Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725606g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #256.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
It has been known for several years that planetary nebulae (PNe) follow a different relationship from other objects which have sulfur and oxygen emission lines in their spectra, e.g., H II regions, and Blue Compact Galaxies (BCGs) when log(S/H) is plotted versus log(O/H). The HII regions and BCGs show a rather tight linear relationship between log(S/H) and log(O/H) over several orders of magnitude in these abundances. However, PNe concentrate towards higher values of both log(S/H) and log(O/H) (except for a few halo PNe which have lower values) and generally don't follow the relationship defined by the HII regions and BCGs. We are investigating the cause of this apparent "sulfur anomaly” by using a sample of about 160 PNe which have abundances determined in a uniform fashion. We consider the derived abundances in combination with other nebular and stellar properties to investigate various possibilities that have been proposed (ionization correction factors don't account correctly for sulfur emission lines in IR/UV, sulfur not observed due to presence in grains/molecules, PNe oxygen abundances more enhanced than previously predicted).
Balick Bruce
Braxton Kelsey
Green Jerica M.
Lutz Jack
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