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Astron. Astrophys. 363, 154-158 (2000)


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On the rotation of Gould's Belt

P.O. Lindblad

Stockholm Observatory, 133 36 Saltsjöbaden, Sweden (po@astro.su.se)

Received 20 June 2000 / Accepted 20 September 2000

Abstract

Among the characteristics that define the local system of stars called Gould's Belt are the flatness of the system, its inclination of about 20o to the galactic plane, and its expansion. This has to be conciled with its age being estimated at 30-40 Myr. The model, introduced here to explain the persistence of the tilt of the system to the galactic plane, is an inclined rotating and expanding disk. The model is developed in the linear approximation, and the parameters of the model are derived from the observations. The result gives a reasonable set of parameters. It is pointed out, however, that a final picture must be based on realistic non-linear simulations adding self-gravitation and successive birth of stars in an interstellar cloud, expanding due to actions of young stars and supernovae.

Key words: stars: early-type – stars: formation – Galaxy: kinematics and dynamics


© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000

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