Radial velocities andDDO, BV photometry of Henry Draper G5-M stars near the North Galactic Pole |
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| Authors: | K M Yoss R F Griffin |
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| Institution: | (1) Astronomy Department, University of Illinois, Urbana-Champaign, 61801 Urbana, Illinois, USA;(2) The Observatories, Madingley Road, CB3 OHA Cambridge, England |
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| Abstract: | Radial velocities are given for some 900 stars within 15‡ of the North Galactic Pole, including almost all such stars classified
G5 or later in theHenry Draper Catalogue. Luminosities, two-dimensional spectral classes, composition indices, and distances are derived for the majority of the sample
throughDDO andBV 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 componentsV andW, and a less well-defined trend forU. 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 l kpc of the Galactic plane, and no trends with
distance are evident. |
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| Keywords: | North Galactic Pole radial velocities BV andDDO photometry space velocities abundances Galactic structure |
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