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Spitzer 4.5 micron Luminosity-Metallicity and Mass-Metallicity Relations for Nearby Dwarf Irregular Galaxies
Henry Lee, E. D. Skillman, J. M. Cannon +4
For a sample of 25 dwarf irregular galaxies with distances D < 5 Mpc and measured oxygen abundances, we present results derived from stellar masses and galaxy luminosities from nea…
First Stellar Abundances in NGC 6822 from VLT-UVES and Keck-HIRES Spectroscopy
K. A. Venn, D. J. Lennon, A. Kaufer +6
We have obtained the first high resolution spectra of individual stars in the dwarf irregular galaxy, NGC 6822. The spectra of the two A-type supergiants were obtained at the VLT a…
Carbon in Spiral Galaxies from Hubble Space Telescope Spectroscopy
D. R. Garnett, G. A. Shields, M. Peimbert +5
We present measurements of the gas-phase C/O abundance ratio in six H II regions in the spiral galaxies M101 and NGC 2403, based on ultraviolet spectroscopy using the Faint Object…