Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.276..359p&link_type=abstract
Astrophysics and Space Science, v. 276, Issue 2/4, p. 359-365 (2001).
Astronomy and Astrophysics
Astrophysics
Scientific paper
The motion of OB stars closer than 2 kpc from the Sun is analysed. It shows that the local system of young stars lags behind the LSR by 4-5 km s^-1, and that its motion may be explained as local nearly rigid-body rotation in the same direction as the overall galactocentric rotation. The residual velocities reveal local expansions in the Scorpius-Centaurus and Orion regions and a motion of these two regions away from each other. The computed orbits show that 10-12 Myr ago the progenitors of Scorpius-Centaurus OB associations were concentrated within a minimum volume. They were also closer to the progenitors of the OB association in Orion, residing all together within a sheet-like region elongated in the l = 20-200° direction. Free expansion, supershells related to OB associations and a supershell related to a hypernova event have been examined as possible models. No agreement with observation has been reached yet; more variants should be tested in the future.
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