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A test of Hipparcos parallaxes on multiple stars

Tokovinin, A. A.; Shatskii, N. I.

The dynamical parallaxes of visual binary stars with reliable orbits selected from the multiple star catalog are compared with their Hipparcos trigonometric parallaxes. 141 objects with errors in the Hipparcos parallaxes no larger than 2.5 mas are divided into three groups by the quality of their orbits and by the reliability of the Hipparcos comp…

Kinematic evidence for the wave nature of the Carina-Sagittarius arm

Dambis, A. K.; Rastorguev, A. S.; Sitnik, T. G. +2 more

Radial-velocity and (Hipparcos) proper-motion data are used to construct the residual space velocity field for OB associations in the Carina-Sagittarius arm. The azimuthal residual velocity component for most stars in the Sgr OB1, Ser OB1, Cru OB1, Cen OB1, and Car OB2 associations has the direction that is opposite to the Galactic rotation, while…

The nature of visual components in 82 multiple systems

Shatskii, N. I.

We performed photoelectric BVR observations of 198 visual components in 82 multiple systems. We used a special technique for the measurements with a classical photometer. In our study of close visual binaries, we employed a new instrument - an astrometric scanning photometer; its design is described. Based on our photometric data in combination wi…