J/AJ/151/106ivo://CDS.VizieR/J/AJ/151/106doi:10.26093/cds/vizier.51510106CDSLee B.-C.Han I.Park M.-G.Mkrtichian D.E.Hatzes A.P.Jeong G.,Kim K.-M.2017-06-19T07:58:06Z2016-07-20T06:54:50ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsm-starsgiant-starsradial-velocityWe report that the spectroscopic binary {mu} Ursae Majoris ({mu} UMa) has secondary RV variations of 471.2 days in addition to those of 230.0 days already known. Keplerian orbit analysis yields stellar mass companions of 1.6M_{sun}_ for the 230 day period and 0.14M_{sun}_for the 471 day period. However, the HIPPARCOS photometries show a period similar to the stellar rotational period, which is one-quarter of the RV period. Variations in the bisector velocity curvature show a period of 463.6 days. We also find ~473 day variations in the equivalent width (EW) measurements of the H_{alpha}_ and H_{beta}_ lines, whose origin is probably stellar activity. We note that the nature of 471 day variations is similar to one observed in "Sequence D" of Asymptotic Giant Branch pulsating stars. We therefore conclude that the RV and the EW variations in the spectroscopic binary M giant {mu} UMa A originate from the complex pulsations and the chromospheric activity.2016AJ....151..106Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/151/106CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)J/AJ/135/209 : Rotational and radial velocities 761 HIP giantshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/151/106https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/151/106http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/151/106https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/151/106https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/151/106http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/151/106GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/151/106/table2Radial velocity (RV) measurements for {mu} UMa from 2006 November to 2014 NovemberrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date (JD-2450000)dtime.epochdoubleRV[-6.1/9.8] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[4.9/13] 1{sigma} uncertainty in RVm/sstat.errorfloat