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Time-series Spectroscopy and Photometry of the Pulsating Subdwarf B Star PG 1219+534 (KY UMa)
M. D. Reed, J. R. Eggen, S. L. Harms +7
We present observations and analysis of time-series spectroscopy and photometry of the pulsating subdwarf B star PG 1219+534 (KY UMa). Subdwarf B stars are blue horizontal branch s…
Discovery of the Ultra-Bright Type II-L Supernova 2008es
S. Gezari, J. P. Halpern, D. Grupe +12
We report the discovery by the Robotic Optical Transient Experiment (ROTSE-IIIb) telescope of SN 2008es, an overluminous supernova (SN) at z=0.205 with a peak visual magnitude of -…
Abundance Patterns in Stars in the Bulge and Galactic Center
K. Cunha, V. Smith, K. Sellgren +3
We discuss oxygen and iron abundance patterns in K and M red-giant members of the Galactic bulge and in the young and massive M-type stars inhabiting the very center of the Milky W…
Chemical Abundances of Luminous Cool Stars in the Galactic Center from High-Resolution Infrared Spectroscopy
Katia Cunha, Kris Sellgren, Verne V. Smith +3
We present chemical abundances in a sample of luminous cool stars located within 30 pc of the Galactic Center. Abundances of carbon, nitrogen, oxygen, calcium, and iron were derive…
Observational consequences of the hypothesized helium rich stellar population in Omega Centauri
G. Newsham, D. M. Terndrup
In response to the proposed high helium content stars as an explanation for the double main sequence observed in Omega Centauri, we investigated the consequences of such stars else…
Resolving the pulsations of subdwarf B stars: HS 0039+4302, HS 0444+0458, and an examination of the group properties of resolved pulsators
M. D. Reed, D. M. Terndrup, A. -Y. Zhou +3
We continue our program of single-site observations of pulsating subdwarf B (sdB) stars and present the results of extensive time series photometry of HS 0039+4302 and HS 0444+0458…