J/A+A/334/863ivo://CDS.VizieR/J/A+A/334/863doi:10.26093/cds/vizier.33340863CDSBerdyugina S.V.Jankov S.Ilyin I.Tuominen I.Fekel F.C.1998-07-05T15:38:22Z1998-07-05T15:16:38ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsradial-velocityA detailed model atmosphere analysis of high-resolution and high S/N CCD spectra of IIPeg has yielded for the first time a self-consistent set of fundamental parameters of the primary component: T_eff_=4600K, logg=3.2, [M/H]=-0.4, {xi}_t_=2.0km/s. In addition, 121 new high quality radial velocity measurements allowed us to determine improved orbital parameters, resulting in a new orbital ephemeris of T_conj_=2449582.9268+6.724333E. The position of the primary of II Peg in the HR diagram with the new parameters corresponds to a K2 IV star with mass =~0.8M_{sun}_. The evolved character of the star is confirmed by the C/N ratio, which is reduced significantly relative to the solar value. The unspotted V magnitude of the star of 6.9mag is estimated from the observed variations of the TiO bands and quasi-simultaneous photometry. The blend of LiI 6707{AA} is suspected to vary in equivalent width due to spot modulation. The lithium abundance for the unspotted star, Li/H=1.0+/-0.1, is found to be consistent with other post-main sequence chromospherically active stars. Combining all parameters, the radius R=~3.4R_{sun}_ and the inclination i=~60{deg} of the primary are estimated with the assumption that its rotational axis is perpendicular to the orbital plane. The secondary is probably a M0-M3 V star with a mass of about 0.4M_{sun}_.1998A&A...334..863Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/334/863CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/334/863https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/334/863http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/334/863https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/334/863https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/334/863http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/334/863GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/334/863/table2Radial velocity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatr_RV[1/9] Reference for radial velocity (1)meta.refint