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15 papers · 2 filters
A Puzzle Involving Galactic Bulge Microlensing Events
Judith G. Cohen, Andrew Gould, Ian B. Thompson +7
We study a sample of 16 microlensed Galactic bulge main sequence turnoff region stars for which high dispersion spectra have been obtained with detailed abundance analyses. We demo…
Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. II. Ages, metallicities, detailed elemental abundances, and connections to the Galactic thick disc
T. Bensby, S. Feltzing, J. A. Johnson +13
The Bulge is the least understood major stellar population of the Milky Way. Most of what we know about the formation and evolution of the Bulge comes from bright giant stars. The…
The origin of very wide binary systems
M. B. N. Kouwenhoven, S. P. Goodwin, Richard J. Parker +3
The majority of stars in the Galactic field and halo are part of binary or multiple systems. A significant fraction of these systems have orbital separations in excess of thousands…
Evidence of enrichment by individual supernova from elemental abundance ratios in the very metal-poor dSph galaxy Bootes I
S. Feltzing, K. Eriksson, J. Kleyna +1
Aim: We establish the mean metallicity from high-resolution spectroscopy for the recently found dwarf spheroidal galaxy Bootes I and test whether it is a common feature for ultra-f…
A new low mass for the Hercules dSph: the end of a common mass scale for the dwarfs?
D. Adén, M. I. Wilkinson, J. I. Read +5
We present a new mass estimate for the Hercules dwarf spheroidal galaxy (dSph), based on the revised velocity dispersion obtained by Aden et al. (2009, arXiv:0908.3489). The remova…
Chemical abundances for 11 bulge stars from high-resolution, near-IR spectra
N. Ryde, B. Gustafsson, B. Edvardsson +10
It is debated whether the Milky Way bulge has the characteristics of a classical bulge sooner than those of a pseudobulge. Detailed abundance studies of bulge stars is a key to inv…