Search Publications
Blue companions of cepheids.
Bohm-Vitense, E.; Proffitt, C.
Twenty-one Cepheids, known or suspected to have blue companions, were studied with the International Ultraviolet Explorer satellite. For 13 of them, companions were indeed seen, though they were generally fainter in the UV than expected. For four Population I Cepheids, the suspected companions were not seen. For none of the Population II Cepheids …
The magnetically controled stellar wind of HD 21699.
Sonneborn, G.; Shore, S. N.; Brown, D. N.
The authors report the discovery of a magnetically controlled stellar mass outflow in the helium-weak sn star HD 21699 = HR 1063. IUE observations show that the C IV resonance doublet is variable on the rotational time scale of about 2.5 days, and that there are no other observable spectrum variations in the UV. The magnetic field reverses sign on…
EXOSAT soft X-ray observations of EX Hydrae.
Kahn, S. M.; Mason, K. O.; Cordova, F. A.
During a continuous 26 hour X-ray observation of the 98-min binary EX Hydrae using the CMA detector on EXOSAT, a 67-min modulation was detected with a pulse-fraction of about 30 per cent. The phase of the modulation coincides with that of the 67-min optical modulation which has a pulse-fraction of 15 per cent. The X-ray and optical pulse shapes ar…
Ultraviolet interstellar absorption toward stars in the Small Magellanic Cloud. III. The structure and kinematics of the Small Magellanic Cloud.
Fitzpatrick, E. L.
The structural and kinematic properties of the Small Magellanic Cloud (SMC) were studied by combining IUE satellite observations of individual bright stars (Sk 159 and HD 5980) with existing optical and radio data. It is shown that the SMC has a complex structure due to gravitational interaction with the Milky Way and the Large Magellanic Cloud (L…
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…