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Title:
Sulfur, Chlorine, and Argon in Planetary Nebulae. I. Observations and Abundances in a Northern Sample
Authors:
Kwitter, K. B.; Henry, R. B. C.
Affiliation:
AA(Department of Astronomy, Williams College, Williamstown, MA 01267; ), AB(Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019; )
Publication:
The Astrophysical Journal, Volume 562, Issue 2, pp. 804-823. (ApJ Homepage)
Publication Date:
12/2001
Origin:
UCP
ApJ Keywords:
ISM: Abundances, Nuclear Reactions, Nucleosynthesis, Abundances, ISM: Planetary Nebulae: General, Stars: Evolution
DOI:
10.1086/322505
Bibliographic Code:
2001ApJ...562..804K

Abstract

This paper is the first of a series specifically studying the abundances of sulfur, chlorine, and argon in type II planetary nebulae (PNe) in the Galactic disk. 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 3600-9600 Å for a sample of 19 type II northern PNe. This range includes the strong near-infrared lines of [S III] λλ9069,9532, which allows us to test extensively their effectiveness as sulfur abundance indicators. We also introduce a new, model-tested ionization correction factor for sulfur. For the present sample, we find average values of S/O=1.2×10-2+/-0.71×10-2, Cl/O=3.3×10-4+/-1.6×10-4, and Ar/O=5.0×10-3+/-1.9×10-3.

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Part 1     Part  3     Part  2     Part  4    

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