Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..113g&link_type=abstract
Astronomy and Astrophysics, vol. 54, no. 1, Jan. 1977, p. 113-119. Research supported by the Observatoire de Paris.
Astronomy and Astrophysics
Astrophysics
7
Density Wave Model, G Stars, Galactic Rotation, Galactic Structure, Giant Stars, Spiral Galaxies, Stellar Motions, Abundance, Astrodynamics, Astronomical Models, Body Kinematics, Disks (Shapes), Perturbation Theory, Radial Velocity
Scientific paper
The effect of galactic spiral structure on estimates of the mean kinematic parameters of extended stellar samples is investigated using the density-wave theory of Lin et al. (1969) to represent perturbations in the components of mean stellar velocity with respect to a differentially rotating reference frame. The variation of mean-velocity and velocity-dispersion estimates is studied which results when stars in larger and larger areas around the sun are considered, a mean asymmetrical-drift relation is derived, and the scatter exhibited by stars with small radial-velocity dispersions is explained in terms of the sun's position near the inner edge of a spiral arm. The peculiar solar motion in the direction of galactic rotation is estimated to be 6 km/s; this result is confirmed by evaluating the mean kinematic parameters of different stellar samples selected from the FK4 and FK4 Supplement Catalogs. The Fe/H abundances of stars in samples which deviate from the mean asymmetrical-drift relation are examined, the radial chemical gradient in the solar neighborhood reported by Mayor (1976) is confirmed, and it is concluded that the sample of G III stars employed in this study actually consists of evolved early dA stars plus old metal-deficient disk stars included due to a classification bias.
Gomez Adrian
Mennessier Marie-Odile
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