Kinematics of Sandage-Fouts stars in three cardinal directions

Details Kinematics of Sandage-Fouts stars in three cardinal directions Kinematics of Sandage-Fouts stars in three cardinal directions

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..975y&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 975-993.

Astronomy and Astrophysics

Astronomy

12

Cygnus Constellation, Giant Stars, Radial Velocity, Stellar Composition, Stellar Motions, Interstellar Extinction, Star Formation, Stellar Color

Scientific paper

V and (B - V) for 429, 442, and 427 stars are observed in the directions of the anticenter, Cygnus, and the NGP, respectively, and DDO colors for those stars G0 and later. The samples observed are ones for which Sandage and Fouts (1987) have published radial velocities. W, V, and W components of space velocity are derived from DDO distances with available proper motions. A clear correlation was found to exist between the velocity dispersions and Fe/H with the dispersions decreasing as Fe/H increases to about + 0.00, where V then becomes significantly negative. The 'thick disk' component is clearly recognized, with sigma (W) approximately equal to 36 km/sec. In the 'old thin disk' and the 'young thin disk', 43 percent and 42 percent of the stars have negative V values, respectively.

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