Kinematics of T Tauri Stars Close to the Sun from the Gaia DR2 Catalogue

Abstract

The spatial and kinematic properties of a large sample of young T Tauri stars from the solar neighborhood 500 pc in radius have been studied. The following parameters of the position ellipsoid have been determined from the most probable members of the Gould Belt: its sizes are $350\times 270\times 87$~pc and it is oriented at an angle of $14\pm 1^{\circ }$ to the Galactic plane with a longitude of the ascending node of $297\pm 1^{\circ }$. An analysis of the motions of stars from this sample has shown that the residual velocity ellipsoid with principal semiaxes ${\sigma }_{1,2,3}=(8.87,5.58,3.03)\pm (0.10,0.20,0.04)$~km s${}^{-1}$ is oriented at an angle of $22\pm 1^{\circ }$ to the Galactic plane with a longitude of the ascending node of $298\pm 2^{\circ }$. It has been established that much of the expansion effect (kinematic $K$ effect) typical for Gould Belt stars, 5--6 km s${}^{-1}$ kpc${}^{-1}$, can be explained by the influence of a Galactic spiral density wave with a radial perturbation amplitude $f_R\sim 5$ km s${}^{-1}$.

17 pages, 4 figures, 3 tables

References in corpus (8)

• The Gould Belt, the de Vaucouleurs-Dolidze Belt, and the Orion Arm
• Kinematics of the Gould Belt Based on Open Clusters
• Kinematics of the Scorpius-Centaurus OB Association
• Kinematic Properties of Open Star Clusters with Data from the Gaia DR2 Catalogue
• On the Properties of the Galactic Dust Layer within 700 pc of the Sun
• The System of Molecular Clouds in the Gould Belt
• Vertical Distribution and Kinematics of Protoplanetary Nebulae in the Galaxy
• Features of the Residual Velocity Ellipsoid of Hot Subdwarfs from the Gaia DR2 Catalog

Cited by in corpus (5)

• Galactic Rotation Parameters Based on Stars from Activ Star-Forming Regions with Data from the Gaia DR2 Catalogue
• The Science of Fundamental Catalogs
• Estimation of the Gould Belt scale height from T Tauri type stars in the Gaia DR2 catalogue
• Kinematic Properties of Young Intermediate- and Low-Mass Stars from the Gaia DR2 Catalogue
• Place of the Radcliffe Wave in the Local System