Search Publications
Detection of diffuse LY alpha emission from cD galaxy in Abell 1795.
Norgaard-Nielsen, H. U.; Jorgensen, H. E.; Hansen, L.
The authors report the discovery of diffuse Lyα emission from the cD galaxy in Abell 1795 which has a high X-ray derived mass accretion rate. The Lyα emission coincides with the main optical filamentary structures and the Lyα/Hβ ratio is close to the recombination v…
Mass loss from the central star of NGC 3242.
Pottasch, S. R.; Hamann, W. -R.; Kudritzki, R. -P. +1 more
The central star of NGC 3242, which was classified to be of "continuous type" before Kudritzki et al. (1981) discovered and analysed photospheric absorptions, has been observed with IUE in high resolution. The N V resonance doublet exhibits a weak P Cygni profile with photospheric components. Theoretical profiles are obtained from comoving-frame c…
Changes in the ultraviolet spectrum of EG Andromedae.
Stencel, R. E.
Ultraviolet observations of EG Andromedae, a symbiotic star, are reported which clearly show pronounced eclipse-like effects on the high-temperature far-UV continuum. Continuum and emission-line variations with phase are reported and related to synoptic hydrogen alpha data. System parameters are characterized.
The central star of the planetary nebula Abell 78.
Feibelman, W. A.; Kaler, J. B.
The authors have studied the ultraviolet spectrum of the nucleus of Abell 78, one of the two planetaries known to contain zones of nearly pure helium. Abell 78 is strikingly similar in many respects to Abell 30, the other planetary with embedded helium knots. The ultraviolet-optical color temperature, which the authors tentatively identify with th…
Blueshifted narrow absorption components in the ultraviolet spectrum of the binary V861 SCO (HD 152667).
Howarth, I. D.
Blueshifted narrow absorption lines have been studied in 14 high resolution IUE spectra of the B0 Ia+B2 V binary V861 Sco. The column densities of C II ions producing the λ1335 P Cygni feature and narrow absorptions have been estimated by profile fitting and velocities measured with respect to interstellar lines. The narrow absorption lines have a…
IUE observations of the clusters of the Magellanic clouds.
Rich, R. M.; Persson, S. E.; Cohen, J. G.
IUE observations of 17 clusters in the Large Magellanic Cloud are presented. The derived ultraviolet colors become progressively redder as the cluster's classification in the scheme of Searle, Wilkinson, and Bagnuolo increases. With the aid of theoretical models of the integrated light of coeval clusters of varying ages, it is shown that the SWB c…
The EXOSAT imaging X-ray detectors.
Culhane, J. L.; Branduardi-Raymont, G.; Corbet, R. H. D. +3 more
The detection of the F1 IIu-X1 +g system of diatomic carbon toward X Persei.
Lien, D. J.
The 0-0 vibrational band of the F1Pi(u)-X1Sigma(+)g electronic system of C2 has been detected with the IUE in the interstellar medium along the line of sight toward X Per. A column density of 3 (+ or - 1) x 10 to the 12th/f(00) per sq cm was derived by a profile fitting method. The lower limit for 0-0 band oscillator strength was determined from a…
Sigma Geminorum (K1 III + ?) : variability of the ultraviolet emission lines near conjunction.
Linsky, J. L.; Simon, T.; Ayres, T. R.
Far-ultraviolet IUE echelle spectra are reported of the moderate-period RS CVn system σ Geminorum. Despite the location of the red giant primary of σ Gem in a portion of the H-R diagram where cool stellar winds are common, no evidence is found for circumstellar absorption features or blueward asymmetries in the chromospheric O I emission cores. Ho…
X Cygni : duplicity, period stability and atmospheric velocity structure.
Evans, N. R.
Observations of X Cygni which can be used as tests of duplicity are discussed, including light variations, ultraviolet spectra, radial velocities, and period variations. IUE observations show no sign of a blue companion in the 2500-3000 A region, ruling out a single companion more massive than about 2.5 solar masses. The high luminosity of X Cygni…