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12 papers · 1 filter
Physical Properties of (2) Pallas
Benoit Carry, Christophe Dumas, Mikko Kaasalainen +8
We acquired and analyzed adaptive-optics imaging observations of asteroid (2) Pallas from Keck II and the Very Large Telescope taken during four Pallas oppositions between 2003 and…
Ruling out Stellar Companions and Resolving the Innermost Regions of Transitional Disks with the Keck Interferometer
Jorg-Uwe Pott, Marshall D. Perrin, Elise Furlan +3
With the Keck Interferometer, we have studied at 2 um the innermost regions of several nearby, young, dust depleted "transitional" disks. Our observations target five of the six cl…
Studies of the Diffuse Interstellar Bands. III. HD 183143
L. M. Hobbs, D. G. York, J. A. Thorburn +8
Echelle spectra of HD 183143 [B7Iae, E(B-V) = 1.27] were obtained on three nights, at a resolving power R = 38,000 and with a signal-to-noise ratio ~1000 at 6400 A in the final, co…
Deep Keck u-band imaging of the Hubble Ultra Deep Field: A catalog of z~3 Lyman Break Galaxies
Marc Rafelski, Arthur M. Wolfe, Jeff Cooke +3
We present a sample of 407 z~3 Lyman break galaxies (LBGs) to a limiting isophotal u-band magnitude of 27.6 mag in the Hubble Ultra Deep Field (UDF). The LBGs are selected using a…
The peculiar solar composition and its possible relation to planet formation
Jorge Melendez, Martin Asplund, Bengt Gustafsson +1
We have conducted a differential elemental abundance analysis of unprecedented accuracy (0.01 dex) of the Sun relative to 11 solar twins from the Hipparcos catalogue and 10 solar a…
First L-band Interferometric Observations of a Young Stellar Object: Probing the Circumstellar Environment of MWC 419
S. Ragland, R. L. Akeson, T. Armandroff +7
We present spatially-resolved K- and L-band spectra (at spectral resolution R = 230 and R = 60, respectively) of MWC 419, a Herbig Ae/Be star. The data were obtained simultaneously…