Evolution of the Velocity Ellipsoids in the Thin Disk of the Galaxy and the Radial Migration of Stars

Abstract

Data from the revised Geneva--Copenhagen catalog are used to study the influence of radial migration of stars on the age dependences of parameters of the velocity ellipsoids for nearby stars in the thin disk of the Galaxy, assuming that the mean radii of the stellar orbits remain constant. It is demonstrated that precisely the radial migration of stars, together with the negative metallicity gradient in the thin disk,are responsible for the observed negative correlation between the metallicities and angular momenta of nearby stars, while the angular momenta of stars that were born at the same Galactocentric distances do not depend on either age or metallicity. (abridged)

Astronomy Reports, Vol. 86 No. 9, P.1117-1126 (2009)

References in corpus (6)

• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• The Geneva-Copenhagen Survey of the Solar neighbourhood II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk
• Radial mixing and the transition between the thick and thin Galactic discs
• The stellar velocity distribution in the solar neighbourhood
• Heating of Galactic Disks by Infalling Satellites
• Relationship between the Velocity Ellipsoids of Galactic-Disk Stars and their Ages and Metallicities

Cited by in corpus (5)

• A method to estimate stellar ages from kinematical data
• A kinematical age for the interstellar object 1I/'Oumuamua
• The local standard of rest from data on young objects with account for the Galactic spiral density wave
• Confronting compositional confusion through the characterisation of the sub-Neptune orbiting HD 77946
• Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903