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Gould Belt kinematics on the basis of the open clusters and OB associations

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The kinematic parameters of the Gould Belt are redetermined using modern data on the motion of nearby young (log t<7.91) open clusters, OB associations and moving stellar groups. The modelling carried out shows that the residual velocities achieve the maximal values equal to–4ÂkmÂs–1 for rotation (in the direction of the Galactic rotation) and+4ÂkmÂs–1 for expansion, when the distance from the kinematic centre is about 300Âpc. We assumed the following parameters of the Gould Belt centre: l0=128° and R0=150Âpc. It is shown that the whole structure of the Gould Belt is moving relative to the local standard of rest with a velocity of 10.7±0.7ÂkmÂs–1 in the direction towards l=274±4°, b=–1±3°. Using the rotation velocity, we obtained the virial estimation of the Gould Belt mass as 1.5x106M⊙.

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Keywords: Gould Belt; Kinematics; Structure

Document Type: Research Article

Affiliations: Main (Pulkovo) Astronomical Observatory of the Russian Academy of Sciences, Pulkovskoye Chaussee 65/1, St Petersburg, 196140, Russia

Publication date: 2006-04-01

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