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Deep HST Imaging of Sextans A. II. Cepheids and Distance
Andrew E. Dolphin, A. Saha, Evan D. Skillman +6
We have identified 82 short-period variable stars in Sextans A from deep WFPC2 observations. All of the periodic variables appear to be short-period Cepheids, with periods as small…
Star Formation in Sculptor Group Dwarf Irregular Galaxies and the Nature of "Transition" Galaxies
Evan D. Skillman, Stephanie Cote, Bryan W. Miller
We present new H-alpha narrow band imaging of the HII regions in eight Sculptor Group dwarf irregular (dI) galaxies. Comparing the Sculptor Group dIs to the Local Group dIs, we fin…
ISM Abundances in Sculptor Group Dwarf Irregular Galaxies
Evan D. Skillman, Stephanie Cote, Bryan W. Miller
Using the CTIO 4-m telescope, we have obtained optical spectra of HII regions in five Sculptor Group dwarf irregular galaxies. We derive oxygen, nitrogen, and sulfur abundances fro…
Dust and molecules in the Local Group galaxy NGC 6822. III. The first-ranked HII region complex Hubble V
F. P. Israel, F. Baas, R. J. Rudy +2
We present maps of the first-ranked HII region complex Hubble V in the metal-poor Local Group dwarf galaxy NGC 6822 in the first four transitions of CO, the 158 micron transition o…