J/MNRAS/486/5726ivo://CDS.VizieR/J/MNRAS/486/5726doi:10.26093/cds/vizier.74865726CDSDias W.S.Monteiro H.Lepine J.R.D.Barros D.A.2024-08-19T20:18:40Z2022-12-15T13:18:12ZCDS support team

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

cds-question@unistra.fropen-star-clustersmilky-way-galaxyradial-velocityproper-motionsastrometryvisible-astronomytrigonometric-parallaxIn this work we revisit the issue of the rotation speed of the spiral arms and the location of the corotation radius of our Galaxy. This research was performed using homogeneous data set of young open clusters (age<50Myr) determined from Gaia Data Release 2 (DR2) data. The stellar astrometric membership was determined using proper motions and parallaxes, taking into account the full covariance matrix. The distance, age, reddening, and metallicity of the clusters were determined by our non-subjective multidimensional global optimization tool to fit theoretical isochrones to Gaia DR2 photometric data. The rotation speed of the arms is obtained from the relation between age and angular distance of the birthplace of the clusters to the present-day position of the arms. Using the clusters belonging to the Sagittarius-Carina, Local, and Perseus arms, and adopting the Galactic parameters R_0_=8.3kpc and V_0_=240km/s, we determine a pattern speed of 28.2+/-2.1km/s/kpc, with no difference between the arms. This implies that the corotation radius is R_c_=8.51+/-0.64kpc, close to the solar Galactic orbit (R_c_/R_0_=1.02+/-0.07).2019MNRAS.486.5726Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/486/5726CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)B/ocl : Optically visible open clusters and CandidatesJ/A+A/618/A59 : Gaia DR2 confirmed new nearby open clustersJ/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/486/5726https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/486/5726http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/486/5726https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/486/5726https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/486/5726http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/486/5726GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/486/5726/table2 (Results of mean astrometric parameters obtained using the Gaia DR2 stellar proper motion and parallaxes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/486/5726/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/486/5726/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/486/5726/table2?GETtext/xml+votable180.050000true2.5916758.741940.0055555555555555566/2940 3004 3061 3147 3257 3274 3283 3307 3361 3384 3606 3621-3622 3645 3715 3723 6188 14258 14263 14310 14324 14356 14620 14643 14646 15443 15622 15653 15667 21438 21517 21643 22246 22249 22880 22993 23637 23641 23717 24361 27661 28811-28812 29082 29533 37865 37895 37897 37901 37926 38016 38018 38024 38026 39181 39216 39251 39254 39259 39355 39714 39742 39754 39774 39776 39785 39801 39832 39883 41697 41699 41747 42202 42213 42303 42378-42379 42394 42470https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/486/5726?format=asciiOpticaldefaultJ/MNRAS/486/5726/table2Results of mean astrometric parameters obtained using the Gaia DR2 stellar proper motion and parallaxesSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNcNumber of cluster starsmeta.numberintRRadius used for each cluster to extract the Gaia DR2 data, centred on the coordinates of the cluster obtained from visual inspectionarcminphys.angSizefloatplxMean parallax of the clustermaspos.parallax.trigfloate_plx1{sigma} dispersion of the mean parallaxmasstat.error;pos.parallaxfloatpmRAMean proper motion in right ascension of the clustermas/yrpos.pm;pos.eq.rafloate_pmRA1{sigma} dispersion of pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEMean proper motion in declination of the clustermas/yrpos.pm;pos.eq.decfloate_pmDE1{sigma} dispersion of pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatRVMean radial velocity of the clusterkm/sphys.veloc;pos.heliocentricfloate_RV1{sigma} dispersion of RVkm/sstat.errorfloatJ/MNRAS/486/5726/table3Results of fundamental parameters obtained from the isochrone fitrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharDistDistancepcpos.distanceinte_DistError on Distpcstat.errorintlogAgeLogarithm of cluster agelog(yr)time.agefloate_logAgeError on logAgelog(yr)stat.error;time.agefloatE(B-V)E(B-V) color excessmagphot.color.excessfloate_E(B-V)Error on E(B-V)magstat.errorfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVError on RVkm/sstat.errorfloatZMetallicityphys.abund.Zfloate_ZError on Zstat.error;src.redshiftfloatJ/MNRAS/486/5726/table4Present-day and birthplace positions of the open clusters and their respective errorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharXPresent day X position of the open cluster (x-axis pointing to the Galactic rotation direction) (1)kpcpos.distance;pos.cartesian.xfloate_XError on X (2)kpcstat.error;pos.cartesian.xfloatYPresent day Y position of the open cluster (y-axis positive points towards the Galactic anticentre) (1)kpcpos.distance;pos.cartesian.yfloate_YError on Y (2)kpcstat.error;pos.cartesian.yfloatX0Birthplace X0 position of the open cluster (x-axis pointing to the Galactic rotation direction) (1)kpcpos.cartesian.x;pos.galacticfloate_X0Error on X0 (3)kpcstat.error;pos.cartesian.xfloatY0Birthplace Y0 position of the open cluster (y-axis positive points towards the Galactic anticentre) (1)kpcpos.cartesian.y;pos.galacticfloate_Y0Error on Y0 (3)kpcstat.error;pos.cartesian.yfloat