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Cospin let observations of recurrent energetic particle events during the in-ecliptic phase of the Ulysses mission
Bame, S. J.; Sanderson, T. R.; Marsden, R. G. +1 more
The Ulysses spacecraft, launched in October 1990, traversed the in-ecliptic region of the heliosphere from 1 to 5 AU during the post-maximum phase of solar cycle 22 prior to its encounter with Jupiter in February 1992. In the period from launch up to mid-1991, particle events were dominated by the effects of large-scale transient structures in the…
A multi-frequency study of symbiotic stars - III. Simultaneous ultraviolet and optical observations of AX Persei.
Ivison, R. J.; Evans, A.; Bode, M. F. +2 more
The results of UV and optical monitoring of the classical symbiotic star AX Per are reported. The recent visual postoutburst light curve is used to estimate the size of the binary components in the AX Per system and to speculate on the cause of unusual ingress/egress profiles. A similar analysis using a phase plot of He II intensity is used to det…
Sounder stimulated Dn resonances in Jupiter's Io plasma torus
MacDowall, R. J.; Stone, R. G.; Fainberg, J. +2 more
On February 8, 1992, the Ulysses spacecraft passed through Jupiter's Io plasma torus, where rich spectra of narrow-band resonances were stimulated by the relaxation sounder of the Ulysses unified radio and plasma wave (URAP) instrument. Since the gyrofrequency fg is comparable to the plasma frequency fp in the Io torus, it wa…
Imaging and spectroscopy of Abell 63 (UU Sge).
Pottasch, S. R.; Walsh, J. R.; Walton, N. A.
UU Sge, the eclipsing binary central star of the low- surface-brightness planetary nebula (PN) Abell 63, has been observed spectroscopically in the visible throughout its 11.2 hour period and especially during the minimum. A determination of the spectral types of the components of the binary system has been made. The primary hot central star is an…
Anomalous proper motions in the Cygnus superbubble region.
Jordi, C.; Torra, J.; Comeron, F. +1 more
In an analysis of proper motions of O and B stars contained in the Input Catalogue for Hipparcos, we have found a clear deviation from the expected pattern of systematic motions which can be readily identified with the associations Cygnus OB1 and Cygnus OB9, located near the edge of the Cygnus Superbubble. The anomalous motions are directed outwar…
The Onset of Wolf-Rayet Wind Outflow and the Nature of the Hot Component in the Symbiotic Nova PU Vulpecula
Sion, Edward M.; Shore, Steven N.; Scheible, Maureen P. +1 more
We have analyzed temporal variations in the far ultraviolet He II (1640), Si IV (1393, 1402), and C IV (1548, 1550) line profiles in eight high dispersion, International Ultraviolet Explorer Short Wavelength Prime spectra of the symbiotic nova PU Vul by comparatively examining these profiles on a common velocity scale. We see clear evidence of the…
Interstellar Extinction Toward the CAS OB6 Association: Where is the Dust?
Clayton, Geoffrey C.; Hanson, Margaret Murray
We have completed a multiband (ultraviolet, optical, and near-infrared) study of the interstellar extinction properties of nine massive stars in IC 1805 and IC 1848, which are both part of Cas OB6 in the Perseus spiral arm. Our analysis includes determination of absolute extinction over the wavelength range from 3 micrometers to 1250 A. We have at…
Faint Object Camera Observations of the Shape and Expansion of SN 1987A
Panagia, N.; Jakobsen, P.; Macchetto, F.
New visible and near-UV imagery of SN 1987A obtained 1754 days after outburst with the Faint Object Camera on-board the Hubble Space Telescope is presented. A comparison between these data and previous FOC observations obtained 1278 days after outburst reveal that the supernova dimmed by a factor 0.35 +/- 0.04 between the two observations, corresp…
ULYSSES precise localizations of gamma-ray bursts.
Cline, T.; Hurley, K.; Kouveliotou, C. +10 more
The Ulysses mission is presently about 5 AU from Earth, in the vicinity of Jupiter. It carries a gamma-ray burst detector sensitive to ≈ 15 - 150 keV X-rays, with time resolution down to 8 ms. for the purpose of high accuracy burst localization by the time-of-arrival method. This spacecraft, which is farther from Earth than any previous mission wi…
First Ultraviolet Spectropolarimetry of Radio-selected BL Lacertae Objects
Smith, Paul S.; Allen, Richard G.; Angel, J. R. P.
We present ultraviolet spectropolarimetry of the BL Lac objects OJ 287 and 0754+100 (OI 090.4) acquired with the Faint Object Spectrograph of the Hubble Space Telescope. These are the first such observations of radio-selected BL Lac objects and the polarimetry spans the wavelength range 1580-3300 A in the observer's frame. Neither object exhibited…