138 citations · 313 across the 7 of their papers we have counts for
7 papers
Constraints on Helium Enhancement in the Globular Cluster M3 (NGC 5272): The Horizontal Branch Test
M. Catelan, F. Grundahl, A. V. Sweigart +2
It has recently been suggested that the presence of multiple populations showing various amounts of helium enhancement is the rule, rather than the exception, among globular star c…
The Dearth of UV-Bright Stars in M32: Implications for Stellar Evolution Theory
Thomas M. Brown, Ed Smith, Henry C. Ferguson +3
Using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, we have obtained deep far-ultraviolet images of the compact elliptical galaxy M32. When combined with…
Observations of the Hot Horizontal-Branch Stars in the Metal-Rich Bulge Globular Cluster NGC 6388 - Indications of Helium Enrichment and a Lesson in Crowded Field Spectroscopy
S. Moehler, A. V. Sweigart
(abridged) The metal-rich bulge globular cluster NGC6388 shows a distinct blue horizontal-branch tail with a strong upward tilt in its colour-magnitude diagram. Several noncanonica…
Age Constraints for an M31 Globular Cluster from Main Sequence Photometry
Thomas M. Brown, Henry C. Ferguson, Ed Smith +5
We present a color-magnitude diagram (CMD) of the globular cluster SKHB-312 in the Andromeda galaxy (M31), obtained with the Advanced Camera for Surveys on the Hubble Space Telesco…
Horizontal Branch Models as a Test of Mixing on the RGB
Allen V. Sweigart
We discuss the impact of mixing and rotation along the red-giant branch (RGB) on the properties of horizontal-branch (HB) stars with emphasis on two problems: the nature of the une…
Detection and Photometry of Hot Horizontal Branch Stars in the Core of M32
Thomas M. Brown, Charles W. Bowers, Randy A. Kimble +2
We present the deepest near-UV image of M32 to date, which for the first time resolves hot HB stars in an elliptical galaxy. Given the near-solar metallicity of M32, much larger th…