J/ApJ/811/85ivo://CDS.VizieR/J/ApJ/811/85doi:10.26093/cds/vizier.18110085CDSKiminki D.C.Kobulnicky H.A.Vargas Alvarez C.A.Alexander M.J.,Lundquist M.J.2017-06-20T13:16:53Z2016-01-28T09:07:03ZCDS support team

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

cds-question@unistra.frradial-velocityvisible-astronomybroad-band-photometryspectroscopic-binary-starsThe Cygnus OB2 Association is one of the nearest and largest collections of massive stars in the Galaxy. Situated at the heart of the "Cygnus X" complex of star-forming regions and molecular clouds, its distance has proven elusive owing to the ambiguous nature of kinematic distances along this l~=80{deg} sightline and the heavy, patchy extinction. In an effort to refine the three-dimensional geometry of key Cygnus X constituents, we have measured distances to four eclipsing double-lined OB-type spectroscopic binaries that are probable members of Cyg OB2. We find distances of 1.33+/-0.17, 1.32+/-0.07, 1.44+/-0.18, and 1.32+/-0.13kpc toward MT91 372, MT91 696, CPR2002 A36, and Schulte 3, respectively. We adopt a weighted average distance of 1.33+/-0.06kpc. This agrees well with spectrophotometric estimates for the Association as a whole and with parallax measurements of protostellar masers in the surrounding interstellar clouds, thereby linking the ongoing star formation in these clouds with Cyg OB2. We also identify Schulte 3C (O9.5V), a 4" visual companion to the 4.75 day binary Schulte 3(A+B), as a previously unrecognized Association member.2015ApJ...811...85Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/811/85CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)III/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)J/MNRAS/449/741 : The massive star population of Cygnus OB2 (Wright+, 2015)J/ApJS/213/34 : Velocities of Cygnus OB2 massive binaries (Kobulnicky+, 2014)J/AJ/145/125 : Spectroscopy & HST photometry in Westerlund 2 (Vargas+, 2013)J/AJ/145/9 : BVRI LCs of the early-type binary V382 Cyg (Yasarsoy+, 2013)J/A+A/543/A101 : OB stars in Cygnus OB2 association (Comeron+, 2012)J/ApJ/751/4 : RVs of massive stars in Cyg OB2 (Kiminki+, 2012)J/ApJ/720/679 : Optical spectroscopy in Cygnus X region (Beerer+, 2010)J/ApJ/713/871 : Sources in region Cyg-OB2 from X-ray (Wright+, 201)J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009)J/A+A/495/231 : Multiwavelength study of Cyg OB2 5 (Linder+, 2009)J/A+A/476/1243 : Millimeter continuum mapping of Cygnus X (Motte+, 2007)J/ApJ/664/1102 : RV survey of Cyg OB2 association (Kiminki+, 2007)J/ApJ/663/320 : IR-through-UV extinction curve (Fitzpatrick+, 2007)J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)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/ApJ/811/85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/811/85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/811/85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/811/85https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/811/85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/811/85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/811/85/table7 (Joint light and velocity curve analysis for MT91 372, MT91 696, CPR2002 A36, and Schulte 3)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/811/85/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/811/85/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/811/85/table7?GETtext/xml+votable180.050000true308.245541.0750.0055555555555555566/14692 14693https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/811/85?format=asciiOpticaldefaultJ/ApJ/811/85/table5V-band Photometry of Schulte 3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date; HJD-2400000.0dtime.epochdoubleVmag[10.1/10.5] The V band magnitude (1)magphot.mag;em.opt.Vfloate_Vmag[0.001/0.03] The 1{sigma} uncertainty in Vmag (G1)magstat.error;phot.mag;em.opt.VfloatJ/ApJ/811/85/table7Joint light and velocity curve analysis for MT91 372, MT91 696, CPR2002 A36, and Schulte 3SimbadNameSimbad column added by the CDSmeta.idcharf_eccf: fixedmeta.codecharVMag[-6.3/-2.7] Absolute V-band magnitudemagphot.mag;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar designationmeta.id;meta.maincharVCVelocity plotmeta.ref.urlcharPer[1.4/4.8] orbital perioddtime.perioddoublee_Per[0/0.0006] Period uncertaintydstat.errordoubleT0[53996/56101] Date of periastrondphys.temperaturedoublee_T0[0.0005/0.2] T0 uncertaintydstat.errorfloatecc[0/0.05] Eccentricitysrc.orbital.eccentricityfloate_ecc[0.002]? ecc uncertaintystat.errorfloatnullablea[16.3/38.7] Semimajor