... 2007: . A Young Binary System Theta 1 Ori C. Based on the interferometer observations on BTA, for the first time we drew an orbit, calculated the masses, luminosity and spectral classes of the components of a very young (~ 100 thousand years old) massive (a total mass of 48 times the Sun) binary system Theta 1 Ori C in the nearest to us Orion complex of star formation. Archive . ...

... Two such triple stars with low mass components, GJ 900 and KUI 99, have been observed during the last six years at the 6 m BTA telescope (Zelenchuk). ... Fig. ... The relative positions of the AB pair changed linearly during the period 2000­2004, showing a mean value of 48 mas/yr (Fig. ... Orbital solutions for the outer pair were proposed by Baize [1], Heintz [4] and Soderhjelm [10]. ... The apparent ellipses of the KUI 99 AC and KUI 99 AB pair are shown in Fig. ... P. Baize: Astron. Astrophys. ...