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Resolved Near-Infrared Stellar Populations in Nearby Galaxies
Julianne J. Dalcanton, Benjamin F. Williams, Jason L. Melbourne +10
We present near-infrared (NIR) color-magnitude diagrams (CMDs) for the resolved stellar populations within 26 fields of 23 nearby galaxies (<4 Mpc), based on F110W and F160W images…
Modeling the Effects of Star Formation Histories on Halpha and Ultra-Violet Fluxes in Nearby Dwarf Galaxies
Daniel R. Weisz, Benjamin D. Johnson, L. Clifton Johnson +9
We consider the effects of non-constant star formation histories (SFHs) on Halpha and GALEX far ultra-violet (FUV) star formation rate (SFR) indicators. Under the assumption of a f…
Observational Constraints on Red and Blue Helium Burning Sequences
Kristen B. W. McQuinn, Evan D. Skillman, Julianne J. Dalcanton +4
We derive the optical luminosity, colors, and ratios of the blue and red helium burning (HeB) stellar populations from archival Hubble Space Telescope observations of nineteen star…
The Progenitor Mass of SN 2011dh from Stellar Populations Analysis
Jeremiah W. Murphy, Zachary G. Jennings, Benjamin Williams +2
Using Hubble Space Telescope (HST) photometry, we characterize the age of the stellar association in the vicinity of supernova (SN) 2011dh and use it to infer the zero-age main seq…
The History of Star Formation in Galaxy Disks in the Local Volume as Measured by the ACS Nearby Galaxy Survey Treasury
Benjamin F. Williams, Julianne J. Dalcanton, L. C. Johnson +9
We present a measurement of the age distribution of stars residing in spiral disks and dwarf galaxies. We derive a complete star formation history of the ~140 Mpc^3 covered by the…
Chandra Detection of SN 2010da Four Months After Outburst: Evidence for a Supergiant X-ray Binary in NGC 300
B. Binder, B. F. Williams, A. K. H. Kong +4
We present the results of a 63 ks {\it Chandra} observation of the "supernova impostor" SN 2010da four months after it was first observed on 25 May 2010. We detect an X-ray source…