J/A+A/619/A84ivo://CDS.VizieR/J/A+A/619/A84doi:10.26093/cds/vizier.36190084CDSBoffin H.M.J.Jones D.Wesson R.Beletsky Y.Miszalski B.Saviane I.,Monaco L.Corradi R.Santander Garcia M.Rodriguez-Gil P.2019-01-30T05:23:16Z2018-11-08T08:12:53ZCDS support team

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

cds-question@unistra.frplanetary-nebulaeeclipsing-binary-starsphotometryBipolar planetary nebulae (PNe) are thought to result from binary star interactions and, indeed, tens of binary central stars of PNe have been found, in particular using photometric time-series that allow detecting post-common envelope systems. Using photometry at the NTT in La Silla we have studied the bright object close to the centre of PN M3-2 and found it to be an eclipsing binary with an orbital period of 1.88 days. However, the components of the binary appear to be two A or F stars, of almost equal masses, and are thus too cold to be the source of ionisation of the nebula. Using deep images of the central star obtained in good seeing, we confirm a previous result that the central star is more likely a much fainter star, located 2 arcsec away from the bright star. The eclipsing binary is thus a chance alignment on top of the planetary nebula. We also studied the nebular abundance and confirm it to be a Type I PN.2018A&A...619A..84Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/619/A84CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/619/A84https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/619/A84http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/619/A84https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/619/A84https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/619/A84http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/619/A84GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/619/A84/tablea1Photometry of the bright star inside M3-2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpochMJD datedtime.epochdoubleImag1Differential I magnitude target - comp1phot.mag;arith.difffloate_Imag1Error on Imag1stat.errorfloatImag2Differential I magnitude comp1 - comp2phot.mag;arith.difffloate_Imag2Error on Imag2stat.errorfloatJ/A+A/619/A84/tablea2Line intensities in the nebula of M3-2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaObsObserved wavelength of line0.1nmem.wlfloatlambdaTrueTrue wavelength of line0.1nmem.wlfloatFluxMeasured flux (1)phot.fluxdoublee_Fluxrms uncertainty on Fluxstat.error;phot.fluxfloatIntIntensity of line (1)spect.line.intensitydoubleE_IntError on intensity of line (upper value)stat.error;stat.maxfloate_IntError on intensity of line (lower value)stat.errorfloatIdentLine identificationmeta.id;spect.linecharMulMultiplet of the linephys.atmol.levelcharlowLower term of the multipletphys.atmol.termcharhighHigher term of the multipletphys.atmol.termcharg1? Statistical weight of the lower energy level of the transitionstat.weight;phys.atmolintnullableg2? Statistical weight of the upper energy level of the transitionstat.weight;phys.atmolintnullable