Search Publications
A new maximum likelihood method for luminosity calibrations.
Luri, X.; Figueras, F.; Torra, J. +1 more
A new statistical parallax method using the Maximum Likelihood principle is presented, allowing the simultaneous determination of a luminosity calibration, kinematic characteristics and spatial distribution of a given sample. This method has been developed for the exploitation of the Hipparcos data and presents several improvements with respect to…
Radial velocities and axial rotation for a sample of chemically peculiar stars.
Morrell, N.; Levato, H.; Grosso, M. +2 more
As part of a systematic project we have determined radial velocities and projected rotational velocities for a sample of 186 chemically peculiar stars which have been observed by the Hipparcos' satellite. The purpose is to provide necessary data to study the space velocities of peculiar stars.
UvbyHbeta_ photometry of main sequence A type stars.
Jordi, C.; Figueras, F.; Torra, J. +1 more
We present Stroemgren uvby and Hbeta_ photometry for a set of 575 northern main sequence A type stars, most of them belonging to the Hipparcos Input Catalogue, with V from 5mag to 10mag and with known radial velocities. These observations enlarge the catalogue we began to compile some years ago to more than 1500 stars. Our catalogue inc…
Mesures et decouvertes d'etoiles doubles effectuees a la lunette de 50cm de l'Observatoire de Nice. Measures and discoveries of visual double stars made with the 50cm refractor at the Nice Observatory.
Thorel, J. -C.
Measures and discoveries of visual double stars made at the Observatoire de la Cote d'Azur at Nice, between 1988 and 1994, with the 50cm refractor equipped with a filar micrometer and electronic recording device. The programs proposed by J. Dommanget involve the complement of the C.C.D.M. (resolving problems of identification of double stars and o…
Global astrometry with OSI.
Malbet, F.; Loiseau, S.
The Orbiting Stellar Interferometer is a proposed space-based interferometer which makes very accurate wide-angle astrometric measurements on several thousand stars. As opposed to Hipparcos, OSI does not have a "basic angle" between two separate field-of-views but three separate interferometers and a highly accurate metrology system. The questions…
Optical positions of radio emitting stars.
Assafin, M.; Andrei, A. H.; Puliaev, S. P. +4 more
In order to contribute to the alignment of the radio and optical reference frames, 50 stars with confirmed radio emission and published radio positions were observed by astrographical means. Additionally, two confirmed radio-stars of fainter magnitude were observed using a CCD direct camera with a long focus, large aperture telescope. The reductio…
Stars of the southern hemisphere proposed for the HIPPARCOS mission.
Rousseau, J. M.; Perie, J. P.; Gachard, M. T.
As part of the preparation for the Hipparcos mission, we determined the positions of 96800 already listed stars and 21265 previously unlisted companions, using information gathered by the ESO Quick Blue Survey. B1950 and J2000 system coordinates are given for each star. The magnitudes and spectral types are given in addition to the exact date of t…
First catalogue of stars with the photoelectric astrolabe in San Juan.
Wang, Z.; Zhao, G.; Lu, L. +9 more
On the basis of data observed in San Juan of Argentina with the photoelectric astrolabe mark II (PA II) of Beijing Astronomical Observatory from 23 Feb., 1992 to 28 Feb., 1995, residuals of 7200 stars are reduced from about 230000 observations of stars. The mean precision of the residuals is +/-0.046". Using the data, the first catalogue of stars …
Astrometric positions of stars associated with nebulosities in the southern hemisphere.
Rousseau, J. M.; Perie, J. P.
Several stars associated with nebulosities and cited by S. van den Bergh and W. Herbst are included in the preliminary programme for the HIPPARCOS mission. When performing preparatory measurements of plates, we encountered difficulties in identifying certain of these objects when relying only on coordinates, which led us to take advantage of this …