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12 papers · 2 filters
Globular Cluster Abundances from High-Resolution, Integrated-Light Spectroscopy. IV. The Large Magellanic Cloud: , Fe-peak, Light, and Heavy Elements
J. E. Colucci, R. A. Bernstein, S. A. Cameron +1
We present detailed chemical abundances in 8 clusters in the Large Magellanic Cloud (LMC). We measure abundances of 22 elements for clusters spanning a range in age of 0.05 to 12 G…
Confirmation of One of the Coldest Known Brown Dwarfs
K. L. Luhman, A. J. Burgasser, I. Labbe +5
Using two epochs of 4.5um images from the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope, we recently identified a common proper motion companion to the white dw…
The Candidate Intermediate-Mass Black Hole in the Globular Cluster M54
J. M. Wrobel, J. E. Greene, L. C. Ho
Ibata et al. reported evidence for density and kinematic cusps in the Galactic globular cluster M54, possibly due to the presence of a 9400 solar-mass black hole. Radiative signatu…
The Metallicity Evolution of Interacting Galaxies
Paul Torrey, Thomas J. Cox, Lisa Kewley +1
Nuclear inflows of metal-poor interstellar gas triggered by galaxy interactions can account for the systematically lower central oxygen abundances observed in local interacting gal…
Grand Design and Flocculent Spirals in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
Debra Meloy Elmegreen, the S4G Team
Spiral arm properties of 46 galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G) were measured at 3.6mu, where extinction is small and the old stars dominate. The…
A differential chemical element analysis of the metal poor Globular Cluster NGC 6397
Andreas Koch, Andrew McWilliam
We present chemical abundances in three red giants and two turn-off stars in the metal poor Galactic globular cluster (GC) NGC 6397 based on spectroscopy obtained with the MIKE hig…