Abstract
view Abstract Citations (34) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Low argon abundances in three halo planetary nebulae. Barker, T. Abstract 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. Publication: The Astrophysical Journal Pub Date: April 1980 DOI: 10.1086/157891 Bibcode: 1980ApJ...237..482B Keywords: Abundance; Argon; Astronomical Spectroscopy; Planetary Nebulae; Chemical Composition; Forbidden Transitions; Line Spectra; Neon; Nitrogen Atoms; Nuclear Reactions; Oxygen Atoms; Astrophysics full text sources ADS | data products SIMBAD (3)
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