Testing Nucleosynthesis Theory of S, Cl & Ar Using Planetary Nebulae. I: Abundances in the Northern Sample

Details Testing Nucleosynthesis Theory of S, Cl & Ar Using Planetary Nebulae. I: Abundances in the Northern Sample Testing Nucleosynthesis Theory of S, Cl & Ar Using Planetary Nebulae. I: Abundances in the Northern Sample

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.1301k&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #13.01; Bulletin of the American Astronomical Society, Vol. 33, p.805

Astronomy and Astrophysics

Astronomy

Scientific paper

This paper is the first in a series which studies specifically the abundances of sulfur, chlorine, and argon in Type II planetary nebulae (PNe) in the Galactic disk, extending over a broad range in galactocentric distance. Ratios of S/O, Cl/O, and Ar/O constitute important tests of differential nucleosynthesis of these elements and serve as strict constraints on massive-star yield predictions. We present new ground-based optical spectra extending from 3600-9600Å for a sample of 19 northern Type II PNe. Observation of the strong lines of [S III] λ λ 9069,9532, allows us to extensively test their effectiveness as S abundance indicators. We also present a new sulfur ionization-correction factor, based on a grid of photoionization models, that includes the effects of matter-boundedness on the relative ionization state distributions. For this northern sample, we find average values of S/O=1.2E-2+/-0.7E-2, Cl/O=2.8E-4+/-1.3E-4, and Ar/O=6.3E-3+/-5.4E-3. We gratefully acknowledge support from the National Science Foundation through grant AST-9819123.

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