J/AJ/149/125ivo://CDS.VizieR/J/AJ/149/125doi:10.26093/cds/vizier.51490125CDSOlson E.C.Etzel P.B.2017-07-10T06:21:58Z2015-05-13T07:01:24ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsphotometryradial-velocityWe obtained full-orbit Iybvu intermediate-band photometry and CCD spectroscopy of the long-period Algol eclipsing binary RX Geminorum. Photometric solutions using the Wilson-Devinney code give a gainer rotation (hotter, mass-accreting component) about 15 times the synchronous rate. We describe a simple technique to detect departures from uniform rotation of the hotter component. These binaries radiate double-peaked H{alpha} emission from a low-mass accretion disk around the gainer. We used an approximate non-LTE disk code to predict models in fair agreement with observations, except in the far wings of the emission profile, where the star-inner disk boundary layer emits extra radiation. Variations in H{alpha} emission derive from modulations in the transfer rate. A study of times of minima during the 20th century suggests that a perturbing third body is present near RX Gem.2015AJ....149..125Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/125CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)J/AJ/138/1435 : Photometric observations of UX Monocerotis (Olson+, 2009)J/AJ/109/1308 : H-alpha Emission Variations (Olson+ 1995)J/AJ/109/1269 : Streams and Disks in Binary Stars (Etzel+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/125https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/125http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/125https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/125https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/125http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/125GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/149/125/table6Star 2 (donor) radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date (HJD-2451000)dtime.epochdoublePhase[0/1] Phasetime.epochdoubleHRV[-93/145] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricintJ/AJ/149/125/table7(O-C)s for RX GemMJDModified Julian Date of observation (HJD-2440000)dtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintO-CL[-0.1/0.1] Linear fit (O-C) residual (1)dstat.fit.residualfloatO-CS[-0.03/0.03] Sine fit (O-C) residualdstat.fit.residualfloatCycle[0/2812] Cycle numbermeta.id;meta.mainintRefReferencemeta.ref;pos.framecharJ/AJ/149/125/table1Iybvu observations of RX GeminorumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFltFilter used (I, y, b, v, u)instr.setup;instr.filtercharHJDHeliocentric Julian Date (HJD-2400000)dtime.epochdoubleDmag[0.25/3.32] Differential magnitude in Filtermagphot.mag;arith.difffloat