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Chemical Abundances in Galactic Bulge Pn

Published online by Cambridge University Press:  07 August 2017

N.A. Walton ,
M.J. Barlow  and
R.E.S. Clegg
N.A. Walton
Affiliation:
Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, England
M.J. Barlow
Affiliation:
Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, England
R.E.S. Clegg
Affiliation:
Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ, England

Abstract

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We present abundance determinations, in particular of carbon, and C/O ratios, for 11 Galactic bulge planetary nebulae (PN) based on our low resolution UV data from IUE observations and optical spectrophotometry from the Anglo-Australian Telescope. We compare the observed abundances with those predicted by dredge-up theory for the high metallicity Galactic bulge. The sample abundances are also contrasted with the abundances found for PN in the Galactic disk. The mean C/O ratio for the bulge PN is significantly lower than that found for Galactic disk PN. Further, we present an abundance analysis of the very metal-poor bulge PN M2-29. From an analysis of the differential extinction found from the observed ratios of the He ii 1640,4686Å lines, we find that the ultraviolet reddening law towards the bulge is steeper than in the solar neighbourhood.

Type
VI. Planetary Nebulae in Galactic Systems
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 581
Copyright
Copyright © Kluwer 1993