The Initial Abundance of 60Fe in the Solar System

Details The Initial Abundance of 60Fe in the Solar System The Initial Abundance of 60Fe in the Solar System

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...588l..41t&link_type=abstract

The Astrophysical Journal, Volume 588, Issue 1, pp. L41-L44.

Astronomy and Astrophysics

Astronomy

116

Methods: Analytical, Nuclear Reactions, Nucleosynthesis, Abundances, Solar System: Formation

Scientific paper

60Fe, which decays to radiogenic 60Ni (60Ni*), is a now extinct radionuclide. 60Fe is produced only in stars and thus provides a constraint on the stellar contribution to solar system radionuclides. Its short half-life [t1/2=1.49×106 yr (1.49 Myr)] makes it a potential chronometer for the early solar system. We found clear evidence for 60Ni* in troilite (FeS) grains from the Bishunpur and Krymka chondrites, two of the least metamorphosed (LL3.1) ordinary chondrites. The weighted means of inferred initial 60Fe/56Fe ratios [(60Fe/56Fe)0] for the troilites are (1.08+/-0.23)×10-7 and (1.73+/-0.53)×10-7 for Bishunpur and Krymka, respectively. We compare our data with upper limits established previously on (60Fe/56Fe)0 for a chondrule in an unequilibrated ordinary chondrite, Semarkona, and for troilites in a relatively metamorphosed chondrite, Ste. Marguerite, taking into account their 26Al-26Mg ages. The 60Fe and 26Al chronometers can be combined to produce a consistent chronology for Ca-Al-rich inclusions, which are thought to be the earliest solar system solids, chondrules, troilites, and Ste. Marguerite. The initial 60Fe/56Fe for the solar system is inferred from this chronology to have been 2.8×10-7 to 4×10-7. This is at or below the low end of predictions for a supernova source.

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