J/AJ/168/205ivo://CDS.VizieR/J/AJ/168/205CDSLinck E.Mathieu R.D.Latham D.W.2026-02-22T14:41:16Z2025-07-03T10:01:00ZCDS support team

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

cds-question@unistra.fropen-star-clustersradial-velocitymultiple-starsvisible-astronomyspectroscopyspectroscopic-binary-starsNGC 2506 is a rich, intermediate-age (2.0Gyr), metal-poor ([Fe/H]~-0.2) open cluster. This work presents the results of 12,157 spectroscopic radial-velocity measurements of 2442 stars in the NGC 2506 field obtained over 41yr, made as part of the WIYN Open Cluster Study. Radial-velocity measurements are complete for the population of proper-motion member stars brighter than a Gaia G magnitude of 15.5, in which 320 proper-motion and radial-velocity cluster members were identified. Within the observation limit of G<16.5, 469 proper-motion and radial-velocity members were identified. This work reports on the characteristics of NGC 2506, including projected spatial distribution, radial-velocity dispersion, and virial mass. This work also presents orbital solutions for 49 binary members with periods between 1 and 7580days. NGC 2506 has an incompleteness-corrected binary frequency for binaries with periods less than 104days of 35%+/-5%. This work also discusses in detail the 14 blue stragglers stars of NGC 2506 -- finding at least 64%+/-21% to be in binaries, five yellow straggler stars, and several other stars of note.2024AJ....168..205Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/205CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)J/A+AS/109/375 : Blue stragglers in open clusters (Ahumada+, 1995)J/A+A/463/789 : Blue stragglers in open clusters (Ahumada+, 2007)J/A+A/465/965 : BI light curve of NGC 2506 variables (Arentoft+, 2007)J/AJ/135/2264 : Stellar radial velocities in NGC 188 (Geller+, 2008)J/AJ/137/3743 : Spectroscopic binary orbits in NGC 188 (Geller+, 2009)J/AJ/138/159 : NGC 6819 stellar RV and photometry (Hole+, 2009)J/AJ/139/1383 : Radial velocities in M35 (NGC 2168) (Geller+, 2010)J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)J/AJ/147/138 : Rotational and RVs of red giants (Carlberg, 2014)J/AJ/148/38 : WIYN open cl. LX.RV survey NGC 6819 (Milliman+, 2014)J/AJ/148/61 : WIYN open cl. LIX.RVs of NGC 6791 (Tofflemire+, 2014)J/AJ/150/97 : RVs in M67. I. 1278 candidate members (Geller+, 2015)J/AJ/150/10 : WOCS. LXVI. Radial velocity survey in M35 (Leiner+, 2015)J/AJ/152/192 : WOCS. LXXII. NGC 2506 study (Anthony-Twarog+, 2016)J/AJ/151/152 : WOCS. LXXI. Sp.: 5 stars in NGC 6791 (Milliman+, 2016)J/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)J/AJ/155/138 : WOCS.LXXVI.Velocity & abund. NGC2506 (Anthony-Twarog+, 2018)J/A+A/618/A93 : Gaia DR2 open clusters in the MW (Cantat-Gaudin+, 2018)J/ApJS/245/13 : CDIPS. I. LCs from TESS sectors 6 and 7 (Bouma+, 2019)J/A+A/633/A99 : Gaia DR2 open clusters in MW. II (Cantat-Gaudin+, 2020)J/MNRAS/499/1312 : Properties stars: open cluster NGC 2506 (Knudstrup+, 2020)J/AJ/160/169 : WOCS.LXXXII. Orbital parameters & RVs NGC 7789 (Nine+, 2020)J/AJ/161/190 : RVs of binary population in M67 (Geller+, 2021)J/A+A/646/A104 : Improving the open cluster census. I. (Hunt+, 2021)J/A+A/650/A67 : Blue & yellow straggler stars in open clusters (Rain+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/168/205https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/168/205http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/168/205https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/168/205https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/168/205http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/168/205GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/168/205/table2 (Star summary table)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/168/205/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/168/205/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/168/205/table2?GETtext/xml+votable180.050000true120.01371806-10.762228060.0055555555555555566/21575 21586 215921.