axissolRadphys.angSize.smajAxisfloate_a[0.2/0.9] a uncertaintysolRadstat.errorfloatq[0.4/0.8] Mass ratiophys.massfloate_q[0.01/0.03] q uncertaintystat.errorfloatV0[-47/1.1] Systemic velocity ({gamma})km/sphys.velocfloate_V0[2/3] V0 uncertaintykm/sstat.error;pos.cartesian.yfloatinc[59.2/86.5] Orbital inclinationdegsrc.orbital.inclinationfloate_inc[0.3/1.5] inc uncertaintydegstat.errorfloat3l[12/14]? third light contribution%stat.fit.paramintnullablef_3lf: fixedmeta.codecharloggP[3.3/4.2] Log of surface gravity (P)log(cm.s**-2)phys.gravityfloatloggS[3.3/4.1] Log of surface gravity (S)log(cm.s**-2)phys.gravityfloatT1[24000/38500] Primary temperatureKphys.temperatureinte_T1[600/3000]? T1 uncertaintyKstat.errorintnullableT2[16600/31300] Secondary temperatureKphys.temperatureinte_T2[600/2300] T2 uncertaintyKstat.errorintR1[4.9/16.5] Primary radiussolRadphys.size.radiusfloate_R1[0.03/0.1] R1 uncertaintysolRadstat.errorfloatR2[3.3/13.1] Secondary radiussolRadphys.size.radiusfloate_R2[0.02/0.1] R2 uncertaintysolRadstat.errorfloatM1[13/22] Primary masssolMassphys.massfloate_M1[0.2/2] M1 uncertaintysolMassstat.errorfloatM2[5.7/14] Secondary masssolMassphys.massfloate_M2[0.4/1] M2 uncertaintysolMassstat.errorfloatSpT1MK primary spectral typesrc.spTypecharSpT2MK secondary spectral typesrc.spTypecharMbol1[-9.6/-4.8] Primary bolometric magnitudemagphys.magAbs.bolfloate_Mbol1[0.1/0.6] Mbol1 uncertaintymagstat.errorfloatMbol2[-7.8/-2.4] Secondary bolometric magnitudemagphys.magAbs.bolfloate_Mbol2[0.2/0.7] Mbol2 uncertaintymagstat.errorfloatBC1[-3.6/-2.3] Primary bolometric correctionmagphot.mag.bcfloate_BC1[0.09/0.4] BC1 uncertaintymagstat.errorfloatBC2[-3/-1.4] Secondary bolometric correctionmagphot.mag.bcfloate_BC2[0.1/0.4] BC2 uncertaintymagstat.errorfloatMV1[-6/-2.4] Primary absolute V-band magnitudemagphys.magAbs;em.opt.Vfloate_MV1[0.04/0.3] MV1 uncertaintymagstat.errorfloatMV2[-4.8/-0.9] Secondary absolute V-band magnitudemagphys.magAbs;em.opt.Vfloate_MV2[0.1/0.3] MV2 uncertaintymagstat.errorfloate_VMag[0.07/0.3] VMag uncertaintymagstat.error;phot.mag;em.opt.VfloatAv[5.8/7.1] Adopted extinctionmagphys.absorptionfloate_Av[0.09/0.3] Av uncertaintymagstat.errorfloatVmag[10.3/15] Apparent magnitude of the systemmagphot.mag;em.opt.Vfloate_Vmag[0.01/0.03] Vmag uncertaintymagstat.error;phot.mag;em.opt.Vfloatf_VmagFlag on Vmag (1)meta.codecharrmsV[0.007/0.03] V rmsmagstat.errorfloatrmsN[0.03/0.05]? NSVS rmsmagstat.errorfloatnullablermsRV1[10.2/32.9] RV1 rmskm/sstat.errorfloatrmsRV2[14.3/37.6] RV2 rmskm/sstat.errorfloatDM[10.6/10.8] Distance modulusmagphot.mag.distModfloate_DM[0.1/0.3] DM uncertaintymagstat.errorfloatDist[1.3/1.5] Resulting distancekpcpos.distance;pos.heliocentricfloate_Dist[0.07/0.2] Dist uncertaintykpcstat.errorfloat_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/811/85/table1Radial Velocities for MT91 372, MT91 696, CPR2002 A36, & Schulte 3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar designationmeta.id;meta.maincharHJDHeliocentric Julian date; HJD-2400000.0dtime.epochdoublePhasePhasetime.phasefloatRVel1[-248/256]? Primary's radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RVel1[3/105]? Uncertainty in RVel1km/sstat.errorfloatnullablef_RVel1[a] a: Observation not used in solution fitmeta.codechar(O-C)1[-56/90]? Primary's (O-C) valuekm/sstat.fit.residualfloatnullableRVel2[-320/306]? Secondary's radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RVel2[1/46]? Uncertainty in RVel2km/sstat.errorfloatnullablef_RVel2[a] a: Observation not used in solution fitmeta.codechar(O-C)2[-51/99]? Secondary's (O-C) valuekm/sstat.fit.residualfloatnullableJ/ApJ/811/85/table3V-band Photometry of CPR2002 A36recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date; HJD-2400000.0dtime.epochdoubleVmag[11.3/11.9] The V band magnitude (1)magphot.mag;em.opt.Vfloate_Vmag[0.002/0.005] The 1{sigma} uncertainty in Vmag (G1)magstat.error;phot.mag;em.opt.VfloatJ/ApJ/811/85/table2V-band Photometry of MT91 372recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date; HJD-2400000.0dtime.epochdoubleVmag[14.9/15.6] The V band magnitudemagphot.mag;em.opt.Vfloate_Vmag[0.003/0.1] The 1{sigma} uncertainty in Vmag (G1)magstat.error;phot.mag;em.opt.VfloatJ/ApJ/811/85/table4V-band Photometry of MT91 696recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date; HJD-2400000.0dtime.epochdoubleVmag[12/12.7] The V band magnitude (1)magphot.mag;em.opt.Vfloate_Vmag[0.001/0.07] The 1{sigma} uncertainty in Vmag (G1)magstat.error;phot.mag;em.opt.Vfloat