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Measuring Metallicities with HST/WFC3 photometry
Teresa L. Ross, Jon Holtzman, Barbara J. Anthony-Twarog +4
We quantified and calibrated the metallicity and temperature sensitivities of colors derived from nine Wide Field Camera 3 (WFC3) filters aboard the Hubble Space Telescope using Da…
RR Lyrae in the LMC: Insights Into the Oosterhoff Phenomenon
Charles A Kuehn, Horace A. Smith, Marcio Catelan +8
Although more than eight decades have passed since P. Th. Oosterhoff drew attention to differences in the properties of RR Lyrae variables in globular clusters, the origin and sign…
The RR Lyrae variables and Horizontal Branch of NGC6656 (M22)
Andrea Kunder, Peter B. Stetson, Santi Cassisi +10
The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC6656 (M22), with observations spanning a range of twenty-two years. We…
Variable Stars in Large Magellanic Cloud Globular Clusters III: Reticulum
Charles A. Kuehn, Kyra Dame, Horace A. Smith +8
This is the third in a series of papers studying the variable stars in old globular clusters in the Large Magellanic Cloud. The primary goal of this series is to look at how the ch…
On the He burning phases of the Carina dSph
M. Fabrizio, A. Pietrinferni, G. Bono +10
We performed a detailed comparison between predicted He burning phases and multiband photometry of the Carina dwarf spheroidal galaxy. We found a good agreement with the prediction…
On the density profile of the globular cluster M92
A. Di Cecco, A. Zocchi, A. L. Varri +10
We present new number density and surface brightness profiles for the globular cluster M92 (NGC 6341). These profiles are calculated from optical images collected with the CCD mosa…