Other
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..34..152h&link_type=abstract
Earth and Planetary Science Letters, vol. 34, no. 1, Feb. 1977, p. 152-154.
Other
7
Abundance, Calcium, Carbonaceous Chondrites, Sodium, Solar Atmosphere, Sulfur, Atmospheric Composition, Interstellar Gas, Mass Ratios, Spectrum Analysis
Scientific paper
Solar abundances based on recent laboratory oscillator strengths confirm the relationship between solar matter and carbonaceous chondrites. Within spectroscopic uncertainties these meteorites contain refractory and volatile elements in solar proportions. Significant improvement of accuracy at present seems restricted to a few abundant elements having reliable quantum-mechanical oscillator strengths and necessitates strictly differential spectrum analysis. Taking this into account, the solar abundance ratios Na/Ca and S/Ca have been determined to an accuracy of + or - 15%. The results are: Na/Ca 0.91 and S/Ca 6.8. These volatile/refractory ratios just match type 1 carbonaceous chondrites, but contrast with other types. These and related interstellar-abundance features place constraints on the condensation process and a potential heterogeneity of the solar nebula. There is evidence that no drastic presolar separation of interstellar gas and grains has occurred, but minor imbalance may be a common mechanism codetermining stellar metal content.
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