On the expansion of stellar association Per OB2
Mirzoyan, L. V.; Hambaryan, V. V.; Akopian, A. A.; Poghosyan, A. V.; Salukvadze, G. N.
Armenia, United States
Abstract
The analysis of the proper motions of bright members of the Per OB2 association on the basis of Hipparcos high-accuracy astromethc observations is presented. The existence of two different subgroups of OB-stars in the Per OB2 association that are in the state of expansion is considered. The expansion ages are calculated as 1.3 and 1.9×106 years. The membership of the observed OB-stars to these subgroups is considered.