J/A+A/655/A46ivo://CDS.VizieR/J/A+A/655/A46doi:10.26093/cds/vizier.36550046CDSHsia C.-H.Zhang Y.Sadjadi S.Chau W.Han H.-J.Chen J.-F.2022-03-10T07:09:39Z2021-11-11T08:48:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frplanetary-nebulaeinfrared-astronomyspectroscopyastronomical-modelsWe present a visible-infrared imaging study of young planetary nebula (PN) Hubble 12 (Hb 12; PN G111.8-02.8) obtained with Hubble Space Telescope (HST) archival data and our own Canada-France-Hawaii Telescope (CFHT) measurements. Deep HST and CFHT observations of this nebula reveal three pairs of bipolar structures and an arc-shaped filament near the western waist of Hb 12. The existence of nested bipolar lobes together with the presence of H2 knots suggests that these structures originated from several mass-ejection events during the pre-PN phase. To understand the intrinsic structures of Hb 12, a three-dimensional model enabling the visualisation of this PN at various orientations was constructed. The modelling results show that Hb 12 may resemble other nested hourglass nebulae, such as Hen 2-320 and M 2-9, suggesting that this type of PN may be common and the morphologies of PNs are not so diverse as is shown by their visual appearances. The infrared spectra show that this PN has a mixed chemistry. We discuss the possible material that may cause the unidentified infrared emissions. The analyses of the infrared spectra and the spectral energy distribution suggest the existence of a cool companion in the nucleus of this object.2021A&A...655A..46Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/655/A46CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/655/A46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/655/A46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/655/A46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/655/A46https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/655/A46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/655/A46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/655/A46/listsp (Simulated spectra of possible candidate)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/655/A46/listsp?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/655/A46/listsp?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/655/A46/listsp?GETtext/xml+votable180.050000true351.5617558.18180560.005555555555555556Cone search capability for table J/A+A/655/A46/listimg (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/655/A46/listimg?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/655/A46/listimg?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/655/A46/listimg?GETtext/xml+votable180.050000true351.3454858.18180.0055555555555555566/14279https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/655/A46?format=asciiInfrareddefaultJ/A+A/655/A46/listspSimulated spectra of possible candidaterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePN namemeta.id;meta.maincharRAJ2000Simbad Hour of Right Ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Simbad Degree of Declination (J2000.0)pos.eq.dec;meta.mainMClassClassical molecular structures (1)meta.codecharspspectrummeta.ref.urlcharFileNameName of the spectral file in subdirectory spmeta.idcharJ/A+A/655/A46/listimgList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits