Magnesium isotopes in metal-poor and metal-rich stars

Details Magnesium isotopes in metal-poor and metal-rich stars Magnesium isotopes in metal-poor and metal-rich stars

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178..199b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 199-202. Research supported by the Fundacao de Ampa

Astronomy and Astrophysics

Astrophysics

13

Abundance, Magnesium Isotopes, Metallic Stars, Metallicity, Nuclear Fusion, Stellar Composition, Dwarf Stars, Galactic Evolution, Supernova Remnants, Supernovae

Scientific paper

An isotopic abundance analysis for Mg in dwarfs with different metallicities, using high resolution, high signal to noise spectra, shows that the 25Mg and 26Mg isotopes are underabundant in the metal-deficient stars relative to solar system material. This confirms that, in the early history of the Galaxy when the general enrichment of heavy elements was much smaller than it is now, the production of 25Mg and 26Mg as well as the production of the neutron rich elements 23Na, 27Al would have been smaller (relative to 24Mg) than it is now. In the young metal-rich dwarfs, the ratios 25Mg/24Mg and 26Mg/24Mg appear to be close to the solar (terrestrial) values.

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