Gould Belt Kinematics on the Base of the Open Clusters and Ob-Associations

Details Gould Belt Kinematics on the Base of the Open Clusters and Ob-Associations Gould Belt Kinematics on the Base of the Open Clusters and Ob-Associations

2006-08-12

arxiv.org/abs/astro-ph/0608265v1

Astronomical and Astrophysical Transactions, Vol. 25, No. 2, 2006

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures

Scientific paper

10.1080/10556790600893088

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 -4 km s$^{-1}$ for rotation (in the direction of the Galactic rotation) and $+4$ km s$^{-1}$ for expansion, when the distance from the kinematic centre is about 300 pc. We assumed the following parameters of the Gould Belt centre: $l_\circ=128^\circ$ and $R_\circ=150$ pc. It is shown that the whole structure of the Gould Belt is moving relative to the local standard of rest with a velocity of $10.7\pm0.7$ km s$^{-1}$ in the direction towards $l=274\pm4^\circ$, $b=-1\pm3^\circ$. Using the rotation velocity, we obtained the virial estimation of the Gould Belt mass as $1.5\times 10^6 M_\odot$.

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