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The role of shocks in the determination of empirical abundances for type-I PNe

Published online by Cambridge University Press:  30 December 2019

Roberto D. D. Costa  and
Paulo J. A. Lago
Roberto D. D. Costa
Affiliation:
Departamento de Astronomia - IAG - Universidade de São Paulo Rua do Matão 1226, Cidade Universitária, 05508-090, São Paulo/SP, Brasil email: [email protected]
Paulo J. A. Lago
Affiliation:
Departamento de Astronomia - IAG - Universidade de São Paulo Rua do Matão 1226, Cidade Universitária, 05508-090, São Paulo/SP, Brasil email: [email protected]
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Abstract

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We investigate, in the light of new diagnostic diagrams, the role of shocks in the ionization profile of type-I planetary nebulae, and their relation to the empirical derivation of chemical abundances. We apply our technique to two well-known type-I objects: NGC 2440 and NGC 6302. Our results indicate that shocks play a very important role in the spectra of both nebulae and, since the presence of shocks reinforces the flux of low ionization lines, this artificial reinforcement can lead to incorrect chemical abundances, when they are derived through Ionization Correction Factors, at least for type-I PNe.

Keywords

ISM: abundancesplanetary nebulae: generalplanetary nebulae: individual (NGC 2440, NGC 6302)techniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 377 - 378
Copyright
© International Astronomical Union 2019 

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