|
We find that massive stars in Per OB1 move away from the galactic plane. Although the
proper motions of the members move same direction, the members of Per OB1 do not share
common proper motions. Stars located at large galactic height move faster away from
galactic plane as other OB associations. At large galactic height (> 280 pc), we
discover four ongoing star-forming regions which are located on a border of a
superbubble. These phenomena can be explain by star formation triggered by a
superbubble. The superbubble created by active star formation in Per OB1 would push and
accelerate molecular cloud away from the galactic plane. At the same time, the
superbubble also triggers next generation of star formation. For molecular material
accelerated by the superbubble, the stars formed within this material would naturally
exhibit higher velocities away from the galactic plane than first generation stars. The
young stars associated with the ongoing star-forming regions are the youngest members of
Per OB1. This work may help us to understand the formation of massive stars in an OB
association.
|