Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997japa...18..161y&link_type=abstract
Journal of Astrophysics and Astronomy, Vol. 18, p.161
Astronomy and Astrophysics
Astrophysics
11
North Galactic Pole, Radial Velocities, Bv And Ddo Photometry, Space Velocities, Abundances, Galactic Structure
Scientific paper
Radial velocities are given for some 900 stars within 15 degree of the North Galactic Pole, including almost all such stars classified G5 or later in the Henry Draper Catalogue. Luminosities, two-dimensional spectral classes, composition indices, and distances are derived for the majority of the sample through DDO and BV photometry. More than half of the stars are classified as G5-K5 giants: they show a clear relationship between composition and velocity dispersion for the two Galactic components V and W, and a less well-defined trend for U. Four abundance groups exhibit characteristics which imply association with, respectively, the thick disk, old thin disk, young thin disk, and Roman's "4150" group. The sample is contained within 1kpc of the Galactic plane, and no trends with distance are evident.
Griffin Roger F.
Yoss Kenneth M.
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