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When shape matters: Correcting the ICFs to derive the chemical abundances of bipolar and elliptical PNe

Goncalves, DR; Wesson, R; Morisset, C; Barlow, M; Ercolano, B; (2011) When shape matters: Correcting the ICFs to derive the chemical abundances of bipolar and elliptical PNe. Proceedings of the International Astronomical Union , 7 (s283) pp. 144-147. 10.1017/S174392131201085X. Green open access

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Abstract

The extraction of chemical abundances of ionised nebulae from a limited spectral range is usually hampered by the lack of emission lines corresponding to certain ionic stages. So far, the missing emission lines have been accounted for by the ionisation correction factors (ICFs), constructed under simplistic assumptions like spherical geometry by using 1-D photoionisation modelling. In this contribution we discuss the results (Gonçalves et al. 2011, in prep.) of our ongoing project to find a new set of ICFs to determine total abundances of N, O, Ne, Ar, and S, with optical spectra, in the case of non-spherical PNe. These results are based on a grid of 3-D photoionisation modelling of round, elliptical and bipolar shaped PNe, spanning the typical PN luminosities, effective temperatures and densities. We show that the additional corrections to the widely used Kingsburgh & Barlow (1994) ICFs are always higher for bipolars than for ellipticals. Moreover, these additional corrections are, for bipolars, up to: 17% for oxygen, 33% for nitrogen, 40% for neon, 28% for argon and 50% for sulphur. Finally, on top of the fact that corrections change greatly with shape, they vary also greatly with the central star temperature, while the luminosity is a less important parameter.

Type: Article
Title: When shape matters: Correcting the ICFs to derive the chemical abundances of bipolar and elliptical PNe
Location: Puerto de la Cruz, SPAIN
Open access status: An open access version is available from UCL Discovery
DOI: 10.1017/S174392131201085X
Publisher version: https://doi.org/10.1017/S174392131201085X
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: planetary nebulae: generalradiative transfermethods: numericalISM: abundances
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10095581
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