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dc.contributor.author
Mari, María Belén
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dc.contributor.author
Akras, Stavros
dc.contributor.author
Gonçalves, Denise R.
dc.date.available
2024-01-10T14:17:00Z
dc.date.issued
2023-10
dc.identifier.citation
Mari, María Belén; Akras, Stavros; Gonçalves, Denise R.; Low-ionization structures in planetary nebulae - III: The statistical analysis of physico-chemical parameters and excitation mechanisms; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 525; 2; 10-2023; 1998-2014
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/223226
dc.description.abstract
Nearly 30 yr after the first detailed studies of low-ionization structures (LISs) in planetary nebulae (PNe), we perform a statistical analysis of their physical, chemical, and excitation properties, by collecting published data in the literature. The analysis was made through the contrast between LISs and high-ionization structures - rims or shells - for a large sample of PNe, in order to highlight significant differences between these structures. Our motivation was to find robust results based on the largest sample of LISs gathered so far. (i) Indeed, LISs have lower electron densities (Ne[S ii]) than the rims/shells. (ii) The nitrogen electron temperatures (Te[N ii]) are similar between the two groups, while a bimodal distribution is observed for the Te based on [O iii] of the rims/shells, although the high- and low-ionization structures have Te[O iii] of similar median values. (iii) No significant variations are observed in total abundances of He, N, O, Ne, Ar, Cl, and S between the two groups. (iv) Through the analysis of several diagnostic diagrams, LISs are separated from rims/shells in terms of excitation. From two large grids of photoionization and shock models, we show that there is an important overlap between both mechanisms, particularly when low-ionization line ratios are concerned. We found a good tracer of high-velocity shocks, as well as an indicator of high- and low-velocity shocks that depends on temperature-sensitive line ratios. In conclusion, both excitation mechanisms could be present; however, shocks cannot be the main source of excitation for most of the LISs of PNe.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
ISM: JETS AND OUTFLOWS
dc.subject
ISM: KINEMATICS AND DYNAMICS
dc.subject
PLANETARY NEBULAE: GENERAL
dc.subject.classification
Otras Ciencias Naturales y Exactas
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dc.subject.classification
Otras Ciencias Naturales y Exactas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Low-ionization structures in planetary nebulae - III: The statistical analysis of physico-chemical parameters and excitation mechanisms
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-01-04T14:58:44Z
dc.journal.volume
525
dc.journal.number
2
dc.journal.pagination
1998-2014
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Mari, María Belén. Universidade Federal do Rio de Janeiro; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
dc.description.fil
Fil: Akras, Stavros. National Observatory of Athens; Grecia
dc.description.fil
Fil: Gonçalves, Denise R.. Universidade Federal do Rio de Janeiro; Brasil
dc.journal.title
Monthly Notices of the Royal Astronomical Society
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stad2256
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/525/2/1998/7231839
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/arxiv/https://arxiv.org/abs/2308.04577
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