332 citations · 1.4k across the 15 of their papers we have counts for
7 papers · 2 filters
The Effects of Age on Red Giant Metallicities Derived from the Near-Infrared Ca II Triplet
A. A. Cole, T. A. Smecker-Hane, E. Tolstoy +2
We have obtained spectra with resolution 2.5 Angstroms in the region 7500-9500 Angstroms for 116 red giants in 5 Galactic globular clusters and 6 old open clusters (5 with publishe…
Anomalous Evolution of the Dwarf Galaxy HIPASS J1321-31
Barton J. Pritzl, Patricia M. Knezek, John S. Gallagher +6
We present HST/WFPC2 observations of the dwarf galaxy HIPASS J1321-31. This unusual galaxy lies in the direction of the Centaurus A group of galaxies, and has a color-magnitude dia…
Deep Hubble Space Telescope Imaging of IC 1613 II. The Star Formation History
Evan D. Skillman, Eline Tolstoy, Andrew A. Cole +5
We present deep HST WFPC2 imaging of the Local Group dwarf irregular galaxy IC 1613. The photometry is the deepest to date for an isolated dwarf irregular galaxy. The resulting col…
The Chemical Composition of Two Supergiants in the Dwarf Irregular Galaxy WLM
K. A. Venn, E. Tolstoy, A. Kaufer +5
[Abridged] The chemical composition of two stars in WLM has been determined from high quality UVES data obtained at the VLT UT2 (program 65.N-0375). The model atmospheres analysis…
Stellar Abundances in Dwarf Irregular Galaxies
Kim Venn, Eline Tolstoy, Andreas Kaufer +1
Dwarf irregular galaxies appear to have undergone very slow chemical evolution since they have low nebular abundances, but have had ongoing star formation over the past 15 Gyr. The…
Deep HST Imaging of Sextans A. III. The Star Formation History
Andrew E. Dolphin, A. Saha, Evan D. Skillman +6
We present a measurement of the star formation history of Sextans A, based on WFPC2 photometry that is 50% complete to V=27.5 (M_V ~+ 1.9) and I=27.0. The star formation history an…