Evolution of Orbital Elements: Case of Xi Ursae Majoris

S. Ninkovic, R. Pavlovic, Z. Cvetkovic and D. Olevic

Astronomical Observatory, Belgrade, Volgina 7, 11160 Beograd 74, Serbia and Montenegro

email: sninkovic@aob.bg.ac.yu

We discuss the long-term behaviour of the triple system Xi Ursae Majoris (ADS 8119 = WDS 11182+3132 = HIP 55203). The initial conditions are the estimated masses of the components based on calculated orbital elements (Mason 1995) and the trigonometric parallaxes taken from the Hipparcos Catalogue.