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Stellar Wind Variability from IUE Spectra of Epsilon Orionis

Sapar, L.; Sapar, A.

21 IUE spectra of epsilon Ori (HD 37128), B0 supergiant, were studied to analyze variations in the profiles of the resonance lines of N V, C IV, Si IV and Si III. The largest variations in the profiles of resonance doublets of N V, C IV and Si IV are found in blue wings of the lines at velocities from --1500 to --2000 km/s, reaching in some spectr…

Mass Loss During Proto-Planetary Phase of Evolution The Case of HD 101584 = IRAS 11385-5517

Szczerba, Ryszard; Gesicki, Krzysztof

ISO Spectra of Symbiotic Stars

Vogel, M.; Schild, H.

ISOPHOT Mapping Observations of Carbon Stars

Izumiura, H.; Hashimoto, O.

Mapping observations have been made toward five carbon stars in the far-infrared using ISOPHOT, an imaging photo-polarimeter on board the Infrared Space Observatory. Cold, very extended dust shells are clearly revealed in two of them. Y CVn is surrounded by a very extended, detached dust shell, which indicates a sudden decline of the mass-loss by …

The energy distribution of Beta CrB for the specific stellar abundances

Castelli, F.

The comparison of the observed and computed energy distributions of Beta CrB has shown that a model with the specific chemical composition of the star can account for the visual energy distribution, while it is still unable to reproduce ultraviolet observations shortward of 1700 Angstroms. Furthermore, the predicted absorption of strong Fe II and …

Theory of AGB Evolution

Blöcker, Thomas

ASOCAM Observations of CYG X-3: Search for a Hot Stellar Wind

Fender, R. P.; Ogley, R. N.; Burnell, S. J. Bell

Six CAM observations have been made in the 4 - 14 µm wavelength region to search for further evidence of emission from a hot stellar wind. Initial results suggest that the spectrum detected by Fender et al. using UKIRT extends into the wavelength region covered by ISOCAM. There is also evidence that the source is variable on timescales of ≈ 70 sec…

Sumer/soho

Dwivedi, B. N.

Calibration of the Debris Project ISOPHOT Data

Silverstone, Murray; Becklin, E. E.; Spangler, Celeste

On the evolutionary status of lambda Bbootis stars using HIPPARCOS data

Paunzen, E.

Using the Hipparcos data, absolute magnitudes and thus the evolutionary status for the group of lambda Bootis stars were derived. The origin of this small group of non-magnetic, chemically peculiar stars, still remains a matter of debate. Using new evolutionary tracks, an age determination could be provided to distinguish between the two competing…