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/168/205?format=asciiOpticaldefaultJ/AJ/168/205/table2Star summary tablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNrvNumber of radial velocity measurements for this star (link to Table 3)meta.numberintnullableID[1001/136004]? WOCS source identification numbermeta.idintnullableBinDisplay the orbital parameters for this single-lined binary (link to Table 6)meta.ref.urlintnullableDBDisplay the orbital parameters for this double-lined binary (link to Table 7)meta.ref.urlintnullableGaiaDR3Gaia DR3 source identification numbermeta.id;meta.mainprimaryRA_ICRS[119/121] Gaia DR3 right ascension (ICRS) at Ep=2016.0 ({alpha})degpos.eq.ra;meta.mainDE_ICRS[-11.4/-10.2] Gaia DR3 declination (ICRS) at Ep=2016.0 ({delta})degpos.eq.dec;meta.mainGmag[9/20.2] Gaia DR3 G magnitude (G)magphot.mag;em.optfloatBP-RP[0/3]? Gaia DR3 BP-RP color (G_BP_-G_RP_)magphot.color;em.opt.B;em.opt.RfloatnullableN[0/53] Number of measurementsmeta.numberintRV[-46/318]? Mean radial velocity of star (1)km/sspect.dopplerVelocfloatnullablee_RV[0/157]? External error (standard deviation) of RV (e)km/sstat.error;spect.dopplerVelocfloatnullables_RV[0.4/37]? Internal error of RV (i)km/sstat.error;spect.dopplerVelocfloatnullablel_vsini[>/<] Limit flag on vsinimeta.code.error;phys.veloc.rotatcharvsini[10/120]? Projected rotational velocitykm/sphys.veloc.rotatintnullablee/i[0/392]? Ratio of external error over internal error; e_RV_ / s_RV_stat.error;arith.ratiofloatnullablePpmG[0/1]? Proper-motion membership probability from Gaussian mixture model (GMM) (P_{mu},G_)stat.probabilityfloatnullablePpmH[0/1]? Proper-motion membership probability from HDBSCAN (P_{mu},H_)stat.probabilityfloatnullablePrv[0/0.93]? Radial-velocity membership probability (P_RV_)stat.probabilityfloatnullableClassMembership classification (2)meta.code.membercharIDK20Identifier in Knudstrup+ 2020, J/MNRAS/499/1312meta.id.crosscharCommentCommentsmeta.notecharJ/AJ/168/205/table3Radial-velocity measurementsGaiaDR3Gaia DR3 source identification numbermeta.id;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1001/136004]? WOCS source identification numbermeta.idintnullableHJD[45302/60021] Truncated heliocentric Julian date (HJD-2400000)dtime.epoch;obsdoubleindexedRV1[-87/319] Primary radial velocitykm/sspect.dopplerVelocdoubleCH[0.23/0.99]? Primary cross-correlation peak height (Correlation)stat.correlationfloatnullable(O-C)1[-27/22]? Primary residual (O-C) valuekm/sstat.fit.residualfloatnullableRV2[-61/189]? Secondary radial velocitykm/sspect.dopplerVelocdoublenullable(O-C)2[-49/40]? Secondary residual (O-C) valuekm/sstat.fit.residualfloatnullablePhase[0/1]? Orbital phasetime.phasefloatnullableJ/AJ/168/205/table6Orbital parameters for NGC 2506 single-lined binariesNcyc[1/3269] Number of orbital cycles observedmeta.numberfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1017/31040] WOCS source identifiermeta.id;meta.mainintPer[1.2/7580] Orbital perioddtime.perioddoublee_Per[3e-6/180] The 1{sigma} error in Perdstat.error;time.periodfloatRVcm[79/88] Center-of-mass radial velocitykm/sspect.dopplerVelocfloate_RVcm[0.08/1.7] Standard uncertainty in gammakm/sstat.error;spect.dopplerVelocfloatK[3/39.3] Orbital