On the abundances of C, N, O in planetary nebulae

Details On the abundances of C, N, O in planetary nebulae On the abundances of C, N, O in planetary nebulae

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mmsai..50..171p&link_type=abstract

(Workshop on Chemical Inhomogeneities in the Galaxy, Frascati, Italy, May 29-June 2, 1978.) Società Astronomica Italiana, Memori

Astronomy and Astrophysics

Astronomy

Abundance, Carbon, Nitrogen, Oxygen, Planetary Nebulae, Charge Exchange, Interstellar Chemistry, Optical Thickness

Scientific paper

The determination of abundances of C, N, O in planetary nebulae is briefly discussed. For 'normal' planetaries the ratio C/O appears in average not far from the solar value. The charge exchange reactions of heavy elements with hydrogen are shown to affect in particular the current assumption N/O equals N(plus)/O(plus), usually employed to deduce the nitrogen abundance. Optically thin cases are different, in this respect, from the optically thick ones.

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