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The separation of red horizontal branch giants from reduced proper motions

Rybka, S. P.

The possibility to use reduced proper motions for distinguishing red horizontal branch giants from foreground stars is substantiated. Our approach is developed on the basis of HIPPARCOS astrometric data and near-infrared 2MASS photometric data taken from the UCAC2 BSS catalogue. The application of maximum-likelihood technique to analyse the distri…

Graphical method for estimation of accuracy of astrometric catalogues

Nefedjev, Yu. A.; Rizvanov, N. G.; Rakhimov, L. I. +1 more

We propose a new method for the estimation of the accuracy of star positions and proper motions in astrometric catalogues based on the comparison of the star positions in catalogue a under investigation and the HIPPARCOS catalogue in various epochs but for a standard equinox. In this case the comparison results are represented as a curve. On the a…