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UV observations of the symbiotic star EG And

Pereira, Claudio Bastos

EG And is a S-type symbiotic star. Presented are UV observations made by IUE from 1978 to 1991. From these observations the electron density and the electron temperature were obtained. The size of the HeII emitting region was estimated as 7.3R_⊙. Line and continuum variations confirm the binary nature of EG And.

A search for ³He enhancements in SEP and CIR-associated events with Ulysses/HI-scale.

Biesecker, D. A.

We identify 17 solar energetic particle (SEP) events with enhanced abundances of ³He relative to ⁴He detected by the Heliosphere Instrument for Spectra, Composition, and Anisotropy at Low Energies (HI-SCALE) on the Ulysses spacecraft. These events were all detected while Ulysses was within 5deg of the ecliptic plane, but at d…

First geometrical calibration of the period-luminosity relation of Cepheids from the HIPPARCOS satellite.

Turon, C.; Paturel, G.; Bottinelli, L. +5 more

A sample of the 36 nearest galactic Cepheids was measured with the HIPPARCOS satellite and supplied us with high precision geometrical parallaxes and accurate photometric data. These data are tested against ground based observations and used to determine the first "geometrical" calibration of the period-luminosity relation for nearby Cepheids. Thi…

Models of Explosive Events

Inhester, B.; Innes, D.; Jin, S. -P.

Compositional Mapping of Jupiter's Satellite Io Utilizing High Speed Multifilter Photometry during Mutual Satellite Occultations, 1990-1991

Lane, Arthur L.; Nelson, Robert M.; Hapke, Bruce W. +4 more

We observed selected mutual occultations of Jupiter's satellites in 1990-1991 at four wavelengths and we used the occultation profiles to constrain the areal distribution of selected spectrally active compounds on Io's surface. We performed high speed photometry of Io at four wavelengths while it was being occulted by another Galilean satellite. T…

Observations of energetic particles with EPAC on Ulysses in polar latitudes of the heliosphere.

Franz, M.; Keppler, E.; Quenby, J. J. +3 more

Measurements with the EPAC energetic-charged-particle instrument aboard Ulysses show between -15° and -65° ions and, to some extent, also electrons apparently accelerated by shocks associated with a corotating interaction region (CIR) operating at low latitudes. Particles could have reached Ulysses along magnetic-field lines which connect to the s…

Solar Particles Seen by ULYSSES Near 33 Degrees S

Simnett, G. M.; Tappin, S. J.

Observations of a particle event (electrons >40 keV; ions >50 keV) at heliographic mid-latitudes are presented. The particles are shown to originate from an apparently insignificant solar source and to be stored prior to release into the solar wind.

The International Ultraviolet Explorer - an appreciation

Stickland, D. J.

Ionization stratification in [WR] winds

Schulte-Ladbeck, Regina E.; Herald, James E.

We summarize currently available evidence for ionization stratification in the winds of [WR] stars and point out that ionization stratification may be important to explain with radiation-driven wind theory the winds of [WR] stars, while also providing an empirical tool to investigate [WR] wind structures.

IPS observations of the solar wind at 327 MHz - A comparison with ULYSSES observations

Janardhan, P.; Ananthakrishnan, S.; Balasubramanian, V. +1 more