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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…