Kinematic and abundance survey at the Galactic poles. III
A sample of 418 space velocities are examined, including 83 new values obtained for G5-K6 giants near the North Galactic Pole. A constant DDO-derived Fe/H abundance gradient of about -0.18 dex/kpc is found to extend to 8 kpc. The data show a continuous increase in the velocity dispersion as the distance above the Galactic plane increases and as the DDO-derived Fe/H abundance ratio decreases to -1.00. The data suggest a kinematic decoupling of the thick disk and halo stars. As in the case of the abundance gradient, the kinematic data are shown to be consistent with the concept of the galactic-model components. It is noted that giants with solar DDO-derived abundances are found only sparsely in the thick disk. 58 references.
- Research Organization:
- Illinois Univ., Urbana (USA); Dominion Astrophysical Observatory, Victoria (Canada); Kitt Peak National Observatory, Tucson, AZ (USA); Georgia State Univ., Atlanta (USA)
- OSTI ID:
- 5345043
- Journal Information:
- Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 94; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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