Search Publications
The Fe II emission in the UV spectrum of CH Cyg.
Selvelli, P. L.; Marsi, C.
Fe II emission lines are present in all UV spectra of CH Cyg, with a great increase in number and intensity since 1985. The authors give a list of emission intensities and equivalent widths for the prominent Fe II lines. Optical depth effects are clearly evident from a comparison of the relative emission intensities within couples of multiplets wh…
COS-B upper limit to the greater than 70 MeV gamma-ray flux from a gamma-ray burst event of 1979 November 9
Clements, D. L.; Williams, O. R.; Sumner, T. J. +1 more
Using the COS-B data base an upper limit of 2×10-7cm-2s-1keV-1 has been set to the high energy (70 - 1000 MeV) gamma-ray burst flux from a gamma-ray burst event of 1979 November 9. This limit is consistent with a power law extension from the lower energy data with a differential index of ≤-1.39. An upper…
Measurements of Balmer emission line profiles for southern Be stars. II. New data and radial velocities.
Bouchet, P.; Dachs, J.; Hanuschik, R. +6 more
The results of an analyses of more than 500 H alpha, H beta and H gamma line profiles from 55 bright Be and mostly early type Be shell-type stars over the period 1980-83 are reported. The photoelectrically-determined spectra were reduced for equivalent widths and half-widths at different epochs, 200 Balmer line profiles and variations, and radial …
An atlas of high resolution IUE ultraviolet spectra of 14 Wolf-Rayet stars.
Willis, A. J.; van der Hucht, K. A.; Conti, P. S. +1 more
The authors present an atlas of high resolution (Δλ = 0.1 - 0.2 Å) IUE ultraviolet spectra of 14 galactic Wolf-Rayet stars (9 WN and 5 WC). For each star the wavelength ranges covered are λλ1150 - 2050 and λλ1850 - 3250. The spectral data are presented in the form of line identification lists and spectral tracings. Where possible the authors have …
Scattered light in the IUE spectra of epsilon Aurigae.
Kondo, Y.; Stencel, R. E.; Chapman, R. D. +1 more
Recent infrared photometry indicates that the alleged disk of particulate matter surrounding the mysterious secondary object in the Epsilon Aur system is cold, around 500 K. IUE spectra, on the other hand, contain significant flux in excess of that expected from an F0 Ia star in the far UV, which if interpreted as a hot secondary star leads to a p…
The ultraviolet spectrum of the Be star HD 50138.
Hutsemekers, D.
The ultraviolet spectrum of the B8 Ve star HD 50138, recorded during the December 1978-January 1982 period with IUE, is analyzed. The spectrum is found to be crowded by absorption lines, mostly those of singly ionized iron peak elements. In addition there are broad lines essentially due to superionized species (Si IV, C IV) and a P Cygni profile f…
Abundance analysis from the UV spectrum of the He-w star HR 6000.
Hack, M.; Castelli, F.; Morossi, C. +1 more
A high resolution spectrum of the He-w star HR 6000, covering the SW and LW regions, has been analyzed. A fully line-blanketed model atmosphere with parameters T(e) = 14,000 K, log g = 4, microturbulence xi = 2 km/s has been adopted. This model is in agreement with the photometric data and yields the same abundance for the Fe II and Fe III ions. B…
Photometric variations of the irregular variable V348 Sgr.
Jones, D. H. P.; Manfroid, J.; Heck, A. +2 more
The authors report visual estimates and photometric observations in various wavelength ranges of the irregular variable V348 Sgr. They cover dramatic drops of brightness (from V ≈ 12.5 to ≈ 18) which occurred in 1972, 1973 and 1981 with a time scale much shorter than the characteristic time mentioned by previous observers. These deep minima are, t…
UV fluxes of population II stars.
Cacciari, C.
A catalogue of IUE ultraviolet fluxes and calibrated plots for 36 metal-poor field halo stars is presented. The fluxes at 5 Å intervals cover the wavelength range λλ1155 - 3195, or λλ1955 - 3195 for cool stars. For all these stars absolute energy distributions in the visual are available in the literature. The purpose of the present collection of …
IUE observations of the RS CVn systems Z Her, TY Pyx and HD 155555.
Fernandez-Figueroa, M. J.; de Castro, E.; Gimenez, A.
Short wavelength (λλ1150 - 1950 Å) low resolution ultraviolet spectra of three RS CVn regular-period binary systems, obtained with the IUE satellite, have been examined. Newly observed spectra were compared with those retrieved from the IUE data bank. The surface fluxes of chromospheric and transition region lines were obtained and are briefly dis…