Investigation of the kinematics and structure of the Galaxy in the vicinity of the North Galactic Pole

Details Investigation of the kinematics and structure of the Galaxy in the vicinity of the North Galactic Pole Investigation of the kinematics and structure of the Galaxy in the vicinity of the North Galactic Pole

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994an....315..291k&link_type=abstract

Astronomische Nachrichten (ISSN 0004-6337), vol. 315, no. 4, p. 291-301

Astronomy and Astrophysics

Astronomy

21

Astrometry, Galactic Structure, Kinematics, Milky Way Galaxy, Stellar Magnitude, Distance, Galactic Rotation, Radial Velocity, Stellar Color

Scientific paper

In the framework of the program of studying the meridional section of the Galaxy (MEGA) the absolute proper motions of more than 11000 stars with respect to 3000 galaxies and their stellar magnitudes in the B, V Johnson system are determined in two sky regions near the North Galactic Pole (NGP) by means of Tautenburg Schmidt plates. The limiting and completing apparent stellar magnitudes are B = 20.4 and 18.3 mag, the overall and the investigated sky areas are 16.4 and 14.6 square degrees, respectively. Distances have been determined using the stellar magnitudes, colors, proper motions and reduced proper motions. Stellar kinematics, eccentricities of Galactic orbits, spatial distribution and changes of these characteristics with Z-distance from the Galactic plane are obtained up to 15 kpc. Four subsystems distinguished in the NGP direction, respectively with semi-thicknesses of 0.25, 0.38, 0.67, 1.48 kpc and density ellipsoid axial ratios of 0.09, 0.20, 0.28, 0.49 show mean velocities in the Galactic rotation direction relative to the LSR of 5.6 +/- 0.6, -11.0 +/- 0.6, -62.5 +/- 1.2, -181.6 +/- 4.4 km/s, and ages of 0.1, 0.4, 0.9, 1 of the Galaxy age.

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