1. As reported by the Astrochemistry Working Group of Division VI (Interstellar Matter) of the International Astronomical Union (www.strw.leidenuniv.nl/ iau34/links.html).
2. CI is used to denote neutral atomic C (C) CII to denote singly ionized C (C + ) CIII to denote doubly ionized C (C 2+ ) and so forth.
3. The solar mass M ⊙ is equal to 1.989 10 30 kg.
4. Synthesis of the Elements in Stars
5. 4 He(α ) 8 Be(α ) 12 C * ( γ γ) 12 C.