J/A+A/628/A106ivo://CDS.VizieR/J/A+A/628/A106doi:10.26093/cds/vizier.36280106CDSBonanno A.Corsaro E.Del Sordo F.Palle P.L.Stello D.Hon M.2019-11-22T14:36:17Z2019-08-14T06:55:52ZCDS support team

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

cds-question@unistra.frgiant-starsvariable-starsradial-velocitymagnetic-fieldsWe present further evidence of acoustic oscillations in the slowly rotating overactive G8 sub-giant EK Eri. This star was observed with the 1m Hertzsprung SONG telescope at the Observatorio del Teide for two different runs of 8 and 13 nights, respectively, that were separated by about a year. We determined a significant excess of power around {nu}_max_=253+/-3uHz in the first observing run and were able to determine a large separation, {Delta}_{nu}_=16.430+/-22uHz. No significant excess of power was instead detected in a subsequent SONG observing season, as also supported by our analysis of the simultaneous TESS photometric observations. We propose a new amplitude-luminosity relation in order to account for the missing power in the power spectrum. Based on the evolutionary stage of this object, we argue that a standard {alpha}^2^{OMEGA} dynamo cannot be excluded as the possible origin for the observed magnetic field.2019A&A...628A.106Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/628/A106CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/628/A106https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/628/A106http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/628/A106https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/628/A106https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/628/A106http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/628/A106GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/628/A106/table1Radial velocities of EK Eridani for 2017recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleBRVBarycentric corrected radial velocity (1)m/sphys.veloc;pos.barycenterdoublee_BRVUncertainty on RV (2)m/sstat.errordoubleJ/A+A/628/A106/table2Radial velocities of EK Eridani for 2018recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdoubleBRVBarycentric corrected radial velocity (1)m/sphys.veloc;pos.barycenterdoublee_BRVUncertainty on RV (2)m/sstat.errordouble