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HD 199143 and HD 358623: Two Recently Identified Members of the Beta Pictoris Moving Group
D. Kaisler, B. Zuckerman, I. Song +5
HD 199143 and HD 358623 (BD-17 6128) are two sets of binary stars which are physically associated and 48 pc from Earth. We present heliocentric radial velocities and high lithium a…
Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way
A. M. Ghez, S. A. Wright, K. Matthews +7
We report the detection of a variable point source, imaged at L'(3.8 microns) with the W. M. Keck II 10-meter telescope's adaptive optics system, that is coincident to within 18 ma…
Stellar Orbits Around the Galactic Center Black Hole
A. M. Ghez, S. Salim, S. D. Hornstein +5
We present new proper motion measurements and simultaneous orbital solutions for three newly identified (S0-16, S0-19, and S0-20) and four previously known (S0-1, S0-2, S0-4, and S…
The Compact Nucleus of the Deep Silicate Absorption Galaxy NGC 4418
A. S. Evans, E. E. Becklin, N. Z. Scoville +6
High resolution, Hubble Space Telescope (HST) near-infrared and Keck mid-infrared images of the heavily extinguished, infrared luminous galaxy NGC 4418 are presented. These data ma…
The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
A. M. Ghez, G. Duchene, K. Matthews +11
We have obtained the first detection of spectral absorption lines in one of the high-velocity stars in the vicinity of the Galaxy's central supermassive black hole. Both Brgamma (2…