Search Publications
The Far Ultraviolet Spectrum of the O4I/N/F Star Zeta-Puppis
Danezis, E.; Laskarides, P. G.; Theodossiou, E.
A detailed list of line identifications of the far UV spectrum of the O4I(n)f star ζ Puppis (HD 66811) in the wavelength range λλ1168–1984 Å recorded on 16 April, 1981 with the International Ultraviolet Explorer (IUE) is presented. The detailed analysis of the radial velocities measured in the same wavelength range is also presented.
Astrometry of Southern Radio Sources
Preston, Robert A.; White, Graeme L.; Gulkis, Samuel +7 more
An overview is presented of a number of astrometry and astrophysics programs based on radio sources from the Parkes 2.7 GHz catalogues. The programs cover the optical identification and spectroscopy of flat-spectrum Parkes sources and the determination of their milliarc-second radio structures and positions. Work is also in progress to tie togethe…
An Observational Program for a Unified Optical / Radio Reference Frame
White, G.; de Vegt, C.; Johnston, K. J. +4 more
An observational pilot program is described which provides a first step towards the construction of an inertial extragalactic reference frame from optical and radio measurements. Candidate objects will be selected from extragalactic compact radio sources which display optical counterparts. Galactic radio stars will be secondary reference objects. …
A Cool Giant with a Circumstellar Cloud
Kondo, Y.; Gurzadian, G. A.; Perez, Mario R. +2 more
The IUE spectrum of the star HD 139521, a giant of class G8III is obtained and based on the analysis of the narrow structure of 2795 (k) and 2803 (h) MgII emission profiles, the existence of a circumstellar cloud around the giant star is assumed. This conclusion is confirmed also by the anomaly of the small observed power of the doublet MgII emiss…
The HIPPARCOS Input Catalogue - a Progress Report from an Astrometric Point of View
Turon, C.; Requieme, Y.
The construction of the Hipparcos satellite is proceeding according to the schedule and should be finished in March 1988. But, due to some problems with the Ariane European booster, the launch has now been postponed until 1989. In practice, this means that the astronomical community may expect delivery of the final Hipparcos Catalog only in 1995. …
Le nouvel astrolabe de l'Observatoire de Paris
Chollet, F.
The new polyvalent astrolabe of the Paris Observatory is described. After some optical modifications this new instrument is able to observe the stars, some planets, and the sun with an internal error less than 0.4 arcsec in the last case. Some new modifications are in progress to obtain better results and stability in the solar observations. This …
Residuals for the Observations of the 62 Selected Minor Planets
Calaf, J.
This paper reports results of the improvement of orbital elements of the 62 minor planets included in the Hipparcos mission. The astrometric observations supplied by the Minor Planet Center and the meridian circles at La Palma and Bordeaux observatories were used by the author. The accuracy reached (RMS O-C) for each minor planet and for La Palma …