectra of the nuclei of 250 galaxies chosen from the Automated Plate Measuring Facility (APM) survey of UK Schmidt plates, we derive synthetic B-V and V-R colors, estimates of reddening from Balmer decrements, metallicity via oxygen abundance, and star formation rate from the Hα luminosity. We also present mass-to-light ratios and gas mass fractions from 21 cm H I measurements of 238 APM survey galaxies, 101 of which also have optical spectra. This sample of galaxies spans a large range in surface brightness, from high surface brightness irregular galaxies down to the kind of low surface brightness (LSB) galaxies that are missing from most magnitude-limited catalogs. The generally blue global colors are best explained by a combination of low metallicity and active star formation, primarily because of the tremendous scatter in metallicity versus B-V. Optical spectra show the presence of G and K main-sequence stars in the nuclei of these galaxies, and the stellar mass-to-light ratios and gas mass fractions show the galaxies as a whole to be gas-rich. LSB galaxies are most likely to experience sporadic low levels of star formation over gigayear timescales." @default.
- W1966229487 created "2016-06-24" @default.
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- W1966229487 date "2001-11-01" @default.
- W1966229487 modified "2023-10-14" @default.
- W1966229487 title "High and Low Surface Brightness Galaxies in the Local Universe. V. Optical and H [CSC]i[/CSC] Properties" @default.
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- W1966229487 doi "https://doi.org/10.1086/323538" @default.
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