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Detection of acetylene in the Saturnian atmosphere, using the IUE satellite.
Moos, H. W.; Clarke, J. T.
Direct evidence for the presence of acetylene in the upper part of the Saturnian atmosphere is reported. This evidence consists of two spectra of Saturn obtained by using the low-dispersion mode of the short-wavelength spectrograph on the IUE satellite. A series of distinct absorption bands in the reflected solar radiation at 1750 A is attributed …
IUE observations of the quasar 3C 273.
Boggess, A.; Lane, A. L.; Oke, J. B. +9 more
IUE observations indicate that the spectrum of 3C 273 is similar to that of other large-redshift quasars. There is a large excess of flux in the range 2400 A to 5300 A, which encompasses the Balmer jump region but which does not appear to be explainable by Balmer emission. The intensity ratio of Lyman-alpha to H-beta is 5.5, in agreement with othe…
IUE spectra of the nuclei of M31 and M32.
Johnson, H. M.
Observed spectra are reproduced in the 1000-3400 wavelength range; line identifications are tabulated, and spectrophotometry of parts of the continua is given. The flux density of a few line emissions can be estimated from their equivalent widths. The strongest line emissions differ in the two nuclei, and they do not fit spectral patterns that are…
The effective temperature, radius, rate of mass loss and luminosity of P Cygni, HD 190603, kappa Cassiopeiae, and rho Leonis.
Underhill, A. B.
The method developed by Underhill et al. (1979) is applied to P Cyg (B1 Iap), HD 190603 (B1 Ia+), kappa Cas (B1 Ia), and rho Leo (B1 Ib or Iab) using the S2/68 absolute UV photometry for faint stars (Thompson et al., 1978) and the 13-color photometry. Some profiles of the UV resonance lines are presented, and the implication of pertinent data for …
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…