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Kinematics of Hipparcos Visual Binaries. II. Stars with Ground-Based Orbital Solutions
This paper continues kinematical investigations of the Hipparcos visualbinaries with known orbits. A sample, consisting of 804 binary systemswith orbital elements determined from ground-based observations, isselected. The mean relative error of their parallaxes is about 12% andthe mean relative error of proper motions is about 4%. However, even 41%of the sample stars lack radial velocity measurements. The computedGalactic velocity components and other kinematical parameters are usedto divide the stars with known radial velocities into kinematical agegroups. The majority (92%) of binaries from the sample are thin diskstars, 7.6% have thick disk kinematics and only two binaries have halokinematics. Among them, the long-period variable Mira Ceti has a verydiscordant {Hipparcos} and ground-based parallax values. From the wholesample, 60 stars are ascribed to the thick disk and halo population.There is an urgent need to increase the number of the identified halobinaries with known orbits and substantially improve the situation withradial velocity data for stars with known orbits.
| ICCD Speckle Observations of Binary Stars. XIII. Measurements During 1989- 1994 From the Cerro Tololo 4 M Telescope
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....111..936H&db_key=AST
| Orbits of 12 southern visual binaries
Orbital elements, magnitudes, spectral types, dynamical parallaxes,masses, ephemerides (1978.0 through 1994.0), normal places, andresiduals are presented for 12 southern visual binary systems. The pairsobserved include I27, Hast 1, phi 333, h 3555 (Alpha For), Don 91, Ru 65(Slr 7), Hd 275, B398, B405, See -, B1007, and Slr 14. It is noted thatHast 1 and Don 91 are red-dwarf pairs and that Ru 65 is the AB pair of amultiple system.
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Observation and Astrometry data
| Constellation: | Microscope |
| Right ascension: | 21h27m20.17s |
| Declination: | -32°17'49.1" |
| Apparent magnitude: | 9.057 |
| Proper motion RA: | 20.9 |
| Proper motion Dec: | -36.1 |
| B-T magnitude: | 9.362 |
| V-T magnitude: | 9.083 |
Catalogs and designations:
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