Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..77....3s&link_type=abstract
Astrophysics and Space Science, vol. 77, no. 1, June 1981, p. 3-22.
Astronomy and Astrophysics
Astrophysics
13
Abundance, Globular Clusters, Metallic Stars, Star Distribution, Star Formation, Dwarf Stars, F Stars, G Stars, Hydrogen, Iron, Kinematics, Late Stars
Scientific paper
The metal abundance distribution, or metallicity function, of stars and globular clusters is investigated. The three gaps found are near Fe/H = -1.0, -0.5, and -0.1. It is shown that the gaps are statistically significant practically at the 100% confidence level. It is noted that the gaps divide the galactic population into four metallicity groups with an average Fe/H of about -1.5, -0.8, -0.25, and +0.10 (groups I, II, III, and IV, respectively). The principal contribution to the scatter of metallicity within the groups (with the exception of group I) comes from random errors in abundance measurements. It is therefore inferred that the actual metallicity function must be essentially discrete. It is found that the kinematics and metallicity of groups III and IV of F and G dwarfs show a paradox; the metal-rich group (group IV) of G dwarfs turns out to be kinematically older than the group III of F dwarfs with half the metal abundance. The implications of this result for star formation are discussed.
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