Micrometric measures and orbits of southern visual double stars

Speckle Interferometry of Southern Double Stars. Ii. Measures from the Casleo 2.15 Meter Telescope, 1995è1996

Relative astrometry is presented for 198 observations of 160 double stars. The data were obtained at the 2.15 m telescope at the Complejo El Leoncito (Argentina) with a multianode microAstrono> mico channel array (MAMA) detector system. Five high-quality nondetections are also reported. When judged against ephemeris positions for binaries with very well determined orbits, the separation residua...

Measures with Separable Orbits

I-struve: Automatic linguistic descriptions of visual double stars

New technologies allow human beings to acquire huge amounts of information about their physical environment. Currently the challenge consists of automatically interpreting this information providing each specific user with descriptions remarking the relevant and hiding the irrelevant according to her/his

Lyrae stars : Kinematics , orbits and z - distribution

RR Lyrae stars in the Milky Way are good tracers to study the kinematic behaviour and spatial distribution of older stellar populations. A recently established well documented sample of 217 RR Lyr stars with V < 12.5 mag, for which accurate distances and radial velocities as well as proper motions from the Hipparcos and Tycho-2 catalogues are available, has been used to reinvestigate these stru...

Relative orientation of orbits in triple stars

Statistical analysis of the relative alignment of inner and outer orbits in triple systems resulting from a dynamical decay of small-N clusters (N ≤ 10) is presented and compared to the statistics of real multiple stars. The distribution of the relative angle Φ between the angular momentum vectors of inner and outer orbits in triple stars formed by decay is shown to depend on the initial cluste...