J/A+A/551/A2ivo://CDS.VizieR/J/A+A/551/A2doi:10.26093/cds/vizier.35510002CDSKovari Zs.Korhonen H.Strassmeier K.GWeber M.Kriskovics L.,Savanov I.2017-07-11T13:09:17Z2013-02-07T09:22:29ZCDS support team

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

cds-question@unistra.frlate-type-starsphotometryspectroscopyWe present the first Doppler imaging study of the two rapidly rotating, single K-giants DP CVn and DI Psc in order to study the surface spot configuration and to pinpoint their stellar evolutionary status. Optical spectroscopy and photometry are used to determine the fundamental astrophysical properties. Doppler imaging is applied to recover the surface temperature distribution for both stars, while photometric light-curve inversions are carried out for studying the long-term changes of the surface activity of DP CVn. Surface differential rotation of DP CVn is estimated from cross-correlating the available subsequent Doppler reconstructions separated by roughly one rotation period. Both stars appear to have higher than normal lithium abundance, LTE logn of 2.28 (DP CVn) and 2.20 (DI Psc), and are supposed to be located at the end of the first Li dredge-up on the RGB. Photometric observations reveal rotational modulation with a period of 14.010d (DP CVn) and 18.066d (DI Psc). Doppler reconstructions from the available mapping lines well agree in the revealed spot patterns, recovering rather low latitude spots for both stars with temperature contrasts of {DELTA}T~600-800K below the unspotted photospheric background. Spots at higher latitudes are also found but either with less contrast (DP CVn) or with smaller extent (DI Psc). A preliminary antisolar-type differential rotation with {alpha}=-0.035 is found for DP CVn from cross-correlating the subsequent Doppler images. Long-term photometric analysis supports the existence of active longitudes, as well as the differential rotation.2013A&A...551A...2Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/551/A2CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/551/A2https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/551/A2http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/551/A2https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/551/A2https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/551/A2http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/551/A2GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/551/A2/DP_CVnObservations of DP CVnrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Daydtime.epoch;pos.heliocentricdoubleDmagDifferential magnitude in Filtermagphot.mag;arith.diffdoublee_DmagError in Dmagmagstat.error;phot.mag;arith.diffdoubleFilt[bivy] Filter (1)meta.id;instr.filtercharJ/A+A/551/A2/DI_PscObservations of DI PscrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Daydtime.epoch;pos.heliocentricdoubleDmagDifferential magnitude in Filtermagphot.mag;arith.diffdoublee_DmagError in Dmagmagstat.error;phot.mag;arith.diffdoubleFilt[bivy] Filter (1)meta.id;instr.filterchar