J/ApJS/213/34ivo://CDS.VizieR/J/ApJS/213/34doi:10.26093/cds/vizier.22130034CDSKobulnicky H.A.Kiminki D.C.Lundquist M.J.Burke J.Chapman J.,Keller E.Lester K.Rolen E.K.Topel E.Bhattacharjee A.Smullen R.A.,Vargas Alvarez C.A.Runnoe J.C.Dale D.A.Brotherton M.M.2017-11-28T13:21:38Z2014-10-08T14:09:44ZCDS support team

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

cds-question@unistra.frmultiple-starsradial-velocitystellar-spectral-typesspectroscopic-binary-starssurveysWe analyze orbital solutions for 48 massive multiple-star systems in the Cygnus OB2 association, 23 of which are newly presented here, to find that the observed distribution of orbital periods is approximately uniform in log P for P<45days, but it is not scale-free. Inflections in the cumulative distribution near 6days, 14days, and 45days suggest key physical scales of =~0.2, =~0.4, and =~1A.U. where yet-to-be-identified phenomena create distinct features. No single power law provides a statistically compelling prescription, but if features are ignored, a power law with exponent {beta}=~-0.22 provides a crude approximation over P=1.4-2000days, as does a piece-wise linear function with a break near 45days. The cumulative period distribution flattens at P>45days, even after correction for completeness, indicating either a lower binary fraction or a shift toward low-mass companions. A high degree of similarity (91% likelihood) between the Cyg OB2 period distribution and that of other surveys suggests that the binary properties at P<~25days are determined by local physics of disk/clump fragmentation and are relatively insensitive to environmental and evolutionary factors. Fully 30% of the unbiased parent sample is a binary with period P<45days. Completeness corrections imply a binary fraction near 55% for P<5000days. The observed distribution of mass ratios 0.2<q<1 is consistent with uniform, while the observed distribution of eccentricities 0.1<e<0.6 is consistent with uniform plus an excess of e=~0 systems. We identify six stars, all supergiants, that exhibit aperiodic velocity variations of ~30km/s attributed to atmospheric fluctuations.2014ApJS..213...34Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/213/34CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)J/A+A/550/A107 : RV catalogue of O stars in 30 Doradus (Sana+, 2013)J/A+A/543/A101 : OB stars in Cygnus OB2 association (Comeron+, 2012)J/MNRAS/424/1925 : Spectrocopic Binarity of O and B type stars (Chini+, 2012)J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)J/ApJ/751/4 : Paper V. RVs of massive stars in Cyg OB2 (Kiminki+, 2012)J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009)J/A+A/479/541 : VLT-FLAMES survey of massive stars (Hunter+, 2008)J/MNRAS/386/447 : RV catalogue of O-type stars in NGC 6231 (Sana+, 2008)J/ApJ/664/1102 : Paper I. RV survey of Cyg OB2 association (Kiminki+, 2007)J/MNRAS/298/753 : Variables in Cygnus OB2 (Pigulski+ 1998)J/AJ/101/1408 : Massive stars in Cyg OB2. (Massey+ 1991)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/213/34https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/213/34http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/213/34https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/213/34https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/213/34http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/213/34GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/213/34/table8 (OB binaries in Cyg OB2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/213/34/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/213/34/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/213/34/table8?GETtext/xml+votable180.050000true307.711420841.5851750.005555555555555556Cone search capability for table J/ApJS/213/34/apvar (O-star sample exhibiting irregular velocity variations (table added by CDS following Section 3.2 data))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/213/34/apvar?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/213/34/apvar?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/213/34/apvar?GETtext/xml+votable180.050000true307.93917541.30743060.0055555555555555566/14692 14693 14694https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/213/34?format=asciiOpticaldefaultJ/ApJS/213/34/table8OB binaries in Cyg OB2SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharprimarym_ID[c12] Component identifiermeta.code.multipcharID2Other identifier (S=Schulte)meta.idcharTypeSpectroscopic binary type (1)meta.code;src.varcharSpTMK spectral types for the componentssrc.spTypecharPer[1.4/4996] Orbital perioddtime.perioddoublee_Per[0/330]? Per uncertaintydstat.errordoublenullablef_Per[fy] f=fixed; y=6.19yrmeta.codecharK1[3.4/257]? Primary semi-amplitudekm/sphys.veloc;src.orbitalfloatnullablee_K1[0.3/15]? K1 uncertaintykm/sstat.errorfloatnullablee[0/0.75]? Eccentricitysrc.orbital.eccentricityfloatnullablee_e[0.01/0.3]? e uncertaintystat.errorfloatnullablef_e[f] f=fixed eccentricitymeta.codecharq1[0/1] Mass ratio (q=M2/M1): lower limit (2)phys.mass;arith.ratiofloatn_q2[~:f +/-] How to interpret q2 (2)meta.notecharq2[0/1]? Mass ratio (q=M2/M1): upper limit or errorphys.mass;arith.ratiofloatnullableRefReference(s) to published orbital solutions (3)meta.refcharNote[a-f,? ] Additional note(s) (4)meta.notecharNvNumber of RV measures in table ephemmeta.numberintnullableVPVelocity Plotmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJS/213/34/ephemEphemerides for new binary systems (table 1) and reanalysis from Papers II and III (table 9)IDSource identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_IDSimbad column added by the CDSmeta.codecharm_ID[ab c12] Component identifiermeta.code.multipcharHJDHeliocentric Julian Date; HJD-2400000dtime.epochdoublePhaseOrbital phasetime.phasefloatRVel[-220/197] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RVel[1.1/32] The 1{sigma} uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatO-C[-47/47] The observed-minus-computed velocitykm/sstat.fit.residualfloatJ/ApJS/213/34/table7Velocities of stars showing aperiodic variationsIDSource identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_ID[a] Flag on ID (1)meta.codecharHJDHeliocentric Julian Date; HJD-2400000dtime.epochdoubleRVel[-37.1/18] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RVel[1.3/11.5] The 1{sigma} uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatJ/ApJS/213/34/apvarO-star sample exhibiting irregular velocity variations (table added by CDS following Section 3.2 data)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharprimaryID2Other identifier (S=Schulte)meta.idcharSpTMK spectral typesrc.spTypecharNvNumber of RV measures in table 7meta.numberintnullableVPVelocity Plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main