On nitrogen abundances of planetary nebulae

Details On nitrogen abundances of planetary nebulae On nitrogen abundances of planetary nebulae

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197....1w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 1-6.

Astronomy and Astrophysics

Astronomy

13

Abundance, Astronomical Spectroscopy, Forbidden Transitions, Nitrogen Ions, Planetary Nebulae, Astronomical Models, Oxygen, Stellar Spectrophotometry

Scientific paper

Observations of N II recombination lines in the planetary nebula NGC 3242 are presented which allow the first temperature-independent measurement of the nitrogen abundance of a nebula. Model nebula calculations are utilized to identify a reliable N/H indicator. The standard technique employing strong forbidden lines and the approximation that N/O is equal to approximately N(+)/O(+) may introduce systematic errors greater than 25%. A good compromise is to set N/He = (N2(+) + N(+))/He(+). The N/H abundance deduced in this manner is in reasonable (about 25%) agreement with that deduced from the standard analysis.

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