J/ApJ/789/10ivo://CDS.VizieR/J/ApJ/789/10doi:10.26093/cds/vizier.17890010CDSNeugent K.F.Massey P.2017-12-15T10:54:40Z2017-03-15T14:29:56ZCDS support team

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

cds-question@unistra.frgalaxieswolf-rayet-starsapparent-magnitudeMassive star evolutionary models generally predict the correct ratio of WC-type and WN-type Wolf-Rayet stars at low metallicities, but underestimate the ratio at higher (solar and above) metallicities. One possible explanation for this failure is perhaps single-star models are not sufficient and Roche-lobe overflow in close binaries is necessary to produce the "extra" WC stars at higher metallicities. However, this would require the frequency of close massive binaries to be metallicity dependent. Here we test this hypothesis by searching for close Wolf-Rayet binaries in the high metallicity environments of M31 and the center of M33 as well as in the lower metallicity environments of the middle and outer regions of M33. After identifying ~100 Wolf-Rayet binaries based on radial velocity variations, we conclude that the close binary frequency of Wolf-Rayets is not metallicity dependent and thus other factors must be responsible for the overabundance of WC stars at high metallicities. However, our initial identifications and observations of these close binaries have already been put to good use as we are currently observing additional epochs for eventual orbit and mass determinations.2014ApJ...789...10Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/789/10CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/505/793 : New WR star in M33 (Massey+, 1998)J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)J/AJ/133/2393 : UBVRI phot. in seven Local Group dwarfs galaxiesJ/ApJ/733/123 : The Wolf-Rayet content of M33 (NGC 598) (Neugent+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/789/10https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/789/10http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/789/10https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/789/10https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/789/10http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/789/10GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/789/10/table2 (Newly Found M33 WR and Of-type Stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/789/10/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/789/10/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/789/10/table2?GETtext/xml+votable180.050000true23.26137530.19211110.005555555555555556Cone search capability for table J/ApJ/789/10/table3 (E/I Values for the 250 observed candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/789/10/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/789/10/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/789/10/table3?GETtext/xml+votable180.050000true11.04545841.2730560.0055555555555555566/2154 2155 2240 2241 2622 2623 2666 2708 2709 27523.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/789/10?format=asciidefaultJ/ApJ/789/10/table2Newly Found M33 WR and Of-type StarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar ([NM2011] JHHMMSS.ss+DDMMSS.s in Simbad)meta.idcharrhoDistance from the center within the plane of M33 normalized to D25 (1)pos.angDistancefloatTypeType of starsrc.classcharlog(-EW)HeII? Log(-EW) of He II lambda4686log(0.1nm)spect.line.widthfloatnullableFWHMHeII? FWHM of He II lambda46860.1nmspect.line.widthintnullablelog(-EW)CIV? Log(-EW) of C IV lambda5606log(0.1nm)spect.line.widthfloatnullableFWHMCIV? FWHM of C IV lambda56060.1nmspect.line.widthintnullableVmagV-band magnitude (2)magphot.mag;em.opt.Vfloatm4750lambda4750 {AA} AB magnitude (3)magphot.mag;em.optfloatVMagV-band Absolute magnitudes (4)magphot.mag;em.opt.VfloatM4750lambda4750 {AA} Absolute magnitudes (4)magphys.magAbsfloatOBassocOB association (5)meta.id.parentcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/789/10/table3E/I Values for the 250 observed candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar name (JHHMMSS.ss+DDMMss)meta.id;meta.maincharWaveWavelength; Angstroms0.1nmem.wlintE/IfxcorExternal scatter to internal error ratio from fxcorstat.errorfloatE/IhandExternal scatter to internal error ratio by handstat.errorfloatNumNumber of lines usedmeta.numberint_RApositions from name (right ascension part)degpos.eq.ra;meta.main_DEpositions from name (declination part)degpos.eq.dec;meta.main