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Resolved Structure in the Nuclear Region of the Ultraluminous Infrared Galaxy Markarian 273
Knapen, J. H.; Laine, S.; Doyon, R. +4 more
We have studied the core morphology of the ultraluminous infrared galaxy Mrk 273 by combining a high-resolution adaptive optics near-infrared image with an optical image from the Hubble Space Telescope and interferometric radio continuum data, all at spatial resolutions of 150 mas or better. The near-infrared image reveals that the nucleus has two…
A comparative study of cosmic ray radial and latitudinal gradients in the inner and outer heliosphere
Kunow, H.; Wibberenz, G.; Heber, B. +6 more
The radial and latitudinal intensity gradients of 145-255 MeV/nucleon He, 34-50 MeV/nucleon He and 30-69 MeV H are studied over an extensive range of heliocentric distances and latitudes for the 1993.0-1996.0 time period using data from cosmic ray experiments on the Ulysses, IMP 8, Voyager 1 and 2, and Pioneer 10 spacecraft. The radial gradients a…
Observations of the Hubble Deep Field with the Infrared Space Observatory - IV. Association of sources with Hubble Deep Field galaxies
Elbaz, D.; Danese, L.; Franceschini, A. +17 more
We discuss the identification of sources detected by the Infrared Space Observatory (ISO) at 6.7 and 15 µ in the Hubble Deep Field (HDF) region. We conservatively associate ISO sources with objects in existing optical and near-infrared HDF catalogues using the likelihood ratio method, confirming these results (and, in one case, clarifying th…
Ultraviolet Coronagraph Spectrometer Observation of the 1996 December 23 Coronal Mass Ejection
Romoli, M.; Raymond, J. C.; Ciaravella, A. +9 more
The Ultraviolet Coronagraph Spectrometer (UVCS) aboard the Solar and Heliospheric Observatory (SOHO) observed a spectacular coronal mass ejection (CME) caused by a prominence eruption on 1996 December 23. The evolution of the ejected prominence material was followed for 1 hr and 50 minutes. The observation consists of a series of 5 minute exposure…
Deep HST/FOC Imaging of the Central Density Cusp of the Globular Cluster M15
King, Ivan R.; Sosin, Craig
Using the Faint Object Camera on the repaired Hubble Space Telescope, we have observed two fields in the globular cluster M15:\ the central density cusp, and a field at r = 20''. These are the highest-resolution images ever taken of this cluster's dense core, and are the first to probe the distribution of stars well below the main-sequence turnoff…
A search for hidden white dwarfs in the ROSAT extreme ultraviolet survey
Barstow, M. A.; Burleigh, M. R.; Fleming, T. A.
The ROSAT Wide Field Camera survey has provided us with evidence for the existence of a previously unidentified sample of hot white dwarfs (WDs) in non- interacting binary systems, through the detection of extreme ultraviolet (EUV) and soft X-ray emission. These stars are hidden at optical wavelengths because of their close proximity to much more …
A theoretical approach to globular cluster low main sequence stars.
Cassisi, S.; Castellani, V.; degl'Innocenti, S. +3 more
This paper present new evolutionary computations extending toward the lower main sequence previous computations given for globular cluster stars. We discuss the physical inputs with particular regard to the limit of the adopted usual treatment of the stellar atmosphere, which allows a tight correlation with actual stellar structures only for selec…
ULYSSES observations of intermittent heliospheric turbulence
Balogh, A.; Horbury, T. S.; Forsyth, R. J. +1 more
Structure function measurements of small scale magnetic field fluctuations in high speed streams emanating from the Sun's polar coronal holes are well described by a multifractal model of intermittent turbulence. We discuss structure functions and present measurements of intermittency through the transition regime - encompassing scales between wav…
[Fe IV] in the Orion Nebula
Martin, P. G.; O'Dell, C. R.; Dufour, R. J. +6 more
Using the Goddard High-Resolution Spectrograph on the Hubble Space Telescope, we measured the flux of [Fe IV] (3d5 4P5/2 --> 3d5 6S5/2) λvac = 2836.56 Å in the Orion Nebula, the first detection of an [Fe IV] line in an H II region. A useful upper limit is set on the su…
Mesures de vitesses radiales. VIII. Accompagnement AU sol du programme d'observation du satellite HIPPARCOS
Duflot, M.; Burnage, R.; Genty, V. +2 more
We publish 1879 radial velocities of stars distributed in 105 fields of 4^{\circ} \times 4^{\circ}. We continue the PPO series \cite[(Fehrenbach et al. 1987;]{Feh87} \cite[Duflot et al. 1990, 1992 and 1995),]{Du90} using the Fehrenbach objective prism method. Table 1 only available in electronic form at CDS via to cdsarc.u-strasbg.fr (130.79.128.5…