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HST Photometry for the Halo Stars in the Leo Elliptical NGC 3377
W. E. Harris, G. L. H. Harris, A. C. Layden +1
We have used the ACS camera on HST to obtain (V,I) photometry for 57,000 red-giant stars in the halo of the Leo elliptical NGC 3377. We use this sample of stars to derive the metal…
The Leo Elliptical NGC 3379: A Metal-Poor Halo Emerges
W. E. Harris, G. L. H. Harris, A. C. Layden +1
We have used the ACS camera on HST to obtain (V,I) photometry for 5300 red-giant stars in the halo of the dominant Leo-group member NGC 3379, a galaxy usually regarded as a classic…
Deep HST Photometry of NGC 6388: Age and Horizontal Branch Luminosity
M. Catelan, P. B. Stetson, B. J. Pritzl +5
Using the Hubble Space Telescope, we have obtained the first color-magnitude diagram (CMD) to reach the main-sequence turnoff of the Galactic globular cluster NGC 6388. From a comp…
Completing the Census of (Bright) Variable Stars in Galactic Globular Clusters
M. Catelan, H. A. Smith, B. J. Pritzl +15
We present a long-term project aimed at completing the census of (bright) variable stars in Galactic globular clusters. While our main aim is to obtain a reliable assessment of the…
Deep Photometry of the Globular Cluster M5: Distance Estimates from White Dwarf and Main Sequence Stars
Andrew C. Layden, Ata Sarajedini, Ted von Hippel +1
We present deep VI photometry of stars in the globular cluster M5 (NGC 5904) based on images taken with the Hubble Space Telescope. The resulting color-magnitude diagram reaches be…
HST Snaphot Study of Variable Stars in Globular Clusters: Inner Region of NGC 6441
Barton J. Pritzl, Horace A. Smith, Peter B. Stetson +4
[Abridged] We present the results of a Hubble Space Telescope snapshot program to survey the inner region of the globular cluster NGC 6441 for its variable stars. A total of 57 var…