Evidence of heavy element nucleosynthesis early in the history of the galaxy: The ultra-metal-poor star CS 22892-052

Details Evidence of heavy element nucleosynthesis early in the history of the galaxy: The ultra-metal-poor star CS 22892-052 Evidence of heavy element nucleosynthesis early in the history of the galaxy: The ultra-metal-poor star CS 22892-052

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439l..51c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 439, no. 2, p. L51-L54

Astronomy and Astrophysics

Astrophysics

65

Abundance, Galactic Halos, Heavy Elements, Metallicity, Neutrons, Nuclear Fusion, Stars, Cosmology, Galactic Evolution, Stellar Composition, Strontium, Yttrium, Zirconium

Scientific paper

We analyze the neutron-capture element (Z greater than 30) abundance distribution of the ultra-metal-poor (but neutron-capture element rich) halo star CS 22892-052. The observed stellar elemental distribution is compared with those produced by the slow and rapid neutron capture processes (i.e., the s- and r-process) in solar system material. This comparison indicates that the elemental abundances, from barium to erbium, in this Galactic halo star, have the same relative proportions as the solar system r-process distirbution. Within the uncertainties of the abundance determinations, the elements strontium and zirconium, but not yttrium, also fall on the same scaled solar r-process curve. The main component of the s-process cannot reproduce the observed neutron-capture abundances in this star. The weak component of the s-process, expected to occur during core helium burning in massive stars, can fit the relative abundance distribution of Sr and Y, but not Zr, suggesting that for the currently observed abundances in CS 22892-052, an admixture of the weak s- and the r-process might be required for production of the elements Sr to Zr. These results give evidence of the occurrence of heavy element nucleosynthesis, particularly the r-process, early in the history of the Galaxy, and further suggest a generation of massive stars (the astrophysical site for the r-process), preceding the formation of this very metal poor halo star, that was responsible for producing the observed heavy elements.

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