Can Dust and Molecules Explain the Sulfur Anomaly in Planetary Nebulae?

Details Can Dust and Molecules Explain the Sulfur Anomaly in Planetary Nebulae? Can Dust and Molecules Explain the Sulfur Anomaly in Planetary Nebulae?

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545422s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #454.22; Bulletin of the American Astronomical Society, Vol. 42, p.472

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent studies of planetary nebulae have shown that their atomic/ionized sulfur abundances are lower than those for HII regions and blue compact galaxies for the same oxygen abundance. For optical-only observations, the abundance of triply-ionized sulfur must be inferred indirectly and could lead to underestimates of the total sulfur abundance. However, studies in the infrared (using ISO and Spitzer) show that the problem remains even when IR ionized emission lines are included in the calculated abundances.
To resolve this problem, we consider the potential sinks for sulfur atoms. We investigate whether the observed sulfur anomaly can be explained by sequestering sulfur atoms into either solid state or molecular species.

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