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Hypervelocity dust particle impacts observed by the Giotto Magnetometer and Plasma Experiments
Coates, A. J.; Glassmeier, K. -H.; Neubauer, F. M. +3 more
We report thirteen very short events in the magnetic field of the inner magnetic pile-up region of comet Halley observed by the Giotto magnetometer experiment together with simultaneous plasma data obtained by the Johnstone plasma analyzer and the ion mass spectrometer experiments. The events are due to dust impacts in the milligram range on the s…
Small-Scale Structure in the Diffuse Interstellar Medium
Meyer, David M.
The initial results of a study to probe the small-scale structure in the diffuse interstellar medium (ISM) through IUE and optical observations of interstellar absorption lines toward both components of resolvable binary stars is reported. The binaries (Kappa CrA, 57 Aql, 59 And, HR 1609/10, 19 Lyn, and Theta Ser) observed with IUE have projected …
The nucleus of Abell 35 : a cataclysmic binary ?
Jasniewicz, G.; Acker, A.
Simultaneous photometric and spectroscopic observations of the visible central star BD - 22 deg 3467 of the large planetary nebula Abell 35 are reported. This fast rotating star has a spectral type G8IV, and shows a double peaked emission line at H-alpha, varying with a period identical to the photometric one, equal to 0.7653 days. Both the maximu…
Discovery of a highly ionized, low mass-loss wind and a corona seen in absorption in the G9 II star HR 6902.
Reimers, D.; Baade, R.; Schroeder, K. -P.
IUE observations of HR 6902 (G9II + B9V) 1 and 2 days before and during total eclipse of the B star are discussed. The G bright giant has a highly ionized, hot (Te = 87,000 K) wind seen as C IV, Si IV, and C II resonance-line scattering of B-star photons during totality, with a mass-loss rate of 2 x 10 to the -11th solar mass/yr (+ or - factor 3).…
A Catalogue of Low-Resolution IUE Spectra of Dwarf Novae and Nova like Stars
La Dous, Constanze
A catalogue is presented of all the low-resolution IUE spectra of dwarf novae and nova-like stars that were recorded until the end of 1987. All spectra have been reduced, and are displayed, in a homogeneous way. In addition to details about these data, to the extent available, their position in the outburst light curves is given, physical informat…
UV observations of Herbig-Haro objects associated with bipolar molecular outflows : HH 7, HH 11 and HH 29.
Liseau, R.; Cameron, M.
Results are presented of IUE observations of three shock excited visible Herbig-Haro nebulae: HH7, HH 11, and HH 29. With the possible exception of HH 11, large deviations were found from the 2 2S-1 2S two-photon decay continuum of atomic hydrogen. It was also found that the continuum of HH 29 varies considerably in both the intensity and the spec…
Simultaneous X-Ray, Ultraviolet, and Optical Observations of LMC X-3
Maraschi, L.; Tanzi, E. G.; Belloni, T. +7 more
The black hole candidate LMC X-3 was observed simultaneously at X- ray (Ginga), UV (IUE), and optical frequencies in 1988 January. The X- ray energy distribution is the superposition of a thermal component and a hard tail. The former component can be described equally well by a Comptonization spectrum or by a disk blackbody. In the latter picture,…
Raman scattering as a diagnostic tool in the massive X-ray binary 4U1700 - 37
Hammerschlag-Hensberge, G.; Kaper, L.; Takens, R. J.
HD153919, an extreme Of star (spectral type O6.5Iaf+; ref. 1) has been identified as the optical counterpart of the 3.411-day eclipsing massive X-ray binary 4U1700 - 37 (ref. 2) by spectroscopic3-5 and photometric6 studies which revealed periodic optical variations in phase with the X-ray period. Here we report tha…
Ultraviolet Observations of NGC 205
Bertola, Francesco; Wilcots, Eric M.; Hodge, Paul +2 more
Low-resolution IUE observations of the dwarf elliptical galaxy NGC 205 show that the UV spectral energy distribution of the galaxy is relatively flat. Spectra centered on the nucleus and on a region north of the nucleus show evidence of recent "bursts" of star formation which contribute strongly to the UV spectral energy distribution. We fit the U…
Effective temperatures of RCB stars.
Evans, A.; Bode, M. F.; Albinson, J. S. +1 more
IUE observations and optical-IR photometry are reported for a number of R Coronae Borealis stars, including the LMC object W Men. Non-line-blanketed, hydrogen-deficient model atmospheres are normalized to the data in the IR to determine effective and color temperatures. By comparing stellar flux distributions with model atmosphere calculations, wa…