Interstellar $^{36}$S: a probe of s-process nucleosynthesis
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The first detection of a $^{36}$S-bearing molecule in interstellar space is reported. The $J$=$2-1$ and $3-2$ transitions of C$^{36}$S have been observed toward eight Galactic molecular hot cores. From a comparison with other optically thin isotopic species of CS, the abundance ratio of $^{34}$S/$^{36}$S is 115$(\pm 17)$. This is smaller than the solar system ratio of 200 and supports the idea that $^{36}$S is, unlike the other stable sulfur isotopes, a purely secondary nucleus that is produced by s-process nucleosynthesis in massive stars.
4 pages uuencoded gzip-compressed .tar file including two figures, To appear in A&A Letter
4 pages uuencoded gzip-compressed .tar file including two figures, To appear in A&A Letter