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Abundance and Isotopic Composition of Platinum in χ Lupi and HR 7775 Derived with the Help of New Laboratory Spectra of Pt II
Johansson, Sveneric; Wahlgren, Glenn M.; Leckrone, David S. +3 more
The platinum isotope anomaly observed in the chemically peculiar HgMn star χ Lupi has been confirmed by analysis with new high-resolution laboratory spectra recorded with the VUV Fourier transform spectrometer at Lund University. The χ Lupi platinum composition is shown to be a mixture of isotopes 196 and 198. Recent observations made with the Hub…
Asteroid Trails in Hubble Space TelescopeWFPC2 Images: First Results
Ballester, Gilda E.; Grillmair, Carl; Crisp, David +21 more
Careful examination of 28,460 selected Wide Field and Planetary Camera 2 (WFPC2) long exposures from 1994, 1995, and early 1996 has revealed trails of 96 distinct moving objects. They have been reported to the International Astronomical Union's (IAU) Minor Planet Center for their asteroid database and a few have been identified with known asteroid…
Extreme Infrared Stars Discovered in Magellanic Cloud Globular Clusters
Glass, I. S.; Sauvage, M.; Onaka, T. +3 more
We report preliminary results of our systematic survey for infrared stars in the globular clusters of the Magellanic Clouds. In the course of an ISOCAM survey for AGB stars in the intermediate-age clusters, we have discovered extremely red AGB stars in NGC 419 and NGC 1978. From their colours and luminosities, they are thought to be experiencing i…
TRIFFID Photometry of Globular Cluster Cores - I. Photometric Techniques and Variable Stars in M15
Morris, P. W.; Shearer, A.; Butler, R. F. +6 more
The Galway/DIAS Image Sharpening Camera, TRIFFID, has been used to make observations in two colours of the centre of the post-core-collapse globular cluster M15. We present here our analysis of the photometry in B over two seasons. We have combined the complementary qualities of the HST's high astrometric precision and TRIFFID's extended coverage …
Search for Interstellar Water in the Translucent Molecular Cloud toward HD 154368
Stauffer, John; Neufeld, David; Melnick, Gary J. +2 more
We report an upper limit of 9 × 1012 cm-2 on the column density of water in the translucent cloud along the line of sight toward HD 154368. This result is based on a search for the C-X band of water near 1240 Å carried out using the Goddard High-Resolution Spectrograph (GHRS) of the Hubble Space Telescope. Our observational l…
WFPC2 Observations of NGC 454: An Interacting Pair of Galaxies
Panagia, N.; Stiavelli, M.; Romaniello, M. +3 more
We present Wide Field Planetary Camera 2 images in the F450W, F606W, and F814W filters of the interacting pair of galaxies NGC 454. Our data indicate that the system is in the early stages of interaction. A population of young star clusters has formed around the late component, and substantial amounts of gas have sunk into the center of the earlie…
A Fit to the Simultaneous Broadband Spectrum of Cygnus X-1 Using the Transition Disk Model
Misra, R.; Melia, Fulvio; Chitnis, V. R.
We have used the transition disk model to fit the simultaneous broadband (2-500 keV) spectrum of Cygnus X-1 from OSSE and Ginga observations. In this model, the spectrum is produced by saturated Comptonization within the inner region of the accretion disk, where the temperature varies rapidly with radius. In an earlier attempt, we demonstrated the…
Kinematics of the narrow-line region of NGC 1068
Dietrich, M.; Wagner, S. J.
We investigated the kinematics of the Narrow Line Region of NGC 1068. In order to study the kinematics and to determine whether the unusual broad line width can be attributed to motion of NLR clouds in a deep gravitational potential or to expanding shocks, we carried out spatially resolved echelle spectroscopy. High spectral resolution enables the…
Dust in LBV Nebulae
Waters, L. B. F. M.; Morris, P. W.; Lamers, H. J. G. L. M. +2 more
Hubble Space Telescope Astrometric Observations and Orbital Mean Motion Corrections for the Inner Uranian Satellites
Pascu, Dan; Rohde, James R.; Seidelmann, P. Kenneth +6 more
The 10 small inner satellites of Uranus were discovered in 1986 with Voyager 2 and not seen again until 1994, when eight were recovered with the Hubble Space Telescope Wide Field Planetary Camera 2 for astrometric, dynamical, and photometric studies. Thirty-three exposures were taken on 1994 August 14 with the PC1 chip in the BVRI filters. Measura…