J/ApJ/836/112ivo://CDS.VizieR/J/ApJ/836/112doi:10.26093/cds/vizier.18360112CDSDulaney N.A.Richardson N.D.Gerhartz C.J.Bjorkman J.E.Bjorkman K.S.,Carciofi A.C.Klement R.Wang L.Morrison N.D.Bratcher A.D.,Greco J.J.Hardegree-Ullman K.K.Lembryk L.Oswald W.L.Trucks J.L.2017-11-13T13:09:04Z2017-10-19T07:18:21ZCDS support team

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

cds-question@unistra.frbe-starsmultiple-starslate-type-starsradial-velocityspectroscopyThe late-type Be star {beta} CMi is remarkably stable compared to other Be stars that have been studied. This has led to a realistic model of the outflowing Be disk by Klement+ (2015A&A...584A..85K). These results showed that the disk is likely truncated at a finite radius from the star, which Klement et al. suggest is evidence for an unseen binary companion in orbit. Here we report on an analysis of the Ritter Observatory spectroscopic archive of {beta} CMi to search for evidence of the elusive companion. We detect periodic Doppler shifts in the wings of the H{alpha} line with a period of 170 days and an amplitude of 2.25km/s, consistent with a low-mass binary companion (M~0.42M_{sun}_). We then compared small changes in the violet-to-red peak height changes (V/R) with the orbital motion. We find weak evidence that it does follow the orbital motion, as suggested by recent Be binary models by Panoglou et al. Our results, which are similar to those for several other Be stars, suggest that {beta} CMi may be a product of binary evolution where Roche lobe overflow has spun up the current Be star, likely leaving a hot subdwarf or white dwarf in orbit around the star. Unfortunately, no direct sign of this companion star is found in the very limited archive of International Ultraviolet Explorer spectra.2017ApJ...836..112Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/836/112CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/254 : 2nd Cat. of RVs with Astrometric Data (Kharchenko+, 2007)J/ApJS/161/118 : byH{alpha} photometry in open clusters (McSwain+, 2005)J/ApJ/682/L117 : A spectroscopic orbit for Regulus (Gies+, 2008)J/ApJ/686/1280 : Discovery of hot subdwarf companion to FY CMa (Peters+, 2008)J/A+A/545/A121 : {omicron} Puppis spectra (Koubsky+, 2012)J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)J/A+A/540/A53 : {gamma} Cas radial velocity curve (Smith+, 2012)J/ApJ/765/2 : FUV radial velocities of 59 Cyg (Peters+, 2013)J/ApJ/828/47 : Radial velocities of the Be star HR 2142 (Peters+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/836/112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/836/112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/836/112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/836/112https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/836/112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/836/112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/836/112/table1H{alpha} measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date; JD-2450000dtime.epochdoubleRV[-5.5/9.4]? Differential radial velocities, H{alpha} line (1)km/sphys.veloc;arith.difffloatnullablee_RV[0.4/5]? Uncertainty in RVkm/sstat.errorfloatnullableV/R[0.9/1.1] Violet-to-red peak height changes (2)spect.line.intensity;arith.ratiofloate_V/R[0.006/0.05] Uncertainty in V/Rstat.errorfloat