J/ApJ/686/1280ivo://CDS.VizieR/J/ApJ/686/1280doi:10.26093/cds/vizier.16861280CDSPeters G.J.Gies D.R.Grundstrom E.D.McSwain M.V.2017-06-29T08:55:55Z2011-01-12T12:53:40ZCDS support team

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

cds-question@unistra.frbe-starsspectroscopic-binary-starssubdwarf-starsspectroscopyultraviolet-astronomyradial-velocityline-intensitiesThe rapid rotation of Be stars may be caused in some cases by past mass and angular momentum accretion in an interacting binary in which the mass donor is currently viewed as a small, hot subdwarf stripped of its outer envelope. Here we report on the spectroscopic detection of such a subdwarf in the Be binary system FY Canis Majoris from the analysis of data acquired by the IUE spacecraft and KPNO Coude Feed Telescope over the course of 16 and 21yr, respectively. We present a double-lined spectroscopic orbit for the binary based on radial velocities from the IUE spectra and use the orbital solutions with a Doppler tomography algorithm to reconstruct the components' UV spectra. The subdwarf is hot (T_eff_=45+/-5kK) and has a mass of about 1.3M_{sun}_ and a radius of about 0.6R_{sun}_. It contributes about 4% as much flux as the Be star does in the FUV. We also present observations of the H{alpha} and HeI{lambda}6678 emission features that are formed in the circumstellar disk of the Be star.2008ApJ...686.1280Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/686/1280CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/686/1280https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/686/1280http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/686/1280https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/686/1280https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/686/1280http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/686/1280GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticaldefaultJ/ApJ/686/1280/table5Red spectra measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateHJDdtime.epochdoublePhaseOrbital phase from Be star superior conjunctiontime.phasefloatEWH{alpha} equivalent width in Angstroms0.1nmspect.line.eqWidth;em.line.HalphafloatHRV(Ha)Heliocentric radial velocity H{alpha} wings (1)km/sspect.dopplerVelocfloatHRV(He)? Heliocentric velocity of HeI peaks (6678{AA})km/sspect.dopplerVelocintnullableDRV(He)? HeI peak velocity separationkm/sphys.veloc;arith.diffintnullableJ/ApJ/686/1280/table2IUE radial velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateHJDdtime.epochdoubleObsDateObservation date UTtime.epoch;obsnullableSWPIUE Short-Wavelength Prime (SWP) numbermeta.id;obsintPhaseOrbital phase from Be star superior conjunctiontime.phasefloatHRV1Heliocentric radial velocity for Be starkm/sspect.dopplerVeloc;pos.heliocentricfloatO-C1Observed minus calculated velocity for Be starkm/sphys.velocfloatHRV2? Heliocentric radial velocity for subdwarfkm/sspect.dopplerVeloc;pos.heliocentricfloatnullableO-C2? Observed minus calculated velocity for subdwarfkm/sphys.velocfloatnullable