Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nuas.conf....1p&link_type=abstract
3. International Summer School on Nuclear Astrophysics, p. 1 - 17
Astronomy and Astrophysics
Astrophysics
2
Nucleosynthesis, Nucleosynthesis: Red Giants
Scientific paper
The phenomenology of the s-process is presented: the nuclear systematics, combined to the natural abundances of the s-nuclei through the appropriate formalism, give important clues as to the relevant astrophysical conditions (temperatures, densities, timescales, etc.). After Merrill's (1952) discovery of Tc at the surface of S stars, a strong candidate site for s-element synthesis has been helium burning in red giants. Indeed, the most stable isotope of Tc (99Tc) has a relatively short lifetime (≡106y) and lies on the s-process path; this suggests that Tc (and the other s-nuclei) could be synthesized inside red giants (at typical helium burning temperatures of ≡3×108K) and transported somehow to the stellar surface. The neutron sources and the (presumed) astrophysical sites of the s-process are presented, along with some observational data.
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