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First Results On Shear-Selected Clusters From the Deep Lens Survey: Optical Imaging, Spectroscopy, and X-ray Followup
D. Wittman, I. P. Dell'Antonio, J. P. Hughes +4
We present the first sample of galaxy clusters selected on the basis of their weak gravitational lensing shear. The shear induced by a cluster is a function of its mass profile and…
X-Ray Observations of the Most Massive DLS Shear-Selected Galaxy Clusters
John P. Hughes, Ian Dell'Antonio, Joseph Hennawi +7
We report on preliminary results of our X-ray survey of the most massive clusters currently identified from the Deep Lens Survey (DLS). The DLS cluster sample is selected based on…
The Deep Lens Survey
D. Wittman, J. A. Tyson, I. P. Dell'Antonio +19
The Deep Lens Survey (DLS) is a deep BVRz' imaging survey of seven 2x2 degree fields, with all data to be made public. The primary scientific driver is weak gravitational lensing,…
The Smallest Mass Ratio Young Star Spectroscopic Binaries
L. Prato, M. Simon, T. Mazeh +3
Using high resolution near-infrared spectroscopy with the Keck telescope, we have detected the radial velocity signatures of the cool secondary components in four optically identif…
IR Detection of Low-Mass Secondaries in Spectroscopic Binaries
T. Mazeh, L. Prato, M. Simon +3
This paper outlines an infrared spectroscopic technique to measure the radial velocities of faint secondaries in known single-lined binaries. The paper presents our H-band observat…
AB Dor in '94: I. HST/GHRS Observations of the Quiescent Chromosphere of an Active Star
J. C. Brandt, S. R. Heap, F. M. Walter +15
We analyze HST/GHRS spectra of AB Doradus, the prototypical ultra-rapidly rotating K dwarf. We observed chromospheric (Mg II) and transition region (C II, Si IV, C IV, and N V) lin…