J/A+A/567/A30ivo://CDS.VizieR/J/A+A/567/A30doi:10.26093/cds/vizier.35670030CDSMerle T.Jorissen A.Masseron T.Van Eck S.Siess L.Van Winckel H.2017-06-29T08:55:50Z2014-07-08T08:10:31ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starschemical-abundancesspectroscopyWe determine the orbital elements for the K0 IV + white dwarf (WD) system IP Eri, which appears to have a surprisingly long period of 1071d and a significant eccentricity of 0.25. Previous spectroscopic analyses of the WD, based on a distance of 101pc inferred from its Hipparcos parallax, yielded a mass of only 0.43M_{sun}_, implying it to be a helium-core WD. The orbital properties of IP~Eri are similar to those of the newly discovered long-period subdwarf B star (sdB) binaries, which involve stars with He-burning cores surrounded by extremely thin H envelopes, and are therefore close relatives to He WDs. We performed a spectroscopic analysis of high-resolution spectra from the HERMES/Mercator spectrograph and concluded that the atmospheric parameters of the K0 component are Teff=4960K, logg=3.3, [Fe/H]=0.09 and vt=1.5km/s. The detailed abundance analysis focuses on C, N, O abundances, carbon isotopic ratio, light (Na, Mg, Al, Si, Ca, Ti) and s-process (Sr, Y, Zr, Ba, La, Ce, Nd) elements. We conclude that IP~Eri abundances agree with those of normal field stars of the same metallicity. The long period and non-null eccentricity indicate that this system cannot be the end product of a common-envelope phase; it calls instead for another less catastrophic binary-evolution channel presented in detail in a companion paper.2014A&A...567A..30Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/567/A30CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/567/A30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/567/A30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/567/A30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/567/A30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/567/A30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/567/A30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/567/A30OpticaldefaultJ/A+A/567/A30/listList of FITS spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlam.minLower value of wavelength interval0.1nmem.wlfloatlam.maxUpper value of wavelength interval0.1nmem.wlfloatdlambdaWavelength resolution0.1nmspect.resolutiondoubleNxNumber of linesmeta.numberintsize[2661] Size of FITS fileKibytephys.size;meta.fitsintBJDBarycentric date of mid-observationdtime.epochdoublespShow the spectrummeta.ref.urlcharfitsDownload the FITS filemeta.ref.urlcharFileNameName of the file containing the spectrum in subdirectory spmeta.id;meta.filecharTitleTitle of the filemeta.notechar