J/AcA/72/31ivo://CDS.VizieR/J/AcA/72/31doi:10.26093/cds/vizier.120720031CDSSenavci H.V.Ceki A.Esmer E.M.Yalcinkaya S.Latkovic O.Bahar E.,Yilmaz M.Basturk O.Ozavci I.Yorukoglu O.Selam S.O.2025-09-25T20:16:55Z2022-06-29T15:07:25ZCDS support team

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

cds-question@unistra.frmultiple-starsradial-velocityphotometryvisible-astronomyIn this study, we present spectroscopic observations of the eclipsing binary RR Dra carried out with our recently installed T80 telescope in Ankara University Kreiken Observatory and analyze the first radial velocity time series of this system. We simultaneously model TESS light curves along with our radial velocity data to derive absolute parameters of RR Dra system. Additionally, we investigate the period variation of the system using all the available eclipse timings in the literature. In this context, we discuss two possible explanations for the cyclic nature of the eclipse timings: i) light-time effect that corresponds to a high-mass but unseen additional component, ii) magnetic activity of the cooler component. The secular period increase in eclipse timings of RR Dra may be a combination of mass transfer and angular momentum loss, amplified by the presence of circumstellar material.2022AcA....72...31Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AcA/72/31CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AcA/72/31https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AcA/72/31http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AcA/72/31https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AcA/72/31https://vizier.iucaa.in/viz-bin/votable?-source=J/AcA/72/31http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AcA/72/31GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AcA/72/31/rvRR Dra radial velocity valuesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDMid-exposure time in Heliocentric Julian Daysdtime.epochdoubleRV1Radial velocity of the primary componentkm/sspect.dopplerVelocfloate_RV1Error of the radial velocity measurement for the primary componentkm/sstat.errorfloatRV2Radial velocity of the secondary componentkm/sspect.dopplerVelocdoublee_RV2Error of the radial velocity measurement for the secondary componentkm/sstat.errorfloatJ/AcA/72/31/eclipseRR Dra mid eclipse timesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDMid-eclipse time in Heliocentric Julian Daysdtime.epochdoubleType[1/2] Type of the eclipse (1 - primary, 2 - secondary)meta.codeintFilterPassband of Observationsinstr.bandpass;obschare_HJDMid-eclipse time errorsdstat.error;time.epochdouble