Search Publications
UBVRI photometry of G, K, M HIPPARCOS stars. II.
Jordi, C.; Figueras, F.; Torra, J. +2 more
As indicated by Grenon (1989), the data of the present series of reports on the UBVRI photometry of late-type stars in the Hipparcos Input Catalog are to be employed in computations of Hipparcos observing time, as well as in evaluating the observability of faint stars by the satellite. Attention is here given to late type stars in the V = 8-12 ran…
A line identification study of the IUE SWP high dispersion spectrum of the UV-bright star Barnard 29 of Messier 13.
Leckrone, D. S.; Cacciari, C.; Adelman, S. J.
A line identification study was performed of the coaddition of three SWP high dispersion IUE exposures of the UV-bright star Barnard 29 of Messier 13. One of these images took two IUE shifts. The previous study by de Boer and Savage (1983) was extended and stellar lines of C I, C II, C III, C IV, N I, N III, O I, O III, O IV,Al III, Si II, Si III,…
Optical positions of radiostars. III.
Costa, E.; Loyola, P.
Precise optical positions, relative to either the Perth 70 or the AGK3R catalog have been obtained for 44 radiostars proposed to the Hipparcos observing list. Precision levels between 0.17 and 0.28 arcsec were obtained.
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.