J/A+A/562/A89ivo://CDS.VizieR/J/A+A/562/A89doi:10.26093/cds/vizier.35620089CDSJones D.Boffin H.M.J.Miszalski B.Wesson R.Corradi R.L.M.,Tyndall A.A.2018-03-21T05:20:16Z2014-02-11T11:55:27ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsplanetary-nebulaeccd-photometryspectroscopyWe present a detailed photometric study of the central star system of the planetary nebula Hen 2-11, selected for study because of its low-ionisation filaments and bipolar morphology - traits which have been strongly linked with central star binarity. Photometric monitoring with NTT-EFOSC2 reveals a highly irradiated, double-eclipsing, post-common-envelope system with a period of 0.609 d. Modelling of the lightcurve indicates that the nebular progenitor is extremely hot, while the secondary in the system is probably a K-type main sequence star. The chemical composition of the nebula is analysed, showing Hen 2-11 to be a medium-excitation non-Type I nebula. A simple photoionisation model is constructed determining abundance ratios of C/O and N/O which would be consistent with the common-envelope cutting short the AGB evolution of the nebular progenitor. The detection of a post-common-envelope binary system at the heart of Hen 2-11 further strengthens the link between binary progeny and the formation of axisymmetric planetary nebulae with patterns of low-ionisation filaments, clearly demonstrating their use as morphological indicators of central star binarity.2014A&A...562A..89Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/562/A89CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/562/A89https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/562/A89http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/562/A89https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/562/A89https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/562/A89http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/562/A89GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/562/A89defaultJ/A+A/562/A89/listList of FITS spectraObsDateDate of observationtime.epochnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda1[3900/6300] Lower value of wavelength interval0.1nmem.wl;stat.minfloatlambda2[6180/9300] Upper value of wavelength interval0.1nmem.wl;stat.maxfloatdlambda[0.66/0.98] Wavelength step (resolution)0.1nmem.wl;arith.difffloatNx[3170] Number of wavelengthsmeta.numberintNsp[1/2] Number of files (2nd is background)meta.numberintspPlot the spectrummeta.ref.urlcharFileNameName of FITS file in subdirectory spmeta.id;meta.fitscharTitleTitle fo the spectrummeta.notecharAssocDataAssociated Data web pagemeta.bib.pagecharJ/A+A/562/A89/photi-band photometry of Hen 2-11 central starrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Datedtime.epochdoubleimagGunn i-band apparent magnitudemagphot.mag;em.opt.Ifloate_imagUncertainty of Gunn i-band magnitudemagstat.error;phot.mag;em.opt.Ifloat