Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows

We present narrow-band optical and near-IR imaging and optical long-slit spectroscopic observations of Hu 1-2, a Galactic planetary nebula (PN) with a pair of [NII]-bright, fast-moving (>340 km s) bipolar knots. Intermediate-dispersion spectra are used to derive physical conditions and abundances...

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Autores: Fang, X., Guerrero, Martín A., Miranda, Luis F., Riera, A., Velázquez, P. F., Raga, A. C.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/388947
Acesso em linha:http://hdl.handle.net/10261/388947
Access Level:acceso abierto
Palavra-chave:ISM: abundances
ISM: jets and outflows
Planetary nebulae: individual: Hu 1-2
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spelling Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflowsFang, X.Guerrero, Martín A.Miranda, Luis F.Riera, A.Velázquez, P. F.Raga, A. C.ISM: abundancesISM: jets and outflowsPlanetary nebulae: individual: Hu 1-2We present narrow-band optical and near-IR imaging and optical long-slit spectroscopic observations of Hu 1-2, a Galactic planetary nebula (PN) with a pair of [NII]-bright, fast-moving (>340 km s) bipolar knots. Intermediate-dispersion spectra are used to derive physical conditions and abundances across the nebula, and high-dispersion spectra to study the spatiokinematical structure. Generally, Hu 1-2 has high He/H (≈0.14) and N/O ratios (≈0.9), typical of Type I PNe. On the other hand, its abundances of O, Ne, S, and Ar are low as compared with the average abundances of Galactic bulge and disc PNe. The position-velocity maps can be generally described as an hour-glass shaped nebula with bipolar expansion, although the morphology and kinematics of the innermost regions cannot be satisfactorily explained with a simple, tilted equatorial torus. The spatio-kinematical study confines the inclination angle of its major axis to be within 10° of the plane of sky. As in the irradiated bow-shocks of IC 4634 and NGC 7009, there is a clear stratification in the emission peaks of [O III], Hα, and [N II] in the north-west (NW) knot of Hu 1-2. Fast collimated outflows in PNe exhibit higher excitation than other low-ionization structures. This is particularly the case for the bipolar knots of Hu 1-2, with He II emission levels above those of collimated outflows in other Galactic PNe. The excitation of the knots in Hu 1-2 is consistent with the combined effects of shocks and UV radiation from the central star. The mechanical energy and luminosity of the knots are similar to those observed in the PNe known to harbour a post-common envelope (post-CE) close binary central star. © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.XF and MAG acknowledge support from grant AYA 2011-29754-C03-02. LFM is partially supported by grant AYA2011-30228-C3-01 (co-funded by FEDER funds) of the Spanish MICINN. AR is supported by grant MINECO AYA2011-30228-C03 (Spain). PFV and ACR are supported by CONACyT grant 167611 and DGAPA-PAPIIT (UNAM) grant IG100214. This paper is based on observations made with the 1.5-m telescope operated by the Instituto de Astrofísica de Andalucía at the Observatorio de Sierra Nevada, Granada, Spain, and with the NOT and the Italian Telescopio Nazionale Galileo (TNG) operated at the Observatorio del Roque de los Muchachos, La Palma, Spain, by the Nordic Optical Telescope Scientific Association and the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica), respectively. We thank Orsola De Marco, the referee of this article, for her insightful comments, which have greatly improved the quality of this article.Peer reviewedOxford University PressEuropean CommissionMinisterio de Ciencia e Innovación (España)Consejo Nacional de Ciencia y Tecnología (México)Universidad Nacional Autónoma de MéxicoConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520152025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/388947reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICINN//AYA2011-29754-C03-02info:eu-repo/grantAgreement/MICINN//AYA2011-30228-C03-01http://dx.doi.org/10.1093/mnras/stv1477Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3889472026-05-22T06:33:51Z
dc.title.none.fl_str_mv Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows
title Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows
spellingShingle Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows
Fang, X.
ISM: abundances
ISM: jets and outflows
Planetary nebulae: individual: Hu 1-2
title_short Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows
title_full Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows
title_fullStr Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows
title_full_unstemmed Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows
title_sort Hu 1-2: A metal-poor bipolar planetary nebula with fast collimated outflows
dc.creator.none.fl_str_mv Fang, X.
Guerrero, Martín A.
Miranda, Luis F.
Riera, A.
Velázquez, P. F.
Raga, A. C.
author Fang, X.
author_facet Fang, X.
Guerrero, Martín A.
Miranda, Luis F.
Riera, A.
Velázquez, P. F.
Raga, A. C.
author_role author
author2 Guerrero, Martín A.
Miranda, Luis F.
Riera, A.
Velázquez, P. F.
Raga, A. C.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Ministerio de Ciencia e Innovación (España)
Consejo Nacional de Ciencia y Tecnología (México)
Universidad Nacional Autónoma de México
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv ISM: abundances
ISM: jets and outflows
Planetary nebulae: individual: Hu 1-2
topic ISM: abundances
ISM: jets and outflows
Planetary nebulae: individual: Hu 1-2
description We present narrow-band optical and near-IR imaging and optical long-slit spectroscopic observations of Hu 1-2, a Galactic planetary nebula (PN) with a pair of [NII]-bright, fast-moving (>340 km s) bipolar knots. Intermediate-dispersion spectra are used to derive physical conditions and abundances across the nebula, and high-dispersion spectra to study the spatiokinematical structure. Generally, Hu 1-2 has high He/H (≈0.14) and N/O ratios (≈0.9), typical of Type I PNe. On the other hand, its abundances of O, Ne, S, and Ar are low as compared with the average abundances of Galactic bulge and disc PNe. The position-velocity maps can be generally described as an hour-glass shaped nebula with bipolar expansion, although the morphology and kinematics of the innermost regions cannot be satisfactorily explained with a simple, tilted equatorial torus. The spatio-kinematical study confines the inclination angle of its major axis to be within 10° of the plane of sky. As in the irradiated bow-shocks of IC 4634 and NGC 7009, there is a clear stratification in the emission peaks of [O III], Hα, and [N II] in the north-west (NW) knot of Hu 1-2. Fast collimated outflows in PNe exhibit higher excitation than other low-ionization structures. This is particularly the case for the bipolar knots of Hu 1-2, with He II emission levels above those of collimated outflows in other Galactic PNe. The excitation of the knots in Hu 1-2 is consistent with the combined effects of shocks and UV radiation from the central star. The mechanical energy and luminosity of the knots are similar to those observed in the PNe known to harbour a post-common envelope (post-CE) close binary central star. © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
publishDate 2015
dc.date.none.fl_str_mv 2015
2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/388947
url http://hdl.handle.net/10261/388947
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MICINN//AYA2011-29754-C03-02
info:eu-repo/grantAgreement/MICINN//AYA2011-30228-C03-01
http://dx.doi.org/10.1093/mnras/stv1477
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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