期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 510, 期 4, 页码 5444-5463出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab3523
关键词
stars: mass-loss; stars: winds, outflows; ISM: abundances; planetary nebulae: general
资金
- ESO Telescopes at the Paranal Observatory under program [081.D-0857, 097.D0241]
- State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU) [SEV-2015-0548, CEX2019-000920-S]
- European Regional Development Fund (FEDER) [AYA201783383-P]
- Canarian Agency for Research, Innovation and Information Society (ACIISI), of the Canary Islands Government
- European Regional Development Fund (ERDF) [ProID2021010074]
- Spanish Ministry of Science, Innovation and Universities [P/308614]
- General Budgets of the Autonomous Community of the Canary Islands by the MCIU
- visitor grant under the Severo Ochoa excellence program [CEX2019-000920-S]
- Erasmus + program of the European Union [2020-1-CZ01-KA203-078200]
- CAPES
- CNPq
- FAPEMIG
- CNPq [436117/2018-5]
- [UNAM/PAPIIT -IN101220]
- [APQ-01305-17]
In this study, we used MUSE deep integral-field unit spectroscopy to observe three planetary nebulae with high-abundance discrepancy factors (ADF > 20) and investigated the extinction, electron temperature, electron density, and ionic abundances of various ionic species. We found evidence of two distinct gas phases within each nebula, with similar oxygen content in the cold and warm regions.
We present MUSE deep integral-field unit spectroscopy of three planetary nebulae (PNe) with high-abundance discrepancy factors (ADF > 20): NGC 6778, M 1-42, and Hf 2-2. We have constructed flux maps for more than 40 emission lines, and use them to build extinction, electron temperature (T-e), electron density (n(e)), and ionic abundances maps of a number of ionic species. The effects of the contribution of recombination to the auroral [N II] and [O II] lines on T-e and the abundance maps of low-ionization species are evaluated using recombination diagnostics. As a result, low T-e values and a downward gradient of T-e are found toward the inner zones of each PN. Spatially, this nearly coincides with the increase of abundances of heavy elements measured using recombination lines in the inner regions of PNe, and strongly supports the presence of two distinct gas phases: a cold and metal-rich and a warm one with 'normal' metal content. We have simultaneously constructed, for the first time, the ADF maps of O+ and O2+ and found that they centrally peak for all three PNe under study. We show that the main issue when trying to compute realistic abundances from either ORLs or CELL is to estimate the relative contribution of each gas component to the H I emission, and we present a method to evaluate it. It is also found that, for the studied high-ADF PNe, the amount of oxygen in the cold and warm regions is of the same order.
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