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Discovery of a Weak CN Spectral Absorption Feature in Red Supergiant Stars in the Andromeda (M31) and Triangulum (M33) Galaxies
Puragra Guhathakurta, Douglas Grion Filho, Antara R. Bhattacharya +14
Using Keck DEIMOS spectra of stars in the Andromeda (M31) and Triangulum (M33) galaxies, selected from the large multi-band (near ultraviolet, visible light, and near infrared) Hub…
A Low Metallicity Massive Contact Binary Star System Candidate in WLM identified by Hubble and James Webb Space Telescope imaging
Maude Gull, Daniel R. Weisz, Kareem El-Badry +15
We present archival HST and JWST ultraviolet through near infrared time series photometric observations of a massive minimal-contact binary candidate in the metal-poor galaxy WLM (…
A Panchromatic Study of Massive Stars in the Extremely Metal-Poor Local Group Dwarf Galaxy Leo A
Maude Gull, Daniel R. Weisz, Peter Senchyna +17
We characterize massive stars (M>8 M_sun) in the nearby (D~0.8 Mpc) extremely metal-poor (Z~5% Z_sun) galaxy Leo A using Hubble Space Telescope ultra-violet (UV), optical, and near…
Constraints for the Progenitor Masses of 17 Historic Core-Collapse Supernovae
Benjamin F. Williams, Skyler Peterson, Jeremiah Murphy +4
Using resolved stellar photometry measured from archival HST imaging, we generate color-magnitude diagrams of the stars within 50 pc of the locations of historic core-collapse supe…
The ACS Nearby Galaxy Survey Treasury IX. Constraining asymptotic giant branch evolution with old metal-poor galaxies
Leo Girardi, Benjamin F. Williams, Karoline M. Gilbert +10
In an attempt to constrain evolutionary models of the asymptotic giant branch (AGB) phase at the limit of low masses and low metallicities, we have examined the luminosity function…
SN2010U -- a Luminous Nova in NGC 4214
Roberta M. Humphreys, Jose L. Prieto, Philip Rosenfield +12
The luminosity, light curve, post--maximum spectrum, and lack of a progenitor on deep pre-outburst images suggest that SN 2010U was a luminous, fast nova. Its outburst magnitude is…
The NGC 300 Transient: An Alternative Method For Measuring Progenitor Masses
Stephanie M. Gogarten, Julianne J. Dalcanton, Jeremiah W. Murphy +3
We present an alternative technique for measuring the precursor masses of transient events in stars undergoing late stage stellar evolution. We use the well-established techniques…