Intermediate-band photometry of late-type stars VIII. Nonvariable stars in the halo population near the sun.

From a discussion of a complete sample of high-velocity stars, the following criteria are suggested for identification of halo population objects: (1) all stars having less than about 25% of the solar metal abundance; (2) if only the space motion is available, those giving e > 0.42; (3) for e < 0.42, Wj larger than about 60 km s-l (or Z greater than about 1 kpc). The available data for the halo stars indicate that the whole range of halo metal abundance is present in the region of 10 to 20 kpc from the galactic center, but this range narrows beyond 20 kpc, and the upper limit, beyond 30 kpc, is near 3% of the solar abundance. Subject headings: stars: abundances - stars: high-velocity - stars: late-type - stars: stellar dynamics