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IUE spectral analysis of the Be star HD 184279.

Hirata, R.; Dawanas, D. N.

Luminosity of large amplitude variable stars: Comparison between ground-based predictions and observations by the Hipparcos satellite

Barthes, D.; Mennessier, M. O.; Davies, P.

Since November 1989, the HIPPARCOS satellite has been observing stars in order to fulfil its mission goals. The complete data processing of these observations will take many years to perform. A small group of stars, namely the large amplitude variables, must be processed much closer to real-time so that the luminosity ephemeris can be updated wher…

X-ray astronomy in its thirtieth year.

Pounds, K. A.

An overview is given of current activities and future prospects in the X-ray astronomy field with attention given to the British involvement in the Ginga, Rosat, and Exosat projects. The large array of proportional counter detectors for the Ginga astronomy satellite is described in detail with respect to studying time variability. The Rosat X-ray-…

Cometary ion distributions near the pickup energy outside comet Halley's bow shock

Coates, A. J.; Neugebauer, M.; Gombosi, T. I. +2 more

This paper compares calculated and measured energy spectra of implanted H⁺ and O⁺ ions on the assumption that the pick-up geometry is quasi-parallel and about 1% of the waves generated by the cometary pickup process propagates backward (towards the comet). The model provides a good description of the implanted O⁺ a…