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IUE observations of gas stream effects in the ultraviolet spectrum of U Cephei.
Kondo, Y.; McCluskey, G. E.; Stencel, R. E.
The eclipsing binary U Cephei has been observed with the International Ultraviolet Explorer (IUE) satellite. Nine high-resolution spectra in the mid-ultraviolet (1900-3200 A) and one high-resolution spectrum in the far-ultraviolet (1200-1900 A) were obtained. The effects of gas streaming are clearly seen in the mid-ultraviolet resonance lines of F…
The EUV spectra of young planetary nebulae.
Nussbaumer, H.; Schild, H.; Flower, D. R.
High- and low-resolution EUV observations of the possible young planetary nebulae V1016 Cyg, HM Sge, and IC 4997 are reported which were made with the IUE satellite over the wavelength ranges from 1150 to 1950 A and from 1900 to 3200 A. The strongest emission lines observed in V1016 Cyg are identified, the spectra of the three objects in the regio…
The ultraviolet spectrum of the eclipsing binary Epsilon Aurigae.
Hack, M.; Selvelli, P. L.
A UV spectrum of the eclipsing single-line spectroscopic binary Epsilon Aur is analyzed which was obtained by the IUE satellite in the wavelength range from 1150 to 3200 A. The continuous and line spectra are examined, and parameters of the binary system are derived. It is concluded that the system consists of an F0 Ia primary with an absolute vis…
The accretion picture of Cen X-3 as inferred from one month of continuous X-ray observations.
van der Klis, M.; Bonnet-Bidaud, J. M.
COS-B X-ray observations of Cen X-3 in December 1975 include a turn-on of the source and a high state extending over the rest of the observation period, during which a clear transition in intensity occurs. These data are used to show that the accretion picture of Cen X-3 is reconcilable with a stellar wind only by taking the most extreme assumptio…
Maximum-entropy image processing in gamma-ray astronomy.
Strong, A. W.; Bennett, K.; Skilling, J.
In order to make the fullest use of the information contained in data from a spark-chamber telescope, an image processing approach, is required. It is shown how the maximum-entropy reconstruction technique can be applied in a modification appropriate to a situation of low statistical weight per resolution solid angle, as usually occurs with presen…
IUE observations of 32 Cygni: the effects of the B star within the upper chromosphere of a late-type supergiant.
Kondo, Y.; McCluskey, G. E.; Stencel, R. E. +1 more
The object 32 Cygni is a Aurigae-type system, comprised of a KS supergiant and a dwarf, which undergoes atmospheric eclipses. We have obtained high-resolution ultraviolet spectra of this system with IUEnear orbital phase 0.2, covering the 1175-3000 A region. The UV spectrum is striking, since all resonance and other strong lines exhibit marked P C…
IUE observations of absorption by hot gas in the nebula NGC6888
Nussbaumer, H.; Willis, A. J.; Wilson, R. +2 more
New UV observations of Wolf-Rayet stars obtained with the IUE satellite show narrow absorption components in the highly ionized species of Si IV and C IV. In the case of the WN6 star HD 192163 each resonance transition in the above ions exhibits two components, one undisplaced in wavelength and one blueshifted. The latter components are shown to a…
The ultraviolet spectrum of comet Seargent 1978m.
Keller, H. U.; Owen, T.; Smith, A. M. +5 more
UV spectrograms of Comet Seargent (1978m) have been obtained with the IUE satellite in the low- (1.8-nm) and high- (0.1-nm) dispersion modes. In the long-wavelength region (189-340 nm) emission bands of OH, CS, CO2(+), NH, and CO(+) can be identified, and the rotational structure of OH could clearly be resolved. In the short-wavelength region (119…
Observations of 3C 390.3 with the International Ultraviolet Explorer.
Perryman, M. A. C.; Ferland, G. J.; Longair, M. S. +1 more
Observations of the radio galaxy 3C 390.3 made with IUE are presented; these allow separate determinations of the Lyman/Balmer ratios in both the narrow and broad emission-line regions. The broad-line L-alpha/H-alpha ratio confirms the anomalous results found previously in quasars; in this case a ratio is found about 15 times smaller than that pre…
Oxygen VI in stellar winds.
Morton, D. C.
A review of observational evidence for five-times ionized oxygen (OVI) in stars and new high-resolution spectral scans obtained with Copernicus satellite are presented to show how this phenomenon varies with spectral type. The region of the OVI resonance doublet was observed in nine stars with the Copernicus spectrometer, and P Cygni profiles or s…