semi-amplitude velocitykm/sphys.veloc.orbitalfloate_K[0.1/9] The 1{sigma} error in Kkm/sstat.error;phys.veloc.orbitalfloate[5e-3/0.82] Orbital eccentricitysrc.orbital.eccentricityfloate_e[5e-3/0.21] The 1{sigma} error in estat.error;src.orbital.eccentricityfloatomega[0/355.1] Longitude of periastrondegsrc.orbital.periastronfloate_omega[0.9/400] The 1{sigma} error in omegadegstat.error;src.orbital.periastronfloatT0[53210/59570] Truncated heliocentric Julian date of periastron passage; HJD-2400000dtime.epoch;src.orbital.periastrondoublee_T0[3e-2/210] The 1{sigma} error in T0dstat.error;time.epoch;src.orbital.periastronfloatasini[0.14/500] Projected semi-major axis1e+06kmphys.angSize.smajAxis;src.orbitalfloate_asini[7e-3/600] The 1{sigma} error in asini1e+06kmstat.error;phys.angSize.smajAxis;src.orbitalfloatf(M)[1.3e-5/0.28] Mass functionsolMassphys.massdoublee_f(M)[4e-6/0.3] The 1{sigma} error in f(M)solMassstat.error;phys.massfloatsigma[0.3/4.7] RMS residual velocitykm/sstat.fit.residual;phys.velocfloatNobs[11/34] Number of observationsmeta.number;obsintVPInteractive velocity plotmeta.ref.urlcharJ/AJ/168/205/table7Orbital parameters for NGC 2506 double-lined binariese_q[3.9e-3/8.1e-2] The 1{sigma} error in qstat.error;arith.ratio;phys.massfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[2013/36037] WOCS source identifiermeta.id;meta.mainintPer[2.3/642] Orbital perioddtime.perioddoublee_Per[1e-5/2] The 1{sigma} error in Perdstat.error;time.periodfloatNcyc[6.3/1740] Number of orbital cycles observedmeta.numberfloatRVcm[17/86] Center-of-mass radial velocitykm/sspect.dopplerVelocfloate_RVcm[0.06/1.6] Standard uncertainty in gammakm/sstat.error;spect.dopplerVelocfloatK1[19/113] Orbital semi-amplitude velocity of primarykm/sphys.veloc.orbitalfloate_K1[0.1/4] The 1{sigma} error in K1km/sstat.error;phys.veloc.orbitalfloatK2[24/97] Orbital semi-amplitude velocity of secondarykm/sphys.veloc.orbitalfloate_K2[0.13/6] The 1{sigma} error in K2km/sstat.error;phys.veloc.orbitalfloate[6e-3/0.76] Orbital eccentricitysrc.orbital.eccentricityfloate_e[2e-3/4e-2] The 1{sigma} error in estat.error;src.orbital.eccentricityfloatomega[40/358] Longitude of periastrondegsrc.orbital.periastronfloate_omega[0.3/130] The 1{sigma} error in omegadegstat.error;src.orbital.periastronfloatT0[55792/59648] Truncated heliocentric Julian date of periastron passage; HJD-2400000dtime.epoch;src.orbital.periastrondoublee_T0[0.018/10] The 1{sigma} error in T0dstat.error;time.epoch;src.orbital.periastronfloata1sini[1.6/164] Projected semi-major axis of primary1e+06kmphys.angSize.smajAxis;src.orbitalfloate_a1sini[1e-2/9] The 1{sigma} error in a1sini1e+06kmstat.error;phys.angSize.smajAxis;src.orbitalfloata2sini[2.1/380] Projected semi-major axis of secondary1e+06kmphys.angSize.smajAxis;src.orbitalfloate_a2sini[0.05/50] The 1{sigma} error in a2sini1e+06kmstat.error;phys.angSize.smajAxis;src.orbitalfloatm1sini[3e-2/11] Projected mass of primary (m_1_sin^3^i)solMassphys.massfloate_m1sini[5e-3/4] The 1{sigma} error in m1sinisolMassstat.error;phys.massfloatm2sini[0.023/4.7] Projected mass of secondary (m_2_sin^3^i)solMassphys.massfloate_m2sini[3e-3/1.1] The 1{sigma} error in m2sinisolMassstat.error;phys.massfloatq[0.43/1.2] The mass ratioarith.ratio;phys.massfloatsigma1[0.25/10.2] RMS residual velocity of primarykm/sstat.fit.residual;phys.velocfloatsigma2[0.73/13.3] RMS residual velocity of secondarykm/sstat.fit.residual;phys.velocfloatNobs1[12/53] Number of observations of primarymeta.number;obsintNobs2[10/53] Number of observations of secondarymeta.number;obsintVPInteractive velocity plotmeta.ref.urlchar