J/AJ/147/69ivo://CDS.VizieR/J/AJ/147/69doi:10.26093/cds/vizier.51470069CDSHayes C.R.Friel E.D.2017-09-20T05:13:34Z2014-09-12T17:08:59ZCDS support team

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

cds-question@unistra.fropen-star-clustersradial-velocityWe present radial velocities for stars in the field of the open star clusters Berkeley 44, Berkeley 81, and NGC 6802 from spectra obtained using the Wisconsin-Indiana-Yale-NOAO (WIYN) 3.5m telescope. These clusters are of intermediate age (1-3Gyr), located within the solar Galactocentric radius, and have no previous radial velocity measurements. We find mean radial velocities of -9.6{+/-}3.0km/s, 48.1{+/-}2.0km/s, and 12.4{+/-}2.8km/s for Be 44, Be 81, and NGC 6802, respectively. We present an analysis of radial velocities of 134 open clusters of a wide range of ages using data obtained in this study and the literature. Assuming the system of clusters rotates about the Galactic center with a constant velocity, we find older clusters exhibit a slower rotation and larger line-of-sight (LOS) velocity dispersion than younger clusters. The gradual decrease in rotational velocity of the cluster system with age is accompanied by a smooth increase in LOS velocity dispersion, which we interpret as the effect of heating on the open cluster system over time.2014AJ....147...69Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/147/69CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/437/1241 : Be 81, NGC 1917 and NGC 2141 BVI photometry (Donati+, 2014)J/AJ/141/92 : BVI photometry of 10 distant open clusters (Janes+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/147/69https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/147/69http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/147/69https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/147/69https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/147/69http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/147/69GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/147/69/table1 (Properties of observed clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/69/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/69/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/69/table1?GETtext/xml+votable180.050000true289.30319.54630.005555555555555556Cone search capability for table J/AJ/147/69/table2 (Individual stellar velocities and membership)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/69/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/69/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/69/table2?GETtext/xml+votable180.050000true289.1981519.476220.005555555555555556Cone search capability for table J/AJ/147/69/table3 (Cluster properties and mean radial velocities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/69/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/69/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/69/table3?GETtext/xml+votable180.050000true80.150530.59570.0055555555555555566/463 1302 1325 1481 1486 1930 2940 2942 3045 3076 3230 3257 3277 3308 3317 3604 3622 3632 3634 4078 4298 4698 6149 6760 14175 14322 14336 14575 14752 15121 15595 15759 16490 20562 20797 20814 20903 20939 20957 20989 21372 21523 21538 21549 21557 21586 21682 21719 21774 22111 22130 22216 22239 22433 22499 22871 22887 23410 23538 23637 23745 23761 23861 24121 24228 24330 24344 24345 24491 24522 28711 28806 28818 28868 29523 30215 30256 30308 30311 30335 30439 30635 30653 31812 32089 37231 37237 37340 37351 37592 37705 37790 37867 37901 37904 37920 37933 37971 38024 38242 39131 39356 39374 39697 39766 39770 39775 39776 39901 39912 39956 40101 40104 40696 41613 41646 41688 41710 41770 41834 41863 42135 42153 42177 42216 42274 42374 42399 42402 42464 42583 43033 43034 433013.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/147/69?format=asciiOpticaldefaultJ/AJ/147/69/table1Properties of observed clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id;meta.maincharprimaryRef[ab] Reference of cluster photometry (1)meta.refcharNNumber of stars observed in this clustermeta.numberintnullableGLON[34.51/55.32] Galactic longitudedegpos.galactic.lonGLAT[-2.07/3.35] Galactic latitudedegpos.galactic.lat(m-M)0[11.3/12.6] Intrinsic distance modulusmagphot.mag.distModfloatE(B-V)[0.84/1] Reddeningmagphot.color.excessfloatDist[1800/3200] Heliocentric distancepcpos.distanceintRgc[5.6/7.1] Galactocentric distancekpcpos.distance;pos.galactocentricfloatZ[-0.12/0.18] Distance from the Galactic Planekpcpos.cartesian.z;pos.galacticfloatAge[1/2.9] Cluster ageGyrtime.agefloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/AJ/147/69/table2Individual stellar velocities and membershipf_Star[u] Star ID and photometry unpublished (2)meta.codecharRV[-73.6/93.5] Radial velocitykm/sphys.veloc;pos.heliocentricfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster name (Berkeley 44, Berkeley 81, NGC 6802) (1)meta.id.parentcharStar[219/79900] Star number in cluster (1)meta.id;meta.maininte_RVRadial velocity uncertaintykm/sstat.errorfloatVmag[13.81/16.89] V-band magnitudemagphot.mag;em.opt.VfloatB-VThe B-V color indexmagphot.color;em.opt.B;em.opt.VfloatMmbCluster membership status (Yes or No) (3)meta.code.memberchar_RAPosition, from Janes & Hoq 2011 (J/AJ/141/92) for Berkeley 44 and NGC 6802, and from Donati et al. 2014 (J/MNRAS/437/1241) for Berkeley 81. (right ascension part)degpos.eq.ra;meta.main_DEPosition, from Janes & Hoq 2011 (J/AJ/141/92) for Berkeley 44 and NGC 6802, and from Donati et al. 2014 (J/MNRAS/437/1241) for Berkeley 81. (declination part)degpos.eq.dec;meta.mainJ/AJ/147/69/table3Cluster properties and mean radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id;meta.maincharGLON[2.88/357.94] Galactic longitudedegpos.galactic.lonGLAT[-79.26/32.48] Galactic latitudedegpos.galactic.lat<RV>[-84/134.3] Cluster mean radial velocitykm/sspect.dopplerVeloc;stat.meanfloate_<RV>Radial velocity errorkm/sstat.errorfloatDist[45/14500] Heliocentric distancepcpos.distancefloatRgc[5.6/22.1] Galactocentric distancekpcpos.distance;pos.galactocentricfloatZ[-1.9/2.017] Distance from the Galactic Planekpcpos.cartesian.z;pos.galacticfloatlogAge[6.2/10.1] Log of the cluster agelog(yr)time.agefloatRV[-234.4/230.4] Cluster radial velocity (1)km/sphys.veloc;pos.heliocentricfloatcos(psi)[-1/0.989] Cosine of the angle {psi} (1)instr.offsetfloatRefReference; in refs.dat filemeta.ref;pos.framecharSimbadNameSimbad column added by the CDSmeta.idchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/AJ/147/69/refsReferencesCatVizeR catalogmeta.id;meta.tablecharAutAuthor's namemeta.bib.authorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference identifierpos.frameintBibCodeBibliographic codemeta.bib.bibcodechar