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Evolution of the velocity ellipsoids in the thin disk of the Galaxy and the radial migration of stars

Content Provider	Springer Nature Link
Author	Koval’, V. V. Marsakov, V. A. Borkova, T. V.
Copyright Year	2009
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. The velocity components of the Sun relative to the Local Standard of Rest derived using data for stars born at the solar Galactocentric distance are (U $_{⊙}$, V $_{⊙}$, W $_{⊙}$)$_{ LSR }$ = (5.1 ± 0.4, 7.9 ± 0.5, 7.7 ± 0.2) km/s. The two coordinates of the apex of the solar motion remain equal to 〈l $_{⊙}$〉 = 70° ± 7° and 〈b $_{⊙}$〉 = 41° ± 2°, within the errors. The indices for the power-law age dependences of them ajor, middle, and minor semi-axes become 0.26±0.04, 0.32±0.03, and 0.07±0.03, respectively. As a result, with age, the velocity ellipsoid for thin-disk stars born at the solar Galactocentric distance increases only in the plane of the disk, remaining virtually constant in the perpendicular direction. Its shape remains far from equilibrium, and the direction of the major axis does not change with age: the ellipsoid vertex deviation remains constant and equal to zero within the errors (〈L〉 = 0.7° ± 0.6°, 〈B〉 = 1.9° ± 1.1°). Such a small increase in the velocity dispersion perpendicular to the Galactic plane with age can probably be explained by “heating” of the stellar system purely by spiral density waves, without a contribution from giant molecular clouds.
Starting Page	1117
Ending Page	1126
Page Count	10
File Format	PDF
ISSN	10637729
Journal	Astronomy Reports
Volume Number	53
Issue Number	12
e-ISSN	15626881
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-12-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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

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The age-metallicity relation in the thin disk of the galaxy

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Modeling the spatial distribution of neutron stars in the Galaxy

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Evolution of the velocity ellipsoids in the thin disk of the Galaxy and the radial migration of stars

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