Contamination of the Th II line and the age of the Galaxy

Details Contamination of the Th II line and the age of the Galaxy Contamination of the Th II line and the age of the Galaxy

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.346..635l&link_type=abstract

Nature (ISSN 0028-0836), vol. 346, Aug. 16, 1990, p. 635-637. Research supported by NSF.

Mathematics

Probability

31

Chronology, Line Spectra, Milky Way Galaxy, Stellar Composition, Thorium, Abundance, Astronomical Spectroscopy, Cobalt, Dwarf Stars, G Stars, Neodymium

Scientific paper

The blending of the Th II absorption line with the Co I line in spectra of G-dwarf stars has created problems for estimating the age of the Galaxy from the Th/Nd abundance ratio in those stars. Here, the transition probability of the Co I line is determined by combining radiative lifetime and branching-ratio measurements. It is shown that the Co I contribution cannot be neglected in deriving Th/Nd ratios. By comparing these results with predictions based on models of Galactic chemical evolution, a revised age of the Galaxy of 15-20 Gyr is suggested.

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