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Photospheric Silicon in the DA White Dwarf Wolf 1346
Barstow, M. A.; Bruhweiler, F. C.; Holberg, J. B. +1 more
We present a new coadded lUE echelle spectrum of the moderate temperature (Teff ∼20,000 K) DA white dwarf Wolf 1346. In addition to previously reported stellar and interstellar features, we find a number of new stellar lines due to Si II and Si III. These silicon features have observed Doppler velocities near the +23 km s-1 s…
Modeling of Jovian hectometric radiation source locations: Ulysses observations
Menietti, J. D.; Reiner, M. J.
The Unified Radio and Plasma Wave (URAP) experiment on Ulysses has provided unique high latitude measurements of Jovian hectometric radiation (HOM) during its encounter with Jupiter in February 1992. URAP was the first radio instrument in the Jovian environment with radio direction-finding capability, which was previously used to determine the HOM…
A wind in the intermediate polar candidate 1 H0551-819?
Bonnet-Bidaud, J. M.; Buckley, D. A. H.; Mouchet, M. +3 more
IUE observations of the cataclysmic variable 1 H0551-819 obtained at three different epochs reveal P-Cygni type profiles in the CIV line. The shape of these profiles is modulated with the orbital period of the system. The observations suggest the presence of a wind in the system. We considered several models of wind, disc and continuum emitting ho…
Latitudinal variation of the heliospheric magnetic field during solar minimum
Bravo, S.; Stewart, G. A.
Ulysses' observations of the heliospheric magnetic field have shown that, above a narrow low-latitude region, the intensity of the radial component of the field is independent of latitude. Here we present a theoretical explanation of this behaviour based on an MHD model of the solar wind applicable at solar minimum, which corresponds to the Ulysse…
The Temperature of the Supergiant gamma Per
Evans, Nancy Remage; Teays, Terry J.; Lester, John B. +2 more
Because the bright supergiant α Per is located in cluster, and because its angular diameter has been measured, its log g is known observationally, as is its atmospheric microturbulence. Using these observed parameters, we compare its energy distribution derived from lUE spectra and B, V, R, I, J, and K with model atmospheres convolved with instrum…
A Summary of Solar Wind Observations at High Latitudes: ULYSSES
Marsden, R. G.
The Ulysses mission has provided the first in-situ observations of the solar wind covering all solar latitudes from the equator to the poles in both hemispheres. The measurements from the first polar passes, made at near-minimum solar activity conditions, have confirmed the basic picture established on the basis of remote sensing techniques: the h…
Spectroscopic binary orbits from ultraviolet radial velocities. Paper 22: HD 48099
Stickland, D. J.
Temperature Distributions of Accretion Disks in Active Galactic Nuclei
Zhou, You-Yuan; Wang, Jian-Min
We present a simple analytical method to determine the temperature distribution of optically thick accretion disks on the basis of the spectral shape of the big blue bump in an active galactic nucleus (AGN). The method is general and does not require the disk to be Keplerian, stationary, or even conservative (without mass loss). Eight AGNs observe…
Plaskett's Star (HD 47129): Still More Curious
Bagnuolo, William G., Jr.; Barry, Donald J.
The properties of the components of Plaskett's Star (HD 47129) have been the subject of a continuing controversy for over seven decades. In a recent paper, Bagnuolo, Gies, & Wiggs analyzed a set of 17 UV spectra of this object from IUE archives. A tomography algorithm was used to produce the individual spectra of the two components. The physic…
Solar wind-driven flows in the Jovian magnetosphere
Simnett, G. M.; Desai, M. I.
Ion anisotropies in the sub-MeV/nucleon energy region have been measured during the inbound pass of Ulysses through the Jovian magnetosphere. Azimuthal flows in the direction opposite to corotation were detected at several different times, each lasting approximately hours, in the boundary layer and the outer magnetosphere. Similar flows were also …