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7 papers · 2 filters
New Observations of Extra-Disk Molecular Gas in Interacting Galaxy Systems, Including a Two-Component System in Stephan's Quintet
B. J. Smith, C. Struck
We present new CO (1 - 0) observations of eleven extragalactic tails and bridges in nine interacting galaxy systems, almost doubling the number of such features with sensitive CO m…
PG 2131+066: A Test of Pre-White Dwarf Asteroseismology
M. Reed, Steven D. Kawaler, M. Sean O'Brien
PG 2131+066 is a composite-spectrum binary with a hot pulsating PG 1159-type pre-white dwarf and an early M-type main sequence star. Analysis of Whole Earth Telescope observations…
HST Observations of the Interacting Galaxies NGC 2207 and IC 2163
B. G. Elmegreen, M. Kaufman, C. Struck +11
Hubble Space Telescope images of the galaxies NGC 2207 and IC 2163 show star formation and dust structures in a system that has experienced a recent grazing encounter. Tidal forces…
A New Analysis Method for Reconstructing the Arrival Direction of TeV Gamma-rays Using a Single Imaging Atmospheric Cherenkov Telescope
R. W. Lessard, J. H. Buckley, V. Connaughton +1
We present a method of atmospheric Cherenkov imaging which reconstructs the unique arrival direction of TeV gamma rays using a single telescope. The method is derived empirically a…
Evolutionary Timescale of the DAV G117-B15A: The Most Stable Optical Clock Known
S. O. Kepler, Anjum Mukadam, D. E. Winget +5
We observe G117-B15A, the most precise optical clock known, to measure the rate of change of the main pulsation period of this blue-edge DAV white dwarf. Even though the obtained v…
Gamma-ray Observations of the Galactic Plane at Energies E > 500 GeV
S. LeBohec, I. H. Bond, S. M. Bradbury +25
In 1998 and 1999 the Whipple Observatory 10 m telescope was used to search for diffuse gamma ray emission from the Galactic Plane. No signifiant evidence of emission was found. Ass…