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33 papers · 2 filters
Thick-disk evolution induced by the growth of an embedded thin disk
Álvaro Villalobos, Stelios Kazantzidis, Amina Helmi
We perform collisionless N-body simulations to investigate the evolution of the structural and kinematical properties of simulated thick disks induced by the growth of an embedded…
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…
Microscopic simulation of methanol and formaldehyde ice formation in cold dense cores
H. M. Cuppen, E. F. van Dishoeck, E. Herbst +1
Methanol and its precursor formaldehyde are among the most studied organic molecules in the interstellar medium and are abundant in the gaseous and solid phases. We recently develo…
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…
Metallicity Mapping with gri Photometry: The Virgo Overdensity and the Halos of the Galaxy
Timothy C. Beers, Deokkeun An, Jennifer A. Johnson +7
We describe the methodology required for estimation of photometric estimates of metallicity based on the SDSS gri passbands, which can be used to probe the properties of main-seque…
The Effect of Differential Limb Magnification on Abundance Analysis of Microlensed Dwarf Stars
Jennifer A. Johnson, Subo Dong, Andrew Gould
Finite source effects can be important in observations of gravitational microlensing of stars. Near caustic crossings, for example, some parts of the source star will be more highl…