Uvby-beta photometry of high-velocity and metal-poor stars. IV - Distances, kinematics, and galactic orbits for stars with Fe/H equal to or less than -2.0

Details Uvby-beta photometry of high-velocity and metal-poor stars. IV - Distances, kinematics, and galactic orbits for stars with Fe/H equal to or less than -2.0 Uvby-beta photometry of high-velocity and metal-poor stars. IV - Distances, kinematics, and galactic orbits for stars with Fe/H equal to or less than -2.0

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..280a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 280-293. CONACYT-supported research.

Astronomy and Astrophysics

Astrophysics

42

Astronomical Photometry, Galactic Evolution, Halos, Orbit Calculation, Stellar Motions, Chemical Composition, Hydrogen, Iron

Scientific paper

From the catalog of high-velocity and metal-poor stars of Schuster and Nissen 43 stars with Fe/H equal to or less than -2.0 were selected as a sample representative of the oldest, most kinematically extreme component of the galaxy. For these stars, photometric distances were determined. Their galactic orbits were then numerically integrated in the galactic potential model of Allen and Martos (1986). Of the 40 stars with complete data, 27 are found to be in box-orbits, 2 in orbits verging on chaotic, 9 in chaotic, and 2 in tube-like orbits. Four stars attaining R(max) greater than 50 kpc and five stars with low eccentricities (e less than 0.4) are present in the sample. No obvious correlations of ages and/or metallicities with kinematical parameters were found. Two mechanisms for hiding chemical gradients in the halo are shown to be of importance.

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