Isotopic Abundances in the Interstellar Medium

Details Isotopic Abundances in the Interstellar Medium Isotopic Abundances in the Interstellar Medium

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.3513f&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #35.13; Bulletin of the American Astronomical Society, Vol. 32, p.730

Astronomy and Astrophysics

Astronomy

Scientific paper

Interstellar measurements on isotopic ratios help constrain models of light element nucleosynthesis. The need for high-resolution spectroscopy arises because the wavelength separation between absorption lines from individual isotopes is small. This talk will focus on recent measurements of the 11B/10B ratio obtained at ultraviolet wavelengths with the Hubble Space Telescope and of the 7Li/6Li ratio acquired at McDonald Observatory. These observations provide key information on the mechanisms responsible for producing the light elements. In particular, the relative importance of spallation via (1) Galactic cosmic rays on interstellar C, N, and O nuclei, (2) low energy heavy nuclei on interstellar protons, and (3) neutrinos on carbon during Type II supernovae can be constrained by the interstellar data.

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