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IUE observations of HD 36705.
Rucinski, S. M.
HD 36705 is one of the most rapidly rotating (0.514-day) possibly single late-type (K0/2) stars known. The IUE was used to obtain ten LWR high resolution and five SWP low-resolution spectra in different phases of the rotational period. The FES light curve indicates a rather uniform coverage by spots during the observations. The Mg II emission line…
The International Ultraviolet Explorer (IUE) point spread function at low resolution.
Cassatella, A.; Barbero, J.; Benevenuti, P.
The resolution performances obtainable with IUE low resolution images are reviewed. It is shown that the spatial resolution (perpendicular to the dispersion) is strongly dependent on the telescope focussing conditions while the spectral resolution is not. After determining the telescope optimum focussing conditions, information is provided on the …
On the ultraviolet spectrum of AG Peg.
Penston, M. V.; Allen, D. A.
AG Peg has displayed the slowest known nova outburst. Since the system contains an M giant, it can be classified as symbiotic star. Presented are ultraviolet spectra of AG Peg taken with the IUE satellite. A variety of regimes having characteristically different spectral features is found. These include a high-velocity wind in which high-ionizatio…
Emission lines in the magnetic white dwarf GD 356.
McCarthy, J. K.; Greenstein, J. L.
Spectrographic measurements of the magnetic white dwarf GC 356 are presented, and, two weak emission line Zeeman triplets at H-alpha and H-beta are analyzed. The measurements were carried out using a high signal-to-noise ratio double spectrograph and CCD detectors attached to the Hale 5 meter refector telescope. Multichannel spectrophotometry of G…
An ultraviolet line list for O star spectra.
Bruhweiler, F. C.; Dean, C. A.
Archival high dispersion UV spectra obtained by the IUE satellite, together with laboratory data for the Fe peak ions, reveal more than 550 identifiable spectral features in the far-UV region in the cases of the O subdwarfs BD +75 deg 325 and BD +28 deg 4211, as well as the sharp lined main sequence star HD 46202. The wide range of effective tempe…
Dwarf novae in outburst : monitoring WX Hydri with IUE.
Verbunt, F.; Pringle, J. E.; Hassall, B. J. M.
An account is given of the monitoring of WX Hydri with the International Ultraviolet Explorer (IUE) satellite. The data obtained at the beginning of an outburst show that the rise of the optical precedes that of the ultraviolet flux. Observations during quiescence, together with archival data, indicate that the ultraviolet continuum and line fluxe…
The near-ultraviolet spectrum of the high-redshift BL Lacertae object0215+015.
Blades, J. C.; Pettini, M.; Hunstead, R. W. +1 more
Spectra of the luminous high-redshift BL Lac object 0215+015 have been obtained with the IUE from 2300 to 3150 Å and with the AAT from 3040 to 3870 Å. A total of 66 absorption lines were detected, 50 of which can be identified in the six definite and one probable redshift systems ranging from zabs = 1.254 to zabs = 1.719. Str…
EXOSAT MEDA observations of Cygnus X-3.
King, A. R.; Pounds, K. A.; Willingale, R.
Results of a continuous 30.6-hr X-ray observation of Cygnus X-3 with a large area detector are presented. These show the well known, roughly sinusoidal light curve at the 4.8-hr period, with a phase-dependent variability at short time-scales, and associated spectral behavior. The sinusoidal modulation is interpreted as due to electron scattering i…
On the outer atmospheres of hybrid stars.
Jordan, C.; Dupree, A. K.; Brown, A. +1 more
The authors discuss a variety of ultraviolet observations of four hybrid atmosphere stars, objects which exhibit both cold winds and high-temperature (transition-region) emission. New IUE data confirm that the K3 II stars ι Aur and θ Her are hybrid stars. In addition γ Aql (K3 II) is found to be another hybrid object. The analysis of the emission …
LSS 2018 : a double-lined spectroscopic binary central star with an extremely large reflection effect.
Drilling, J. S.
LSS 2018, the central star of the planetary nebulae DS1, was found to be a double-lined spectroscopic binary with a period of 8.571 hours. Light variations with the same period were observed in U, B, and V; in the wavelength regions defined by the two IUE cameras; and in the strength of the CIII 4647 emission line. The light variations can be accu…