Other
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..479c&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 479-484
Other
Scientific paper
We report the detection of expanding patterns, revealed by Hipparcos proper motions, in some OB associations. The expansion velocities exceed typical internal motions in associations, and suggest that very energetic processes may have been responsible for both the formation of the stars and their initial velocities. Observations of related interstellar gas support this explanation. One of the regions is located near the Cygnus Superbubble, a large X-ray emitting cavity centered on the Cygnus OB2 association. Stars in this region seem to be expanding away from the center of the Superbubble, and the Hipparcos data allow to trace the expanding pattern all over the area of the Superbubble. The other expanding pattern is in Canis Major, with the stars of Canis Major OB1 mostly lying between the center of expansion and the Canis Major R1 association, where star formation is taking place at present. We propose that the OB stars in Cygnus formed as a consequence of gravitational instabilities in a dense shell surrounding the Cygnus Superbubble, which in turn is a byproduct of the activity of the massive stars of Cygnus OB2. For Canis Major OB1, star formation may have been triggered by a supernova explosion near a dense molecular cloud. This is supported by the existence of a new runaway star, HIP 35707, moving away from the center of expansion, which may have been the binary companion of the supernova progenitor, released after the explosion.
Comeron Fernando
Gomez Ana E.
Jordi Carme
Torra Jordi
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