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HD 40705


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New spectroscopic binaries among nearby stars
In the course of surveying a large number of nearby (~50 pc or less)stars for indicators of youth, we have discovered a number of hithertounknown spectroscopic binaries. Here we present a list of these newbinaries with pertinent data. Two of these (HD 143705 and HD 89959) havebeen observed six times each, and their respective radial velocitycurves are discussed.Based on observations collected at the European Southern Observatory,Chile (ESO No. 62.I-0650, 66.D-0159(A), 67.D-0236(A)).

Kinematics of Hipparcos Visual Binaries. I. Stars with Orbital Solutions
A sample consisting of 570 binary systems is compiled from severalsources of visual binary stars with well-known orbital elements.High-precision trigonometric parallaxes (mean relative error about 5%)and proper motions (mean relative error about 3%) are extracted from theHipparcos Catalogue or from the reprocessed Hipparcos data. However, 13%of the sample stars lack radial velocity measurements. Computed galacticvelocity components and other kinematic parameters are used to dividethe sample stars into kinematic age groups. The majority (89%) of thesample stars, with known radial velocities, are the thin disk stars,9.5% binaries have thick disk kinematics and only 1.4% are halo stars.85% of thin disk binaries are young or medium age stars and almost 15%are old thin disk stars. There is an urgent need to increase the numberof the identified halo binary stars with known orbits and substantiallyimprove the situation with their radial velocity data.

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Observation and Astrometry data

Constellation:Columba
Right ascension:05h58m56.50s
Declination:-34°21'33.4"
Apparent magnitude:8.168
Distance:60.314 parsecs
Proper motion RA:-23
Proper motion Dec:4.5
B-T magnitude:8.949
V-T magnitude:8.233

Catalogs and designations:
Proper Names
HD 1989HD 40705
TYCHO-2 2000TYC 7066-511-1
USNO-A2.0USNO-A2 0525-02523886
HIPHIP 28311

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