Gomez-Llanos, V;
Morisset, C;
Garcia-Rojas, J;
Jones, D;
Wesson, R;
Corradi, RLM;
Boffin, HMJ;
(2020)
The impact of strong recombination on temperature determination in planetary nebulae.
Monthly Notices of the Royal Astronomical Society: Letters
, 498
(1)
L82-L86.
10.1093/mnrasl/slaa131.
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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.
| Type: | Article |
|---|---|
| Title: | The impact of strong recombination on temperature determination in planetary nebulae |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnrasl/slaa131 |
| Publisher version: | https://doi.org/10.1093/mnrasl/slaa131 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | atomic data – stars: AGB and post-AGB – ISM: abundances – planetary nebulae: individual: Abell 46, NGC 6778 |
| 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-pp.ucl.ac.uk/id/eprint/10117018 |
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