Low argon abundances in three halo planetary nebulae

Details Low argon abundances in three halo planetary nebulae Low argon abundances in three halo planetary nebulae

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..482b&link_type=abstract

Astrophysical Journal, Part 1, vol. 237, Apr. 15, 1980, p. 482-485.

Astronomy and Astrophysics

Astrophysics

30

Abundance, Argon, Astronomical Spectroscopy, Planetary Nebulae, Chemical Composition, Forbidden Transitions, Line Spectra, Neon, Nitrogen Atoms, Nuclear Reactions, Oxygen Atoms

Scientific paper

Measurements of the Ar III forbidden 7135 A line intensity have been made in the three known extreme halo planetary nebulae 108-76 deg 1, 49 + 88 deg 1, and K648. All are found to have Ar/H abundances about 1/100 of those in field planetary nebulae and the sun. Since the O/H and Ne/H abundances in these planetaries cover a wide range (approximately solar to 1/100 solar), the implication is that either the abundances of these elements have been enhanced by nuclear reactions in the planetary progenitors or Ar was synthesized galactically at a slower rate than O or Ne. In either case, it appears that Ar may be more representative of the true heavy metal abundance in planetaries than O or Ne. Finally, the N abundance in K648 has been measured to be about 1/10 of the previously determined value.

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