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Entry of galactic electrons into the high latitude heliosphere
Simnett, G. M.; Tappin, S. J.; Roelof, E. C.
Evidence is presented for the first detection of galactic cosmic ray electrons in the general energy range 1 to 20 MeV by the HI-SCALE instrument on Ulysses as it passed over the solar poles. The electrons manifest themselves by a strong latitude dependence of the background counting rates in the HI-SCALE detectors, in excess of that predicted fro…
Some problems of the detection of the high energy gamma-radiation in space
Fradkin, M. I.; Ginzburg, V. L.; Kurnosova, L. V. +8 more
The flux of the diffuse gamma-radiation in the Galaxy was measured with the instruments on board of the satellites COS-B and Compton Gamma Ray Observatory (CGRO). It was shown that the spectrum of the diffuse gamma-rays N(E) in the energy range from very low energy (some tens keV) up to some GeV may be represented by the expression N(E) = AE^kdE, …
The IUE Spectrum of the "O VI Sequence" Planetary Nebula He 2-55
Feibelman, Walter A.
The first IUE observations of the "O VI Sequence" planetary nebula He 2-55 are reported. The ultraviolet spectrum is dominated by strong emission lines of O V, C IV, He II, and C III], plus a number of weaker ions for which emission line fluxes were measured. N V lambda 1240 and C IV lambda 1549 show P Cygni profiles. The stellar terminal wind vel…
Ulysses-Voyager Study of Energetic Particles Associated With the Intense Solar Activity of March/June 1991
Keppler, E.; Reuss, M. K.; McDonald, F. B.
The intense solar activity centered in March and June 1991 produced some of the largest interplanetary disturbances over the past several solar cycles. For these events the Ulysses EPAC energetic particle observations near 3 AU are compared with those of the Voyager 2 CRS experiment near 35 AU. At Voyager 2 there is a single long-lived event exten…
Winds and Accretion in delta Sagittae
Mason, Brian D.; McAlister, Harold A.; Eaton, Joel A. +1 more
The ten-year binary delta Sge (M2 Ib-II+B9.5 V) is a zeta Aur binary containing an abnormally cool component. Combining our analysis of the system as a visual binary with Batten's radial-velocity solution leads to the following properties: i = 40 deg, a = 51 mas = 8.83 A.U. = 1893 solar radius, hence d = 173 pc; MB = 2.9 solar mass and …
Circumstellar gas and dust in 68 Ophiuchi (A0 IVe).
Waters, L. B. F. M.; Grady, C. A.; The, P. S. +10 more
We present photometry and spectroscopy of the A0IVe star 68 Ophiuchi, for which Vidal-Madjar et al. (1993) suspected the presence of a circumstellar disc of material similar to that found around β Pic. The UV and optical continuum agrees well with a Kurucz model with parameters that are consistent with the spectral type. 68 Oph is detected at 12 a…
Spectropolarimetry of the dwarf nova IP Peg
Dhillon, V. S.; Rutten, R. G. M.
We present spectropolarimetric observations of the eclipsing dwarf nova IP Peg in quiescence. The data show linear polarizations with a mean value of 0.10+/-0.06 per cent. There are no significant differences between the continuum and line polarizations and no significant variations with wavelength or binary phase. We argue that the measured polar…
Multiwavelength observations of the bright QSO HS 0624+6907.
Clavel, J.; Reimers, D.; Heber, U. +9 more
We present non-simultaneous multi-wavelength observations of the bright radio-quiet QSO HS 0624+6907 (V=14.2, z=0.37) discovered by the Hamburg Survey (Groote et al. 1989). HS 0624+6907 has a particularly strong UV-soft X-ray bump which turns over already at the shortest IUE wavelengths, and it has a steep (Photon index {GAMMA}=-2.9) soft X-ray sp…
Toward the HIPPARCOS link: astrometry of stars and extragalactic sources in the field of the spiral galaxy M51.
Brosche, P.; Odenkirchen, M.
We present absolute proper motions of 14 Hipparcos stars from ground based photographic astrometry in a 2x2deg field around the spiral galaxy Messier 51. These are part of a catalogue of 340 stars with B<=16, for which positions, proper motions, and B magnitudes have been derived from a series of 16 photographic plates. Due to large epoch diffe…
A Search for Stellar Flares in Gamma-Ray Bursts Observed by BATSE and ULYSSES
Hurley, K.; Fishman, G. J.; Kouveliotou, C. +2 more
We have searched for gamma-ray bursts during stellar flares using Ulysses and BATSE/CGRO data and for a correlation between flare star positions and burst positions. More than 3000 stellar flares have been identified optically, but neither BATSE nor Ulysses observed any gamma-ray bursts which could be attributed to them. Using the BATSE trigger th…