J/MNRAS/473/2275ivo://CDS.VizieR/J/MNRAS/473/2275doi:10.26093/cds/vizier.74732275CDSMiszalski B.Manick R.Mikolajewska J.Ilkiewicz K.Kamath D.,Van Winckel H.2024-08-17T20:21:29Z2021-02-10T14:58:42ZCDS support team

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

cds-question@unistra.frplanetary-nebulaeastrometryWhether planetary nebulae (PNe) are predominantly the product of binary stellar evolution as some population synthesis models (PSM) suggest remains an open question. Around 50 short-period binary central stars (P~1d) are known, but with only four with measured orbital periods over 10 d, our knowledge is severely incomplete. Here we report on the first discovery from a systematic Southern African Large Telescope (SALT) High Resolution Spectrograph (HRS) survey for long-period binary central stars. We find a 142d orbital period from radial velocities of the central star of NGC 1360, HIP 16566. NGC 1360 appears to be the product of common-envelope (CE) evolution, with nebula features similar to post-CE PNe, albeit with an orbital period considerably longer than expected to be typical of post-CE PSM. The most striking feature is a newly identified ring of candidate low-ionization structures. Previous spatiokinematic modelling of the nebula gives a nebula inclination of 30{deg}+/-10{deg}, and assuming the binary nucleus is coplanar with the nebula, multiwavelength observations best fit a more massive, evolved white dwarf (WD) companion. A WD companion in a 142d orbit is not the focus of many PSM, making NGC 1360 a valuable system with which to improve future PSM work. HIP 16566 is amongst many central stars in which large radial velocity variability was found by low-resolution surveys. The discovery of its binary nature may indicate long-period binaries may be more common than PSM models predict.2018MNRAS.473.2275Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/473/2275CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/473/2275https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/473/2275http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/473/2275https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/473/2275https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/473/2275http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/473/2275GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/473/2275/tablea1 (Coordinates of the low-ionization structures (LIS) candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/473/2275/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/473/2275/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/473/2275/tablea1?GETtext/xml+votable180.050000true53.25077806-25.858596940.0055555555555555566/36130-36131https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/473/2275?format=asciidefaultJ/MNRAS/473/2275/tablea1Coordinates of the low-ionization structures (LIS) candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.main