Search Publications
An Astrometric Catalogue of Radio Stars
Walter, H. G.; Hering, R.; de Vegt, Ch.
The first part is presented of a radio star catalog encompassing 186 objects whose selection was guided by the priority criteria of the Hipparchos Input Catalogue Consortium. Since these criteria are well suited to the need for linkage of ground-based optical systems to radio reference frames, this first selection is also considered a suitable bas…
A computed spectrum for the normal star ι Herculis (B3 IV) in the region 122.8 - 195.0 nm.
Bonifacio, P.; Castelli, F.
The authors have compared Copernicus and IUE high resolution spectra of the sharp-lined normal star ι Her with an LTE synthetic spectrum computed by using a blanketed Kurucz's (1979) model with parameters Teff = 17180K, log g = 3.43, and the new line lists of Kurucz (1988). A microturbulence ξ = 0 km s-1 gives the best agreem…
CCD astrometry of visual binaries. II. Differential measurements of northern double stars.
Sinachopoulos, D.; Seggewiss, W.
Separations and position angles of 148 visual multiple systems were measured by means of a CCD detector attached to the Calar Alto 1.23-m telescope. The program stars are candidates for the Hipparcos Input Catalog.
The EXOSAT low energy imaging telescopes and transmission grating spectrometers, calibration and in-flight verification.
Brinkman, A. C.; Paerels, F. B. S.; de Korte, P. A. J. +2 more
The calibrations of the Low Energy Imaging Telescope and Transmission Grating Spectrometers on the European X-ray Observatory Satellite Exosat are presented. The final calibration is based primarily on calibration data obtained in the laboratory; verifications and checks of these calibrations with the aid of suitable astrophysical data obtained wi…
Mesures de vitesses radiales. IV. Accompagnement AU sol du programme d'observation du satellite Hipparcos.
Duflot, M.; Genty, V.; Mannone, C. +1 more
The paper presents 396 radial velocities of stars distributed in 19 fields of 4 x 4 degrees. The study employs the Fehrenbach objective prism method and the same measuring technique used in a previous paper (Fehrenbach et al., 1987).
Mesures de vitesses radiales. III. Accompagnement AU sol du programmed'observation du satellite Hipparcos. Mesure de la vitesse radiale de391 etoiles dans 12 champs.
Burnage, R.; Fehrenbach, Ch.
The radial velocities of 391 stars, obtained with the Fehrenbach objective prism associated to the Schmidt telescope of the Observatoire de Haute-Provence are presented. These stars belong to fields specially chosen for containing several Hipparcos input catalog star members. Each field is presented independently. The list includes HD and BD ident…
UBVRI photometry of G, K, M HIPPARCOS stars.
Jordi, C.; Figueras, F.; Torra, J. +1 more
UBVRI data are presented for a set of 229 late-type stars, most of them being high proper motion stars. All these data are part of the Input Catalog planned observations for the Hipparcos mission.
Ephemerides of the 48 HIPPARCOS minor planets for the year 1991
Bec-Borsenberger, A.
To be observed by Hipparcos, the position of each object has to be known with an accuracy of 1 arcsecond and its magnitude with an accuracy of 0.5 mag. Therefore, the orbital elements of 48 selected minor planets of the Hipparcos mission, have been improved in order to extrapolate their ephemerides with the accuracy required. These ephemerides for…
Optical positions of radiostars. II.
Costa, E.; Loyola, P.
Precise optical positions, relative to either the Perth 70 or the AGK3R catalogs, have been obtained for 40 radiostars proposed to the Hipparcos observing list. Precision levels between 0.18 and 0.29 arcsecs were obtained.
UVBY photometry of HIPPARCOS stars.
Oblak, E.
Photoelectric data in the uvby system have been obtained for 367 southern stars of the Hipparcos Input Catalogue. Most of the stars are F and G main sequence and fall in the magnitude range V = 9 to 10.