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Kinematics of T Tauri stars in Chamaeleon
Brandner, Wolfgang; Covino, Elvira; Frink, Sabine +2 more
We study the kinematics of T Tauri stars (TTS) located in the cores of the Chamaeleon clouds as well as far off these clouds. Our sample comprises 2 early type stars known to be related to Cha i, 6 classical (CTTS) and 6 weak-line T Tauri stars (WTTS) known before the ROSAT mission, and 8 bona-fide pre-main sequence (PMS) stars as well as 23 presu…
Deep radio observations of 3C 324 and 3C 368: evidence for jet-cloud interactions
Carilli, C. L.; Garrington, S. T.; Best, P. N. +2 more
High-resolution, deep radio images are presented for two distant radio galaxies, 3C 324 (z=1.206) and 3C 368 (z=1.132), which are both prime examples of the radio-optical alignment effect seen in powerful radio galaxies with redshifts z>~0.6. Radio observations were made using the Very Large Array in A-array configuration at 5 and 8GHz, and usi…
Anomalous Cosmic Rays
Klecker, B.; Baring, M. G.; Leske, R. A. +22 more
We review the observed properties of anomalous cosmic rays and the present status of our knowledge of the processes by which they originate. We compiled a comprehensive set of ACR energy spectral data from various spacecraft throughout the heliosphere during the passes of Ulysses over the poles of the Sun and present first results of a detailed mo…
Imaging and Spectroscopy of Arcs around the Most Luminous X-Ray Cluster, RX J1347.5-1145
Ferguson, Henry C.; Baum, Stefi A.; Kaiser, Mary Elizabeth +9 more
The cluster RX J1347.5-1145, the most luminous cluster in the X-ray wavelengths, was imaged with the newly installed Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope. Its relatively high redshift (0.451) and luminosity indicate that this is one of the most massive of all known clusters. The STIS images unambiguously …
First Results from HIPPARCOS
Kovalevsky, J.
After recalling the principle of the Hipparcos mission and of the data reduction, the main statistical features of the final Hipparcos and Tycho catalogues are presented. The results, characterized by accuracies in annual proper motions and parallaxes of the order of one milliarcsecond have been already widely used for astrophysical investigations…
A Candidate Protoplanet in the Taurus Star-forming Region
Padgett, D. L.; Van Buren, D.; Terebey, S. +2 more
Hubble Space Telescope/Near-Infrared Camera and Multiobject Spectrometer images of the class I protostar TMR-1 (IRAS 04361+2547) reveal a faint companion with 10.0"=1400 AU projected separation. The central protostar is itself resolved as a close binary with 0.31"=42 AU separation, surrounded by circumstellar reflection nebulosity. A long narrow f…
Detection of UIR bands in an isolated local interstellar cirrus cloud
Lemke, D.; Laureijs, R. J.; Lehtinen, K. +4 more
The unidentified infrared (UIR) emission bands at 7.7 and 11.3 mu m have been detected in the emission of an isolated cirrus cloud externally heated by the typical interstellar radiation field (ISRF) of the solar neighbourhood. For the observations we used ISOPHOT, the photometer aboard ISO. The detected UIR bands have absolute intensities ~ 1/100…
Deep Hubble Space Telescope/Planetary Camera Imaging of a Young Compact Radio Galaxy at Z = 2.390
Keel, William C.; Windhorst, Rogier A.; Pascarelle, Sam M.
We present deep 63-orbit Hubble Space Telescope/Planetary Camera images at ~0.06" FWHM resolution in the filters B450, V606, and I814--as well as in redshifted Lyα--of the radio source 53W002, a compact narrow-line galaxy at z=2.390 from the Leiden-Berkeley Deep Survey. These images allow us to distinguish several …
Network Coronal Bright Points: Coronal Heating Concentrations Found in the Solar Magnetic Network
Falconer, D. A.; Moore, R. L.; Porter, J. G. +1 more
We examine the magnetic origins of coronal heating in quiet regions by combining SOHO/EIT Fe XII coronal images and Kitt Peak magnetograms. Spatial filtering of the coronal images shows a network of enhanced structures on the scale of the magnetic network in quiet regions. Superposition of the filtered coronal images on maps of the magnetic networ…
MACHOs, White Dwarfs, and the Age of the Universe
Laughlin, Gregory; Freese, Katherine; Graff, David S.
A favored interpretation of recent microlensing measurements toward the Large Magellanic Cloud implies that a large fraction (i.e., 10%-50%) of the mass of the Galactic dark halo is composed of white dwarfs. However, a ground-based search by Liebert and a recent search of the Hubble Deep Field by Flynn did not detect a substantial dark halo popula…