Vertical structure of the galactic disk in the solar neighborhood

Details Vertical structure of the galactic disk in the solar neighborhood Vertical structure of the galactic disk in the solar neighborhood

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..630m&link_type=abstract

Astronomicheskij Zhurnal, vol. 72, p. 630

Astronomy and Astrophysics

Astronomy

1

Galactic Structure, Solar Neighborhood, F Stars, Stellar Structure, Vertical Distribution, Stellar Orbits, Stellar Mass, Intergalactic Media, Metallicity

Scientific paper

The vertical structure of star subsystems of various ages and metallicities is studied on the basis of a complete sample of F-stars within 50 pc from the sun. It was found that the sun lies -9 +/- 2 pc above the plane of the Galactic disk in the direction of the North Galactic pole and that F0-F9 stars contribute 0.0035 solar mass/cu pc to the density of the Galactic disk. We also developed a method of statistical reconstruction of the actual height distribution of various objects at the Solar circle, based on calculation of three-dimensional orbits of stars. We used this method to determine the scale height of the subsystem of F stars of the Galactic disk, Z0=160 +/- 10 pc. It was shown that, in the process of its evolution, the disk subsystem as a whole flattens, however, at each instant of time the metal-rich stars concentrate much stronger toward the Galactic plane than the metal-poor stars. It is suggested that the scale height of the metal-poor star subsystem is due to the infall of the metal-poor intergalactic gas onto the disk.

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