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Nuclear processing and isotopes in the galaxy.

A A Penzias

    Science (New York, N.Y.)
    |May 16, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Stable isotope distributions of elements like hydrogen and carbon in the galaxy reveal insights into stellar evolution. Enhanced carbon-13 near the galactic center suggests increased star formation and processed material.

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    Area of Science:

    • Astronomy and Astrophysics
    • Cosmochemistry
    • Nuclear Astrophysics

    Background:

    • Galactic chemical evolution is shaped by stellar nucleosynthesis and star formation.
    • Isotopic abundances in interstellar molecules provide tracers of galactic processes.
    • The solar system's isotopic composition offers a benchmark for comparison with interstellar material.

    Purpose of the Study:

    • To map the galactic distributions of stable isotopes of key elements (H, C, N, O, S, Si).
    • To compare interstellar isotopic abundances with those found in the solar system.
    • To understand the implications for stellar evolution, galactic processing, and solar system formation.

    Main Methods:

    • Analysis of interstellar molecules containing stable isotopes.

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  • Derivation of isotopic abundances from molecular spectral data.
  • Comparison of observed interstellar isotopic ratios with solar system values.

    • Main Results:

    • Galactic distributions of H, C, N, O, S, and Si isotopes were mapped.
    • An enhanced abundance of processed material, particularly carbon-13, was observed near the galactic center, correlating with higher star formation rates.
    • Significant differences were found between interstellar and solar system isotopic abundances.

    Conclusions:

    • The observed isotopic distributions align with models of stellar evolution and galactic nuclear processing.
    • The enhanced carbon-13 in the galactic center supports models of increased star formation and material processing in this region.
    • Discrepancies between interstellar and solar system isotopic compositions suggest ongoing stellar processing and the potential presence of atypical nuclear material in the solar system.