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NGC 6868 : a merger with dust and extended Ly-alpha emission.
Norgaard-Nielsen, H. U.; Jorgensen, H. E.; Hansen, L.
We present IUE observations of the E2 galaxy NGC 6868 showing extended Lyα emission and a weak UV continuum source which also seems extended. Along the lines of sight to the Lyα clouds the column density of neutral hydrogen must be extremely low. Ground based CCD imaging shows the distribution of interstellar dust and optical emission line gas. Ou…
The X-Ray Cooling Flow in the Cluster of Galaxies around PKS 2354-35
Remillard, Ronald A.; Tuohy, I. R.; Schwartz, Daniel A. +1 more
A position measured with the HEAO 1 Scanning Modulation collimator suggested the group of galaxies surrounding the radio galaxy PKS 2354-35 as the identification of the bright, hard X-ray source 4U 0009 - 33 = 3A 2356 - 341 = 1H 2355 - 350. We confirm this identification with measurements of the position and spatial extent using the EXOSAT CMA det…
A Spectrophotometric Atlas of White Dwarfs Compiled from the IUE Archives
Wegner, Gary; Swanson, Steven R.
Ultraviolet spectrophotometric data are presented for 182 subluminous stars, mostly white dwarfs, that have been observed with the low-resolution mode of the IUE satellite since 1978 and for which archived data became available on April 1, 1989. Tables of 20 A binned data are given for all stars. Of these, 133 cover the entire wavelength range of …
The Ultraviolet Continuum and the Fluorescent H 2 Lines in Low-Excitation Herbig-Haro Objects
Boehm, K. H.; Solf, J.; Scott, D. M.
Long-exposure IUE observations are used here to determine the spatial distribution of the fluorescent H2 line emission in the low-excitation objects HH 43 and HH 47. In HH 43, the spatial distribution of the fluorescent H2 line emission has a width equal to or smaller than the width of the point-spread function of IUE, while both the short-wavelen…
EXOSAT Observations of the Seyfert 1 Galaxy NGC 3516
Ghosh, K. K.; Soundararajaperumal, S.
Results of the X-ray spectra (0.1-10 keV) of the Seyfert galaxy NGC 3516 are presented based on the EXOSAT observations obtained on four epochs between 1985/308 and 1985/340. The data were obtained from the EXOSAT archives. The soft X-ray (0.1-2 keV) flux of this galaxy varied by a factor of ~3 on the time scales of 2 days, and that for the hard X…
SI II emission line diagnostics.
Judge, P. G.; Carpenter, K. G.; Harper, G. M.
The present study compares ratios of Si II UV emission lines in a variety of objects with computations based on recently published collisional data of Dufton and Kingston (1991). A high-quality spectrum of Alpha Tau (K5 III) obtained by Carpenter et al. (1991) is analyzed using the G270M mode of the GHRS on the HST, in addition to high-dispersion …
Ultraviolet High-Excitation Fe II Fluorescence Lines Excited by O vi, C iv, and H i Resonance Emission As Seen in IUE Spectra
Feibelman, Walter A.; Johansson, Sveneric; Bruhweiler, Frederick C.
Archival high-dispersion spectra from the IUE are used in a search for Bowen emission lines of Fe II excited by the stronger transition of the O VI resonance doublet. The possibility of using these Fe II emission lines as a diagnostic of the strength of the far-ultraviolet emission of O VI at 1032 A is explored. It is found that the Fe II emission…
The Interoutburst Behavior of Cataclysmic Variables
Szkody, Paula; Mattei, Janet A.; Waagen, Elizabeth O. +1 more
Existing IUE and AAVSO archive data were used to accomplish a large scale study of what happens to the UV flux of accretion disk systems during the quiescent intervals between outbursts, and how it relates to the preceding outburst characteristics of amplitude and width. The data sample involved multiple IUE observations for 16 dwarf novae and 8 n…
The Far Ultraviolet Spectrum of the Be-Star Ax-Monocerotis
Danezis, E.; Laskarides, P. G.; Theodossiou, E.
In this paper we study the main features of the far UV spectrum of the binary star AX Mon, observed with the IUE satellite at phase 0.568. Ions indicating a large range of ionization stages, going fromCI,OI,NI toSIV,CIV,NV are present. The spectrum is dominated by shell absorption lines of FeII, FeIII, SiIII,CII, AlII, MgII and NiII. Two satellite…
H-Beta Photometry of V1010 Ophiuchi
Corcoran, M. F.; Guinan, E. F.; Siah, M. J.
An analysis is presented of previously unpublished intermediate and narrow band H-beta light curves of the short period eclipsing binary V1010 Oph. The temperature of the primary is determined directly by comparing the UV continuum with Kurucz model atmospheres and solve the broadband lightcurve using the Wilson-Devinney program. The present solut…