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Kinematics of Hipparcos Visual Binaries. II. Stars with Ground-Based Orbital Solutions

Bartkevičius, A.; Gudas, A.

This paper continues kinematical investigations of the Hipparcos visual binaries with known orbits. A sample, consisting of 804 binary systems with orbital elements determined from ground-based observations, is selected. The mean relative error of their parallaxes is about 12% and the mean relative error of proper motions is about 4%. However, eve…

Interstellar Extinction Along the Camelopardalis and Perseus Border

Zdanavičius, J.; Zdanavičius, K.

Interstellar extinction in a ~ 100 sq. degree area at the Camelopardalis and Perseus border is investigated. The study is based on the results of photoelectric photometry of 455 stars in the seven-color Vilnius photometric system published earlier. The nearest 100 stars with Hipparcos parallaxes show that the extinction starts to grow at a distanc…