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Distribution of MG II in the local interstellar medium towards eight cool giants.
Molaro, P.; Beckman, J. E.; Vladilo, G.
A study of IUE spectra of eight cool G4-K0 giants shows evidence of interstellar Mg II absorption in all the stars but Delta Dra. Sharp features are detected in the emission wings of four stars, while only strong asymmetries of the emission profiles are noted in three cases. In all the cases studied, the interstellar absorption features fall very …
Abundances in the planetary nebula NGC 6153.
Pottasch, S. R.; Mo, J.; Dennefeld, M.
Spectra in the visual, infrared and ultraviolet, of the planetary nebula NGC 6153 are presented. They are analysed to obtain the abundance and physical conditions in the nebula. It is found that NGC 6153 is a very unusual nebula, its abundance of many elements being higher than any other nebula.
Ultraviolet and visual variability of theta CrB during a normal B-phase following a shell phase (1980-1985).
Stalio, R.; Peters, G. J.; Doazan, V. +6 more
Based on far-UV and visual observations made between 1980 and 1985, the phenomena characterizing the end of a shell phase of Theta-CrB, and the normal B-phase following it, are described as part of a long-term study of Be stars. The strength, shape, and velocity of the C IV, Si IV, and Al III resonance lines, and the Fe III lines of low excitation…
A study of the upper atmosphere of Uranus using the IUE
Encrenaz, T.; Atreya, S. K.; Romani, P. N. +2 more
The 1750 Å band of C2H2 has been detected in an IUE spectrum of Uranus recorded in 1980. The derived C2H2 column density is 6.8±3.4×1016cm-2. Eddy diffusion coefficients of 104cm2s-1 or smaller at the homopause result in an abundance of photochemical…
Blue stragglers and the OBN phenomenon.
Schild, H.; Berthet, S.
Observational data for the hottest stars in five OB associations are reported to show that blue stragglers exhibit nitrogen overabundances. The coude spectra were taken in the ranges 3500-5400 A and 3800-4900 A at ESO and Observatoire de Haute Provence, respectively. The survey covered the objects HD 34656, HD 42088, HD 96715, HD 151804, HD 152233…
Luminosity and colour variations of 88 HER through phase changes fromthe far UV to the visual region. I. A confrontation with traditional Be-star modelling.
Doazan, V.; Barylak, M.
In this paper, hereafter called Paper I, we present and analyze the luminosity and colour variations of 88 Her in the wavelength range 1550 Å-55OO Å, during the period 1972-1983 where the star has exhibited two different phases: a quasi-normal B phase and a new Be-shell phase of increasing strength. The observations show that: (i) The star is most…
Trajectory Determinations and Collection of Micrometeoroids on the Space Station
Doyle, J. G.; Butler, C. J.; Byrne, P. B.
We report on a search for flaring and BY Draconis type variability on the M-dwarf Balmer emission line star, Gliese 867 B. The time-averaged flare energy in the Johnson U-band is similar to that measured in 1977 and 1978. A typical wave4ike variation of 0.15 magnitudes, seemingly due to rotational modulation of large spotted areas, was observed in…
Low-resolution IUE observations of four unreddened, 11th magnitude B stars at high galactic latitudes.
Tobin, W.
Low-resolution IUE spectra are presented for the four faint, unreddened, high-latitude, mid-B stars Feige 40 (≡FB 72), H.O. +23°B, H.O. +41°B (≡SS II 135) and PB 166. By comparison with stars in the Heck et al. atlas, the spectra are like those of normal disc stars of Population I metallicity. This suggests that the programme stars are massive, lu…
EXOSAT observations of GX 304-1 in an X-ray of state.
Pietsch, W.; Kahabka, P.; Gottwald, M. +2 more
Three EXOSAT observations of the Be/neutron star X-ray binary system GX 304-1 in July/August 1984 around the time of an expected periodic outburst occurring at 132.5 d intervals showed no detectable flux of X-rays. The derived upper limits of the flux in the low and medium energy range (0.03 - 2.4 keV and 2 - 6 keV) are both 3×10-12erg …
A study of UV spectra of zeta Aur/VV CEP stars. IX. Mass-loss and wind properties of the solar type supergiant 22 VUL (G3Ib-II).
Reimers, D.; Che-Bohnenstengel, A.
Phase-covering, high resolution IUE spectra of wind lines of the Zeta Aurigae type eclipsing binary 22 Vul (G3 Ib-Il + B9) have been analysed in terms of mass4oss and wind properties. We find a wind velocity of v∞ = 160 ± 20KM s-1 and a mass-loss rate of M = 6 1O-9 Msun yr-1 for the G supergiant primary.…