Iron isotope anomalies. [In carbonaceous meteorites]

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/185603· OSTI ID:6966460

Voelkening, J; Papanastassiou, D A ^[1]

---

1. California Institute of Technology, Pasadena (USA)

Precise determinations of the Fe isotope abundances yield identical results for a terrestrial standard and for samples of carbonaceous meteorites. Fe-54/Fe-56 = 0.062669; Fe-57/Fe-56 = 0.023261 + or - 0.000002; and Fe-58/Fe-56 = 0.0031132 + or - 0.0000011 are found. Refractory element-rich inclusions from the Allende carbonaceous meteorite yield hints of deficits in Fe-57/Fe-56 of up to -3.9 + or - 2.6 parts in 10,000 and a hint of excess in Fe-58/Fe-56 of up to 27 + or - 11 parts in 10,000. One special (FUN) inclusion shows a large excess of 2.9 percent, uniquely attributable to Fe-58. This excess correlates with large excesses in the same inclusion in the neutron-rich isotopes Ca-48, Ti-50 and Cr-54. These results strengthen the evidence for an exotic nucleosynthetic component produced by neutron-rich, statistical equilibrium burning, and injected into the interstellar medium. 29 refs.

• Research Organization: California Inst. of Tech., Pasadena, CA (USA)
• OSTI ID: 6966460
• Journal Information: Astrophysical Journal; (USA), Vol. 347; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
METEORITES
CHEMICAL COMPOSITION
ELEMENT ABUNDANCE
IRON ISOTOPES
SOLAR SYSTEM
SUPERNOVAE
THERMONUCLEAR REACTIONS
ABUNDANCE
ERUPTIVE VARIABLE STARS
ISOTOPES
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
STARS
SYNTHESIS
VARIABLE STARS
640107* - Astrophysics & Cosmology- Planetary Phenomena