The argon abundance in planetary nebulae

Details The argon abundance in planetary nebulae The argon abundance in planetary nebulae

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..207r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 1, Jan. 1990, p. 207-212.

Astronomy and Astrophysics

Astrophysics

4

Abundance, Argon, Ionized Gases, Planetary Nebulae, Cations, Galactic Nuclei

Scientific paper

The important ionization stages of argon in planetary nebulae are studied. The summation of Ar(2+) and Ar(3+) range, approximately from 2 to 8 with a peak at about class 4. Ar(2+) alone clearly predominates in the classes 2 to 6. The fraction of ions in lower stages competes with that of Ar(2+) and Ar(3+) in very low excitation nebulae, while in very high excitation nebulae (excitation class greater than 8), the summation of ions in higher stages becomes equally important compared to Ar(2+) and Ar(3+). This study provides also alternative ionization correction factors (ICFs) which are reasonably accurate in deriving the total argon abundance based only on a single ion, either Ar(2+) or Ar(3+), as well as on the summation of them.

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