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Interstellar extinction in the Large Magellanic Cloud
Nandy, K.; Willis, A. J.; Wilson, R. +3 more
Recent UV observations together with complementary visible data of several reddened and comparison stars of similar spectral types in the Large Magellanic Cloud have been used to study the interstellar extinction in that galaxy. Most of the reddened stars studied here are located within 2° of 30 Doradus and show remarkably high extinction in the f…
IUE observations of the UV spectrum of comet Bradfield
Feldman, P. D.; A'Hearn, M. F.; Weaver, H. A. +6 more
Comet Bradfield (1979l), discovered shortly after perihelion, on Christmas day 1979, is characterized by a retrograde orbit of period ~250yr. This orbit was very favourable for observation by the IUE satellite1, and the first observations, the preliminary results of which are reported here, were made on 10 and 11 January 1980. Previousl…
An upper limit to the global SO2 abundance on Io
Owen, T.; Caldwell, J.; Butterworth, P. S. +3 more
Gaseous sulphur dioxide has been detected on Io by the Voyager 1 IRIS experimemt1. It was associated with a major volcanic plume, and it was observable only because the local underlying surface was warm enough (>210K) to be detected near 7 µm, and thereby reveal the gas in absorption. The estimated column abundance of SO2 …
Far UV observations of PKS2155-304
Maraschi, L.; Tanzi, E. G.; Tarenghi, M. +1 more
In BL Lac objects the absence of broad emission lines may be due either to a lack of ionizing continuum or to a lack of cool gas (T <~ 104K)1. UV observations of BL Lac objects are interesting in that they provide a measurement of the continuum, and they include the wavelength range of Lyα, which is in principle the most f…
IUE observations of the atmospheric eclipsing binary system ζ Aurigae
Champman, R. D.
ζ Aurigae is an eclipsing binary star system with a property shared by only a few other systems. It consists of two stars in orbit around one another: a cool supergiant star (spectral type K2 II) and a hot main sequence (spectral type B8 v) star. The supergiant star is nearly 200 times larger than the Sun, while the main sequence star is only abou…
Ultraviolet spectra of asteroids
Butterworth, P. S.; Hunt, G. E.; Moore, V. +2 more
Spectra over the range 2,100-3,200 Å have been obtained for the three largest asteroids-Ceres, Pallas and Vesta-using the International Ultraviolet Explorer (IUE) satellite1. These represent the first detailed UV reflectivity data for asteroids. They extend the numerous measurements already carried out in the visible and IR2,3
IUE observations of the hot components in two symbiotic stars
Kafatos, M.; Michalitsianos, A. G.; Hobbs, R. W. +1 more
Recent IUE observations reveal striking differences in the UV spectra of two symbiotic stars, R Aqr and RW Hya. RW Hya is found to be an unexpectedly intense source of UV radiation. The measurements reported here demonstrate the presence of a hot component in each star, supporting the view that each is a binary system with a luminous red primary a…