The impact of strong recombination on temperature determination in planetary nebulae

Author:

Gómez-Llanos V1ORCID,Morisset C1,García-Rojas J23ORCID,Jones D3ORCID,Wesson R4,Corradi R L M35,Boffin H M J6ORCID

Affiliation:

1. Instituto de Astronomia (IA), Universidad Nacional Autónoma de México, Apdo. postal 106, C.P. 22800 Ensenada, Baja California, México

2. Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain

3. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain

4. Department of Physics and Astronomy, University College London, Gower St, London WC1E 6BT, UK

5. GRANTECAN, Cuesta de San José s/n, E-38712 Breña Baja, La Palma, Spain

6. European Southern Observatory, Karl-Schwarzschild-Str 2, D-85748 Garching bei Muenchen, Germany

Abstract

ABSTRACT The long-standing difference in chemical abundances determined from optical recombination lines and collisionally excited lines raises questions about our understanding of atomic physics, as well as the assumptions made when determining physical conditions and chemical abundances in astrophysical nebulae. Here, we study the recombination contribution of [O iii] 4363 and the validity of the line ratio [O iii] 4363/4959 as a temperature diagnostic in planetary nebulae with a high abundance discrepancy. We derive a fit for the recombination coefficient of [O iii] 4363 that takes into account the radiative and dielectronic recombinations, for electron temperatures from 200 to 30 000 K. We estimate the recombination contribution of [O iii] 4363 for the planetary nebulae Abell 46 and NGC 6778 by subtracting the collisional contribution from the total observed flux. We find that the spatial distribution for the estimated recombination contribution in [O iii] 4363 follows that of the O ii 4649 recombination line, both peaking in the central regions of the nebula, especially in the case of Abell 46 that has a much higher abundance discrepancy. The estimated recombination contribution reaches up to 70 and 40 per cent of the total [O iii] 4363 observed flux, for Abell 46 and NGC 6778, respectively.

Funder

Consejo Nacional de Ciencia y Tecnología

Universidad Nacional Autónoma de México

European Regional Development Fund

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 6 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Exploring the high abundance discrepancy in the planetary nebula IC 4663;Frontiers in Astronomy and Space Sciences;2023-12-18

2. NGC 6153: Reality is Complicated*;The Astronomical Journal;2022-11-11

3. Spectroscopic analysis tool for intEgraL fieLd unIt daTacubEs (satellite): case studies of NGC 7009 and NGC 6778 with MUSE;Monthly Notices of the Royal Astronomical Society;2022-03-10

4. Abundance discrepancy factors in high-density planetary nebulae;Monthly Notices of the Royal Astronomical Society;2022-01-07

5. MUSE spectroscopy of planetary nebulae with high abundance discrepancies;Monthly Notices of the Royal Astronomical Society;2021-12-03

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