Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255..255r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 255-270.
Astronomy and Astrophysics
Astrophysics
35
Abundance, Galactic Bulge, Planetary Nebulae, Stellar Composition, Stellar Evolution, Chemical Evolution, Galactic Evolution, Heavy Elements, Metallicity
Scientific paper
The general distribution pattern of various abundance ratios, with respect to hydrogen and oxygen, in the planetary nebulae (PNe) in the galactic bulge is investigated, and the results are compared with the disk nebulae, the solar values, and the prediction based on the observed gradients in the disk. It was found that, excluding the He and N elements (which are affected by nucleosynthesis and mixing processes in the parent stars) and the Cl (which is likely to be affected by incompleteness), the mean values of the heavy element abundances in the bulge PNe are, on average, 25 percent lower than the solar values. The abundance distributions resemble those of the disk sample, with a slightly higher mean abundance in the case of oxygen.
Dennefeld Michel
Menzies John W.
Pottasch Stuart R.
Ratag Mezak A.
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