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The UK contribution to observations of Comet Halley
Cowley, S. W. H.; Green, S. F.; Andrews, P. J. +2 more
The work of organizations in the UK to observe Comet Halley is reviewed. The activities of the Comet Halley UK Coordinating Committee are discussed. Results from space probes are summarized, including Giotto Johnstone Plasma Analyzer, the Giotto Particulate Impact Analyzer, the Halley Multicolor Camera, and the International Cometary Explorer. In …
Effects of SN 1987A on the Interstellar Medium around it
Bohm-Vitense, Erika; Boggs, Don; Morgan, Siobahn
It is shown that the interstellar spectrum from SN 1987A in the LMC shows a rather strong component in C IV and Si IV, and possibly a weak component in N V, at a velocity of about 300 + or - 10 Km/s. In the spectra of the neighboring stars HD38268 and R123, a component at this velocity is only seen in low-ionization lines, not in the C IV, or N V …
X-Ray Emission from Hot DA White Dwarfs - EXOSAT Results and Implications for Atmospheric Models
Paerels, Frits; Heise, John
We present the observations of the photospheric X-ray spectra of hot DA white dwarfs, obtained with the 500 lines mm -1 Transmission Grating Spectrometer on EXOSAT. These spectra cover the full soft X-ray band, at high wavelength resolution and statistical quality. They allow us to do an accurate measurement of the photospheric paramete…
HD 145206 : the first semibarium star with a main-sequence close companion ?
Jorissen, A.; Boffin, H. M. J.
A 12 A/mm photographic spectrum of the binary red giant HD 145206 revealed slightly enhanced s-process lines with respect to standard stars of the same temperature and luminosity. The spectrum closely resembles that of a Ba0.5 semibarium star (following the classification of Keenan and Pitts, 1980) used for comparison. The mass transfer scenario g…
The ultraviolet spectrum of the binary system KS Persei (HD 30353)
Tektunali, H. Gokmen
Nine high- and low-resolution IEU spectra at different orbital phases during different cycles, of the hydrogen-poor single-lined spectroscopic binary KS per (HD 30353) have been studied. The near-UV spectrum is characterized by the presence of several lines of once ionized metals which show the same orbital RV shifts observed in the visual range. …