564 citations · 1.4k across the 18 of their papers we have counts for
6 papers · 2 filters
Short-Period Variable Stars in the M31 Halo
A. E. Dolphin, A. Saha, E. W. Olszewski +4
We report the findings of a new search for RR Lyraes in an M31 halo field located 40 arcminutes from the nucleus of the galaxy along the minor axis. We detected 37 variable stars,…
Serendipity and the SDSS: Discovery of the Largest Known Planetary Nebula on the Sky
Paul C Hewett, Michael J Irwin, Evan D Skillman +4
Investigation of spectra from the Sloan Digital Sky Survey reveals the presence of a region of ionized gas of >2 degrees diameter centered approximately at alpha = 10^h 37^m delta…
The Recent Evolution of the Dwarf Starburst Galaxy NGC 625 from Hubble Space Telescope Imaging
John M. Cannon, Robbie C. Dohm-Palmer, Evan D. Skillman +3
New HST/WFPC2 imaging of the dwarf starburst galaxy NGC 625 is presented. These data, 80% complete to V and I magnitudes of 26.0 and 25.3, respectively, allow us to study the recen…
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…
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…