Do Planetary Nebula Progenitor Stars Affect the Chemical Evolution of Alpha Elements?

Details Do Planetary Nebula Progenitor Stars Affect the Chemical Evolution of Alpha Elements? Do Planetary Nebula Progenitor Stars Affect the Chemical Evolution of Alpha Elements?

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348702m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #487.02; Bulletin of the American Astronomical Society, Vol. 41, p.461

Astronomy and Astrophysics

Astronomy

Scientific paper

With a compilation of data from 150 Milky Way planetary nebulae (PNe), we present results from our most recent analysis of abundance patterns in Galactic disk PNe. Our data set includes O, Ne, S, Cl, and Ar abundances based on our own spectrophotometric observations, reductions, and abundance determination techniques. With a wide range of metallicities, galactocentric distances, and both Type I and non-Type I Peimbert classifications, we've examined the alpha-capture elements against HII regions and blue compact galaxies (H2BCG) in order to ferret out signatures of in situ destruction and enhancement; particularly the depletion/production of O and Ne. In summary we find no observational support for systematic differences between PNe and interstellar alpha element patterns. PN progenitors do not appear to alter their alpha elements to an extent that distinguishes in situ nucleosynthesis from the observed dispersion in abundance ratios. In addition our examination of Ne and the Ne/O ratio, as measured in PNe and H2BCG, presents no indication that Ne/O is metallicity sensitive.

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