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The first UV spectrum of 2060 Chiron*
Brosch, N.
Chiron was observed for the first time in the UV, approximately one year before its perihelion passage, with the IUE satellite. Three long-wave, low-dispersion spectra were obtained, representing a total exposure of 56400s. The spectra contain useful information, though with very low S/N ratio, longward of ~2550A. No emission from gaseous species …
Expanding our knowledge of the heliosphere
Page, D. E.
Milestones on our road to understanding the heliosphere between 1950 and 1988 are recalled. Among these are early studies of solar energetic particles suggesting a heliospheric boundary at 5 AU, the discovery of the solar wind and the sectored nature of the interplanetary magnetic field. Recent results, particularly from the Ulysses spacecraft, co…
Discovery of Faint Ultraviolet Sources in the Globular Cluster NGC 6624 with the Hubble Space Telescope
Cool, Adrienne M.; Sosin, Craig
Using the Faint Object Camera (FOC) on the Hubble Space Telescope (HST), we have identified three faint ultraviolet sources in the innermost ~15 arcseconds of the globular cluster NGC 6624. These sources are in addition to the previously discovered UV counterpart to the X-ray source 4U 1820-30, which is observed in the same field. At 1400 A, the s…
Interpretation of a glitch observed in the very small dust grain data at halley's comet: (Letter to the Editor)
Kissel, Jochen; Utterback, Nyle G.
In a previous article describing the cloud of attogram dust particles surrounding Comet Halley, the present authors noted a sharp break in the curve of signal amplitude (related to particle size) versus distance to the comet. Arguments were given which supported the explanation that the break was instrumental rather than due to a physical structur…
UV observations of the polar system RE 1938-461.
Mukai, K.; de Martino, D.; Mouchet, M. +1 more
We present IUE orbital phase resolved observations of the polar system RE 1938-461. We detect a strong variability of the prominent emission lines, C IV (1550 A), He II (1640 A) and N V (1240 A) at the orbital period of 140 min. Line velocity shifts are also detected with amplitudes and phasing consistent with those of the optical lines. We sugges…
Solar wind corotating interaction regions: The third dimension
Gosling, J. T.
A new dimension has recently been added to our understanding of solar wind structure - the dimension out of the solar equatorial plane. Measurements made by the Ulysses space probe at high heliographic latitudes and powerful new 3-dimensional numerical simulations have revealed that solar wind corotating interaction regions (CIRs) tend to be tilte…
Elemental Abundances in Corotating Interaction Regions at High Solar Latitudes
Lanzerotti, L. J.; Maclennan, C. G.
Throughout 1993, as the Ulysses spacecraft traveled from ∼23° to ∼45° south heliolatitude, the HI-SCALE instrument on the spacecraft measured a recurrent series of enhanced particle fluxes with a recurrence period of ∼26.5 days. These particles are accelerated from a background seed population by the corotating interaction regions (CIRs) associate…
Variability of IUE Spectra of the Pulsating Nucleus of the Planetary Nebula K 1-16
Bond, Howard E.; Feibelman, Walter A.; Kaler, James B. +1 more
We report on some subtle changes which were detected in old IUE low dispersion spectra of the pulsating central star of the planetary nebula K 1-16. Although most of the data were taken more than ten years ago, the improved data reduction techniques and more accurate line identifications that have become available only recently permit measurement …
The three-ring structure of Supernova 1987A
Burderi, L.; King, A. R.
The current scenario for the complex <=3-arcsec structures surrounding SN 1987A is that they result from the emission of a thin shell of matter surrounding the supernova, illuminated by the initial extreme-ultraviolet flash from the explosion of the progenitor. Before the Hubble Space Telescope (HST) the two ring-shaped loops, ~3 arcsec in size…
WFPC2 Images of Multiple Nuclei in Nearby Active Galactic Nuclei
Gorjian, Varoujan
High-resolution images have been made with the Hubble Space Telescope of the cores of three active galaxies: Mrk 348, Mrk 516, and Mrk 789. The 500 s images were taken using the WFPC2 camera with the F606W filter. Each galaxy exhibits structure which may be interpreted as multiple nuclei. Mrk 348 appears to have two nuclei, although it is possible…