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Dual-frequency radio sounding of the solar corona during the 1995 conjunction of the Ulysses spacecraft
Pätzold, M.; Bird, M. K.; Asmar, S. W. +2 more
The Ulysses Solar Corona Experiment was performed during the spacecraft's superior solar conjunction from 22 February to 14 March 1995, shortly before perihelion and the transit through the ecliptic plane. The high inclination of the Ulysses orbit resulted in an unusual occultation geometry for coronal radio sounding with the spacecraft's dual-fre…
HST observations of 3C305.
Sparks, W. B.; Macchetto, F.; Miley, G. K. +1 more
We present and discuss Hubble Space Telescope observations of the low-redshift radio galaxy 3C305 0.1" resolution images in [OII] and continuum bands are compared with VLA 2cm radio data. We quantify the radio-optical position offset in the northern lobe of the source and use this to constrain models of the interaction of radio jets with the ISM. …
Velocity Profile of the Ionized Disk and the Mass of the Black Hole in M87
Chakrabarti, Sandip K.
We present a theoretical model for the ionized disk in M87 which includes spiral shock waves. The line emission profiles computed from this model at various positions on the disk are found to be in agreement with the recent Hubble Space Telescope results. Based on this model, we find that the ionized disk comprises two-armed giant spiral shock wav…
Spectroscopic binary orbits from ultraviolet radial velocities. Paper 18: TU MUSCAE (HD 100213)
Stickland, D. J.; Lloyd, C.; Pachoulakis, I. +1 more
HST-GHRS observations of α Piscis Austrini. Evidence of no gas content in the circumstellar environment.
Deleuil, M.; Ferlet, R.; Vidal-Madjar, A. +4 more
The origin of the gaseous disk around the star β Pictoris is still unclear. A way to progress is to search for gas signatures in the environment of other stars presenting known IR excesses as initially discovered with the IRAS satellite. Recently, Cheng et al. (1994) reported the possible detection of circumstellar gas absorptions in the spectrum …
Anomalous gallium line profiles in HgMn stars: possible evidence for chemically stratified atmospheres.
Smith, Keith C.
An analysis of co-added high-resolution IUE spectra is presented for three mercury-manganese stars (µ Lep, HR 2844, and HR 7143) which exhibit anomalous Gaiii λ1495 resonance line profiles. This line appears to have unusually weak wings in these stars when compared with synthetic profiles computed under the conventional assumptions of atmosp…
A Search for r-Process Elements in the VELA Supernova Remnant
Jenkins, Edward B.; Wallerstein, George; Vanture, Andrew D. +1 more
After a description of recent developments in the physics of rapid neutron capture in Type II supernovae and a discussion of the detectability of supernovae ejecta, we present the data from a search for Ge, Kr, Yb, Os, and Hg in five stars behind or within the Vela remnant. Only Ge ii was detected, but its column density and the upper limits of th…
Cometary ion pickup processes: Halley and Grigg-Skjellerup compared
Johnstone, A. D.
After Giotto's encounters with two comets of quite different gas production rates we attempt to compare the results to see:- a) to what extent theories which fitted the results at Halley could be applied to the much smaller Grigg-Skjellerup; b) whether the different relationship between the various scale lengths involved created any observable eff…
The IUE Absorption Spectrum of the Nucleus of NGC 246: Mostly C IV and O VI
Feibelman, Walter A.
We present a list of more than 140 absorption features and their equivalent widths for the central star of the planetary nebula NGC 246 as observed in the wavelength range lambda-1169-lambda 2000. High signal-to-noise ratios are achieved by coadding nine high-dispersion SWP spectra, representing a total of nearly 22 hrs observing time. The IUE spe…
Alfvenic Fluctuations in the Solar Wind: A Case Study Using ULYSSES Measurements
Balogh, A.; Forsyth, R. J.; Scime, E. E. +3 more
We present preliminary results of a study of solar wind Alfvénic fluctuations using magnetometer and plasma measurements from the spacecraft Ulysses. We focus on a particular case study, and use ‘wave language’ to discuss the fluctuations. The observations are consistent with a mixture of convected structures and Alfvén wave trains. Furthermore, o…