Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62..687m&link_type=abstract
(Astronomicheskii Zhurnal, vol. 62, July-Aug. 1985, p. 687-696) Soviet Astronomy (ISSN 0038-5301), vol. 29, July-Aug. 1985, p. 4
Astronomy and Astrophysics
Astronomy
5
Hertzsprung-Russell Diagram, Metallicity, Red Giant Stars, Stellar Composition, Stellar Evolution, Iron, Stellar Color, Stellar Luminosity, Stellar Spectra
Scientific paper
Using photometric data for about 1400 disk-population red giants the authors investigate the metallicity variations in function of the spectral class (color) and of the luminosity. They find that the G8 III stars are the most metal-deficient ones and also have the smallest metallicity scatter, forming thus the most homogeneous metallicity group of stars. The most metal-abundant ones are the K2 III stars, and this group of giants shows the largest scatter of metallicity. The metal-deficient giant population of the galactic disk is found to lack stars which could be older than the open cluster NGC 188, i.e. ≈7×109years. This corroborates the view that the disk is ≡6×109years younger than the halo, the age of which is apparently not less than 13×109years.
Marsakov V. A.
Suchkov Anatoly A.
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