Binary and multiple stellar systems from data analysis of the space observatory GAIA


Dear colleagues,

we would like to invite you to the seminar of Division of Elementary Particle Physics of Institute of Physics, presented by Dr. Petr Závada.

For more info, please see invitation.



The occurrence of multiple stars, dominantly binaries, is studied using the Gaia-ESA catalog. We apply the statistical method that we have developed for the analysis of 2D patterns.  The criteria for selecting multiple-star candidates are based on two parameters: angular separation and collinearity of proper motion. Radial separation is only used as a weaker additional constraint due to its limited accuracy.  Due attention is paid to the accurate calculation of the background, which is a necessary input for evaluating the quality of the candidates. Our selection algorithm generates the catalog of candidates: 900 842 binaries, 5282 trinaries, and 30 quaternaries.