J/ApJ/828/47ivo://CDS.VizieR/J/ApJ/828/47doi:10.26093/cds/vizier.18280047CDSPeters G.J.Wang L.Gies D.R.Grundstrom E.D.2017-06-22T14:28:48Z2017-01-13T12:17:29ZCDS support team

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

cds-question@unistra.frradial-velocitybe-starsspectroscopic-binary-starsspectroscopyultraviolet-astronomyWe present a spectroscopic investigation of the Be+sdO binary system HR 2142 that is based upon large sets of ultraviolet observations from the International Ultraviolet Explorer (IUE) and ground-based H{alpha} observations. We measured radial velocities for the Be star component from these spectra and computed a revised orbit. In order to search for the spectral signature of the hot subdwarf, we cross-correlated the short wavelength end of each IUE spectrum with a model hot star spectrum, and then we used the predicted Doppler shifts of the subdwarf to shift-and-add all the cross-correlation functions to the frame of the subdwarf. This merged function shows the weak signal from the spectral lines of the hot star, and a best fit is obtained with a mass ratio M_2_/M_1_=0.07+/-0.02, companion temperature T_eff_>=43+/-5kK, projected rotational velocity Vsini<30km/s, and a monochromatic flux ratio near 1170{AA} of f_2_/f_1_>0.009+/-0.001. This hot subdwarf creates a one-armed spiral, tidal wake in the disk of the Be star, and we present a circumbinary disk model that can explain the occurrence of shell absorption lines by gas enhancements that occur where gas crossing the gap created by the subdwarf strikes the disk boundaries. The faint companion of HR 2142 may be representative of a significant fraction of Be stars with undetected former mass donor companion stars.2016ApJ...828...47Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/828/47CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/254 : Radial Velocities with Astrometric Data. II. (Kharchenko+, 2007)III/244 : Catalog of Stellar Rotational Velocities (Glebocki+ 2005)J/A+A/595/A132 : Be star rotational velocities distribution (Zorec+, 2016)J/A+A/546/A61 : Radial velocities for XHIP catalogue (de Bruijne+, 2012)J/A+A/440/305 : Fundamental param. of fast-rotating B stars (Fremat+, 2005)J/ApJ/616/562 : Rotational velocities in binaries (Abt+, 2004)J/ApJ/573/359 : Rotational velocities of B stars from BSC (Abt+, 2002)J/A+A/368/912 : Polarization & rotational velocities of Be stars (Yudin, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/828/47https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/828/47http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/828/47https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/828/47https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/828/47http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/828/47GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalUVdefaultJ/ApJ/828/47/table1Spectroscopic observations of HR 2142SourceTelescope/Instrument/Satellite usedmeta.id;instrcharl_R1Limit flag on R1meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/5] Observation Codemeta.idintNsp[8/88] Number of spectrameta.numberintR1Spectral resolving power, {lambda}/{Delta}{lambda} or lower range of R if R2 existsspect.resolutionintR2? Upper range of spectral resolving power, {lambda}/{Delta}{lambda}spect.resolutionintnullablelam1[1150/6563] Lower range of wavelength, in Angstrom0.1nmem.wlintlam2[1950/7140]? Upper range of wavelength, in Angstrom0.1nmem.wlintnullableu_lam1Uncertainty flag in lam1meta.code.errorcharDate1Date of first observation in Besselian yearyrtime.epochintDate2Date of last observation in Besselian yearyrtime.epochintObsObserver(s)obs.observercharJ/ApJ/828/47/table2Be star radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDObservation date, HJD-2400000dtime.epochdoublef_HJD[d] d=Discrepant datum flag (1)meta.codecharPhaseOrbital Phasetime.phasefloatHRV[22.8/65.8] Heliocentric Radial Velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.5/36] Uncertainty in HRV, {sigma}km/sstat.errorfloatO-C[-19.1/16.8] O-C residualkm/sstat.fit.residual;stat.fit.omcfloatObsID[1/55943] Source (2)meta.id;obsint