Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19511012m&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #110.12; Bulletin of the American Astronomical Society, Vol. 31, p.1537
Astronomy and Astrophysics
Astronomy
Scientific paper
Sulfur and argon abundance gradients for the Milky Way are presented based upon newly acquired spectrophotometry of Type II planetary nebulae (PN). These spectra extend from 3600 Angstroms-9600 Angstroms allowing us to use the [SIII] 9069 Angstroms and 9532 Angstroms lines to improve upon earlier sulfur abundance estimates. Considering that a significant portion of sulfur in PN exists in the S(+2) ionization stage, this method should allow us to extrapolate more reliable total element abundances from ionic abundances. Given the progenitor mass and location of Type II PN (close to the Galactic disk), objects in this sample are free of nucleosynthetic self-contamination and thus their S and Ar abundances in particular are expected to reflect levels of these elements in the interstellar medium at the time of PN progenitor formation. Sulfur and argon abundances also provide important information for studying massive star yields of these two elements, as well as their distribution across the Milky Way disk.
Henry Richard B. C.
Kwitter Karen B.
Milingo Jacquelynne Brenda
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