19.6k citations
- Australian National UniversityAU880 papers
- Centre National de la Recherche ScientifiqueFR194 papers
- European Southern ObservatoryCL191 papers
- Center for Astrophysics Harvard & SmithsonianUS175 papers
- Space Telescope Science InstituteUS168 papers
- The University of SydneyAU159 papers
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6 papers · 2 filters
Boo-1137 - An Extremely Metal-Poor Star in the Ultra-Faint Dwarf Spheroidal Galaxy Boötes I
John E. Norris, David Yong, Gerard Gilmore +1
We present high-resolution, high-S/N spectra of an extremely metal- poor giant star Boo-1137 in the "ultra-faint" dwarf spheroidal galaxy (dSph) Bootes I (absolute magnitude Mv ~ -…
Stellar Over-densities in the Outer Halo of the Milky Way
Stefan C. Keller
This study presents a tomographic survey of a subset of the outer halo (10-40 kpc) drawn from the Sloan Digital Sky Survey Data Release 6. Halo substructure on spatial scales of $>…
M22: A [Fe/H] Abundance Range Revealed
G. S. Da Costa, E. V. Held, I. Saviane +1
Intermediate resolution spectra at the Ca II triplet have been obtained for 55 candidate red giants in the field of the globular cluster M22 with the VLT/FORS instrument. Spectra w…
Is the Milky Way ringing? The hunt for high velocity streams
I. Minchev, A. C. Quillen, M. Williams +4
We perform numerical simulations of a stellar galactic disk with initial conditions chosen to represent an unrelaxed population which might have been left following a merger. Stars…
Scl-dE1 GC1: An Extended Globular Cluster in a Low-Luminosity Dwarf Elliptical Galaxy
G. S. Da Costa, E. K. Grebel, H. Jerjen +2
We report the discovery from Hubble Space Telescope ACS images of an extended globular cluster, denoted by Scl-dE1 GC1, in the Sculptor Group dwarf Elliptical galaxy Scl-dE1 (Sc22)…
The Chemical Evolution of Globular Clusters I. Reactive Elements and Non-Metals
Andrea Marcolini, Brad K. Gibson, Amanda I. Karakas +1
We propose a new chemical evolution model aimed at explaining the chemical properties of globular clusters (GC) stars. Our model depends upon the existence of (i) a peculiar pre-en…