J/PASP/110/1172ivo://CDS.VizieR/J/PASP/110/1172doi:10.26093/cds/vizier.61101172CDSGim M.Hesser J.E.McClure R.D.Stetson P.B.2025-09-09T14:12:21Z2000-01-19T14:48:33ZCDS support team

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

cds-question@unistra.fropen-star-clustersradial-velocityvariable-starsA total of 597 radial velocity observations for 112 stars in the ~1.6Gyr old open cluster NGC 7789 have been obtained since 1979 with the radial velocity spectrometer at the Dominion Astrophysical Observatory. The mean cluster radial velocity is -54.9+/-0.12km/s and the dispersion is 0.86km/s, from 50 constant velocity stars selected as members from this radial velocity study and the 1981 proper motion study of McNamara & Solomon (1981A&AS...43..337M). Twenty-five stars (32%) among 78 members are possible radial velocity variable stars, but no orbits are determined because of the sparse sampling. Seventeen stars are radial velocity nonmembers, while the membership estimates of six stars are uncertain. There is a hint that the observed velocity dispersion falls off at large radius: this may be due to the inclusion of long-period binaries preferentially in the central area of the cluster. The known radial velocity variables also seem to be more concentrated toward the center than members with constant velocity. Although this is significant at only the 85% level, when combined with the similar result of Raboud & Mermilliod (1994A&A...289..121R) for three other clusters, the data strongly support the conclusion that mass segregation is being detected.1998PASP..110.1172Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/110/1172CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/110/1172https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/110/1172http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/110/1172https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/110/1172https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/110/1172http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/110/1172GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/PASP/110/1172/table3Radial velocity results in NGC 7789recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameKuestner (1923) or McNamara & Solomon identification numbermeta.idcharprimaryMMcNamara & Solomon (1981A&AS...43..337M) identification numbermeta.idcharG? Gim (1998) identification numbermeta.idintnullableVmag? V magnitudemagphot.mag;em.opt.VfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableRV? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RV? rms uncertainty on RV (internal error)0.01km.s**-1stat.errorintnullableo_RV? Number of observations used in the statistical analysismeta.numberintnullableDays? Number of days between first and last observationsdmeta.numberfloatnullableE/I? External over internal errors ratiostat.errorfloatnullableP(chi2)? Probability that velocity variations are due to random observational errorsstat.fit.goodnessfloatnullableMempm? Membership probability by proper motion (McNamara & Solomon, 1981A&AS...43..337M)pos.pm;stat.probabilityintnullableMemRV[YN] Membership by radial velocity (Scott et al., 1995AJ....109.1706S)meta.code.member;spect.dopplerVeloccharMemMembership adopted in this study (1)meta.code.membercharSimbadNameSimbad column added by the CDSmeta.idcharJ/PASP/110/1172/table2Radial velocity spectrometer observational datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharprimaryHJD? Heliocentric Julian datedtime.epochdoublenullableRV? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RV? rms uncertainty on RVkm/sstat.errorfloatnullablen_RV[ab] Note (2)meta.notechar