Search Publications
The 1990 outburst of the recurrent nova V3890 Sgr observed with IUE.
Gonzalez-Riestra, R.
V3890 Sgr (Nova Sgr 1962) is one of the more recent examples of recurrent novae. Its second recorded outbursts took place in April 1990. IUE observations were obtained during the first month after the outburst. The UV spectra show the development of very broad emission lines with complex and variable profiles. Of particular interest is the "narrow…
The Ultraviolet Color Gradient in the Late-Type Spiral Galaxy M33
O'Connell, Robert W.; Bohlin, Ralph C.; Landsman, Wayne B. +3 more
The ultraviolet surface brightness and color distributions for the late-type spiral galaxy M33 are derived from images at 1520 and 2490 A that were obtained by the Ultraviolet Imaging telescope (UIT) on the Astro Spacelab mission. although the surface brightness shows a general decline with radius, the dominant spiral arms cause significant deviat…
The Luminosity of the Double-Mode Cepheid Y Carinae
Evans, Nancy R.
IUE spectra of the double-mode Cepheid Y Carinae have been used to determine the spectral type of the binary companion. From the companion spectral type (B9.O V), the absolute magnitude of the Cepheid is found to be -2.94 mag, with an estimated uncertainty of +/-0.3. This luminosity is in good agreement with that from the period-luminosity-color r…
Non-relativistic solar electron events during December 1990: Results from Ulysses
Chaizy, P.; Anderson, K. A.; Lin, R. P. +1 more
Several groups of impulsive flare accelerated non-relativistic solar electron events occurred in November and December 1990. In a total of 18 separate events, most show the characteristic dispersion in arrival times at the Ulysses spacecraft corresponding to travel time for the various particle energy groups. After maximum development, the electro…
HIPPARCOS double star recognition and processing within the FAST consortium
Badiali, M.; Cardini, D.; Emanuele, A. +4 more
The Hipparcos observations are potentially a source of discovery of new systems of double and multiple stars. Procedures have been developed to recognize in the signal parameters the multiplicity of the stellar objects. The principles applied to the recognition of double stars are presented in this paper along with statistical tests. Results based…
A two-wind radiation-driven model for the atmospheric features of beta Lyrae.
Pauldrach, A. W. A.; Puls, J.; Mazzali, P. A. +1 more
The properties of the non-degenerate interacting binary system of β Lyrae (B6.5 II p+BO V) are investigated via the analysis of its mass loss features.
As a first step, it is shown that the UV emission lines, observed in high dispersion by lUE, can be divided into two groups: one including the `superionised' hot-star wind resonance lines (N V…UV spectroscopy of the X-ray binary AC 211 (= 4U 2127+11) in M 15.
Raymond, J. C.; Charles, P. A.; Hassall, B. J. M. +2 more
Time-resolved International Ultraviolet Explorer observations are presented of the low-mass X-ray binary AC211/4U2127 + 11 in the globular cluster M15 (NGC 7078). The spectra show He II 1640-A emission, the flux of which is modulated on the 8.5-hr orbital period of AC211. This modulation and the ratio of He II 1640 A to He II 4686 A and C IV 1550 …
A Spectroscopic Search for Colliding Stellar Winds in O-Type Close Binary Systems. II. Plaskett's Star (HD 47129)
Wiggs, Michael S.; Gies, Douglas R.
New evidence for colliding winds in the massive O-type binary system Plaskett's star is reported. High S/N ratio spectra of the H-alpha and He I 6678 emission lines are presented, and their orbital phase-related variations are examined in order to derive the locations and motions of the high-density gas in the system. Radial velocity cures for sev…
Mesures de vitesses radiales. V. Accompagnement AU sol du programme d'observation du satellite Hipparcos.
Duflot, M.; Burnage, R.; Genty, V. +2 more
The paper presents data on 1070 radial velocity measurements of stars distributed in 39 fields measuring 4 deg x 4 deg. The PPO series of Fehrenbach et al. (1987) and Duflot et al. (1990) is continued using the Fehrenbach objective prism method.
Spectroscopic binary orbits from ultraviolet radial velocities. Paper 9: Y Cygni (HD 198846)
Stickland, D. J.; Lloyd, C.; Pachoulakis, I. +2 more
The paper presents spectroscopic binary orbits of Y Cygni obtained from the results of a three-day observations (covering 16 hours of each day) of this eclipsing binary, made by the IUE satellite at the end of May 1990. Full cross-correlation reduction of high-dispersion spectra secured over the three days allowed the production of an orbital solu…