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NOTE: Saturn Ring-Plane Crossing, May 1995: Pole Precession and Ring Thickness
Bosh, Amanda S.; Rivkin, Andrew S.; Percival, Jeffrey W. +2 more
On 22 May 1995, as the Earth crossed through Saturn's ring-plane, we used the Wide Field Planetary Camera 2 on the Hubble Space Telescope to image Saturn and its rings for 10 hr centered near the predicted time of ring-plane crossing. By performing photometry on the rings, we find that the time of ring-plane crossing is later than the nominal pred…
Infrared Space Observatory Mapping of 60 Micron Dust Emission around Vega-Type Systems
Stencel, R. E.; Backman, D. E.; Fajardo-Acosta, S. B.
We mapped 60 µm emission around five Vega-type systems. We utilized the PHOT-C100 far-infrared array camera on board the Infrared Space Observatory. The spatial resolution of the maps is ~30". The maps of three sources (α CrB, σ Her, and α Cen) do not show any evidence of extended emission. The map of γ Oph shows marginal hints of extended e…
A spectral analysis of HDE 269445 from optical and infrared observations.
Schmutz, W.; Nota, A.; Origlia, L. +1 more
We present new, near-IR spectroscopic observations of HDE 269445, which we combine with published HST and IUE ultraviolet data and optical high resolution spectra. We discuss the spectral morphology of the star from UV to near-IR wavelengths, concentrating on profile variations in the UV and optical H and He lines. From a spectroscopic analysis wi…
The changes in the UV emission lines of RR Telescopii from 1978 to 1993. I. The IUE SWP region
Hack, M.; Selvelli, P.; Zuccolo, R.
Line emission intensities and FWHMs in the range 1175-1900 Angstroms have been measured on high resolution IUE spectra of RR Tel taken from 1978 to 1993. The variations observed in the emission line intensities show a rather strong correlation with the line ionization. The decrease is of a factor larger than three and up to ten for the low-ionizat…
Hubble Space Telescope Observations of Nebular Morphologies and Their Implications
Livio, Mario
Ulysses observations of a discrete wavepacket upstream of an interplanetary shock
Balogh, A.; Lucek, E. A.
We present a single example of a previously unidentified type of upstream wave structure, found several minutes ahead of a forward propagating, oblique interplanetary shock observed on day 6, 1992, using Ulysses magnetometer data. The wave appears as an isolated high frequency wavepacket associated with a larger scale compressive structure. In the…
Comet Hale-Bopp, Circumstellar Dust, and the Interstellar Medium
Waters, L. B. F. M.; Waelkens, C.; Malfait, K.
The infrared spectrum of comet Hale-Bopp, as observed with the Infrared Space Observatory (ISO), presents astonishing similarities with those of the dusty disks surrounding young stars. The prominent spectral features of crystalline silicates that occur in comets, have been observed in the circumstellar media of young and old stars, yet not in the…
A new look at the nature of comet Halley's LF electromagnetic waves: Giotto observations
Neubauer, Fritz M.; Tsurutani, Bruce T.; Glassmeier, Karl-Heinz +1 more
All of the comet Halley high-time resolution magnetic field data have been examined to determine the nature of the “turbulence” and its difference from that of comets Giacobini-Zinner and Grigg-Skjellerup. Although much of the wave appears unpolarized, occasionally there are intervals of clear order. We find several interesting new wave polarizati…
Solar wind velocity jumps across tangential discontinuities: ULYSSES observations and kinetic interpretation
Tsurutani, B. T.; Roth, M.; de Keyser, J. +2 more
Some tangential discontinuities (TDs) observed by the Ulysses spacecraft interface solar wind regions that differ only in their bulk velocity and magnetic field orientation; composition, density, temperature and magnetic field intensity are essentially the same in both regions. The relation between the plasma velocity jump across the TD and the ma…
Spectroscopic binary orbits from ultraviolet radial velocities. Paper 25: HD 152218
Stickland, D. J.; Lloyd, C.; Penny, L. R.