Search Publications
Detection of periodic light variations in the old nova V603 AQL (1918).
Boggess, A.; Drechsel, H.; Krautter, J. +2 more
Periodic visible light variations of the old nova V 603 Aql (1918) were detected with the Fine Error Sensor Instrument (FES) aboard the IUE satellite. Continuous observations were carried out during more than two complete cycles. The light curve shows a broad maximum and a pronounced minimum which was covered three times, and is tentatively interp…
I.U.E observations of HD 102567, the proposed optical counterpart of 4U 1145-61.
Bianchi, L.; Bernacca, P. L.
The B1V star HD 102567, proposed optical counterpart of the X-ray source 4U 1145-61, has been observed with the two SWP and LWR cameras on board the IUE satellite in the low resolution mode. Observations were carried out on October 5 and 14, 1978 both with the small and large spectrograph's slits. The flux has been calibrated by using the new inte…
The ultraviolet flux of HD 122563.
Gustafsson, B.; Gahm, G. F.; Bell, R. A. +1 more
Previous work has suggested that the very metal deficient giant stars are brighter in the near ultraviolet than are the corresponding model atmospheres. Observations of the star HD 122563 made with the IUE satellite suggest that this difference is less significant and may well be nonexistent at wavelengths less than 2700 A.
Far-ultraviolet observations of Cygnus X-2.
Maraschi, L.; Tanzi, E. G.; Treves, A.
Two far-ultraviolet (1150-1950 A) spectra of V 1341 Cyg identical with Cyg X-2, taken with the International Ultraviolet Explorer, at orbital phase 0.3 and 0.6 show an intensity variation of a factor of 2. Strong emission lines (N V, Si IV, and He II) are apparent on a poorly defined continuum. The observations can be interpreted in terms of UV em…
Ultraviolet spectroscopy of F and G supergiants with the IUE. I. First results on Cepheid variables.
Parsons, S. B.
The analysis deals with the bright Cepheids observed from the IUE satellite, over several days, at a speed and spectral resolution suitable to study both the cores of Mg II at 2796 and 2803 A and the presence and strength of the more prominent emission lines in the far ultraviolet. The observations are discussed in some detail. Some qualitative re…
QSO evolution and the intergalactic medium.
Sherman, R. D.
A model is developed of a cold, photoionized intergalactic medium in which only discrete, evolving sources (quasars) produce the observed extragalactic hard X-ray background. Constraints on the model are imposed by observed optical depth limits to various redshifts, far UV and visible flux measurements, X-ray background and source counts in the re…
Ultraviolet observations of AM Her.
Tanzi, E. G.; Tarenghi, M.; Howarth, I. D. +3 more
Seven UV spectra (1150-3200 A) of AM Her were obtained with the low-resolution spectrometer of the IUE satellite. It is found that strong emission features appear to be superimposed on a well-defined continuum, which is fitted well by a lambda to the -2nd law. Observations are compared with expectations from models of the source.
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…
High dispersion EUV observations of planetary nebulae.
Wehrse, R.; Koeppen, J.
The three high-excitation planetary nebulae NGC 3242, NGC 7009, and NGC 6210 have been observed by the IUE satellite in the 1190-1930 A wavelength range using the high resolution mode. The most prominent emission lines are the He II 1640 A and C III 1909 A lines. The C IV 1550 A lines of NGC 3242 and NGC 7009 are in emission but weaker than in NGC…
IUE observations of Large Magellanic Cloud members.
Nandy, K.; Morgan, D. H.
Spectra and flux distributions in the wavelength range 1150-3100 A are presented for six supergiants ranging from O to late B in the Large Magellanic Cloud. The stars were observed with the IUE in its low resolution mode.