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Chemical composition of the Galactic bulge from deep spectroscopy of planetary nebulae

Published online by Cambridge University Press:  15 December 2006

W. Wang  and
X.-W. Liu
W. Wang
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, China email: [email protected], [email protected]
X.-W. Liu
Affiliation:
Department of Astronomy, Peking University, Beijing 100871, China email: [email protected], [email protected]
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Abstract

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Previous abundance analyses for the Galactic bulge using giant stars, RR Lyrae variables and PNe (based on the traditional method by means of collisionally excited lines – CELs) as tracers yielded different results (c.f. the review by McWilliam (1997, ARAA, 35, 503 and references therein). We have obtained deep long-slit medium resolution spectra for a sample of 25 Galactic bulge PNe (GBPNe) and 6 Galactic disk PNe (GDPNe) with which we have carried out detailed extinction analyses, plasma diagnostics and elemental abundance determinations, using both CELs and optical recombinations lines (ORLs) from heavy elemental ions. Here we report the preliminary results and compare them with earlier work for both bulge and disk PNe.

Keywords

Galaxy: abundances; planetary nebulae: generalabundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 539 - 540
Copyright
© 2006 International Astronomical Union