J/MNRAS/487/2771ivo://CDS.VizieR/J/MNRAS/487/2771doi:10.26093/cds/vizier.74872771CDSNavarete F.Galli P.A.B.Damineli A.2024-08-19T20:18:56Z2019-06-19T08:28:48ZCDS support team

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

cds-question@unistra.frh-ii-regionsstellar-distanceearly-type-starsinfrared-sourcesThe Perseus Arm is the closest Galactic spiral arm from the Sun, offering an excellent opportunity to study in detail its stellar population. However, its distance has been controversial with discrepancies by a factor of two. Kinematic distances are in the range 3.9-4.2kpc as compared to 1.9-2.3kpc from spectrophotometric and trigonometric parallaxes, reinforcing previous claims that this arm exhibits peculiar velocities. We used the astrometric information of a sample of 31 OB stars from the star-forming W3Complex to identify another 37 W3 members and to derive its distance from their Gaia-DR2 parallaxes with improved accuracy. The Gaia-DR2 distance to the W3Complex, 2.14^+0.08^_-0.07_kpc, coincides with the previous stellar distances of ~2kpc. The Gaia-DR2 parallaxes tentatively show differential distances for different parts of the W3 Complex: W3 Main, located to the NE direction, is at 2.30^+0.19^_-0.16_kpc, the W3 Cluster (IC1795), in the central region of the complex, is at 2.17^+0.12^_-0.11_kpc, and W3(OH) is at 2.00^+0.29^_-0.23_kpc to the SW direction. The W3 Cluster is the oldest region, indicating that it triggered the formation of the other two star-forming regions located at the edges of an expanding shell around the cluster.2019MNRAS.487.2771Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/487/2771CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/813/42 : O and B type stars in W3: first results (Kiminki+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/487/2771https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/487/2771http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/487/2771https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/487/2771https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/487/2771http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/487/2771GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/487/2771/table2 (Known OB stars associated with the W3 Complex)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/487/2771/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/487/2771/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/487/2771/table2?GETtext/xml+votable180.050000true36.327562.0214440.005555555555555556Cone search capability for table J/MNRAS/487/2771/table3 (Gaia-DR2 astrometric information of the OB-type stellar population of the W3 Complex)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/487/2771/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/487/2771/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/487/2771/table3?GETtext/xml+votable180.050000true36.3273562.021348890.005555555555555556Cone search capability for table J/MNRAS/487/2771/table4 (Gaia-DR2 data of the new W3 members selected)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/487/2771/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/487/2771/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/487/2771/table4?GETtext/xml+votable180.050000true36.7158338961.905581110.0055555555555555566/36491.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/487/2771?format=asciiInfrareddefaultJ/MNRAS/487/2771/table2Known OB stars associated with the W3 ComplexrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmoreindicates astrometric information in table 3meta.ref.urlcharID[1/48] ID of the sourcemeta.id;meta.mainintprimaryNameName of the sourcemeta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpTypeMK Spectral typesrc.spTypecharW3subAssociated subregion of the W3 Complexmeta.id.assoccharRefReference (1)meta.ref;pos.framechar2MASS2MASS designationmeta.idcharoff2M? Offset between the source and 2MASS coordinatesarcsecpos.angDistancefloatnullableSNameSimbad namemeta.idcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/487/2771/table3Gaia-DR2 astrometric information of the OB-type stellar population of the W3 ComplexRUWERe-Normalised Unit Weight Errorstat.weightfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/48] ID of the source (same as table 2)meta.id;meta.mainintGDR2Gaia DR2 designationmeta.idcharoff2MOffset between 2MASS and Gaia-DR2 coordinatesarcsecpos;arith.difffloatRA_ICRSRight ascension (ICRS) at epoch 2015.5 of the Gaia-DR2 sourcedegpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at epoch 2015.5 of the Gaia-DR2 sourcedegpos.eq.dec;meta.mainpmRAProper motion in the RA axis, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRAError on the proper motion in the RA axismas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in the DE axismas/yrpos.pm;pos.eq.decfloate_pmDEError on the proper motion in the DE axismas/yrstat.error;pos.pm;pos.eq.decfloatpmTotTotal proper motionmas/yrpos.pmfloate_pmTotError on the total proper motionmas/yrstat.errorfloatPlxGaia-DR2 absolute parallaxmaspos.parallaxfloate_PlxError on the Gaia-DR2 parallaxmasstat.error;pos.parallaxfloatGmagGaia G-band magnitudemagphot.mag;em.optfloatBP-RPGaia BP-RP colour indexmagphot.color;em.opt.B;em.opt.Rfloatflag[*] sources with an * have RUWE>1.4 and are excluded from the analysismeta.code.errorchar_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexedJ/MNRAS/487/2771/table4Gaia-DR2 data of the new W3 members selectedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDID of the source (GNN)meta.id;meta.maincharGDR2Gaia DR2 designationmeta.idcharW3subAssociated subregion of the W3 Complexmeta.id.assoccharRAJ2000Right ascension (J2000) of the Gaia-DR2 sourcedegpos.eq.ra;meta.mainDEJ2000Declination (J2000) of the Gaia-DR2 sourcedegpos.eq.dec;meta.mainpmRAProper motion in the RA axis, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRAError on the proper motion in the RA axismas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in the Dec axismas/yrpos.pm;pos.eq.decfloate_pmDEError on the proper motion in the Dec axismas/yrstat.error;pos.pm;pos.eq.decfloatpmTotTotal proper motionmas/yrpos.pmfloate_pmTotError on the total proper motionmas/yrstat.errorfloatPlxGaia-DR2 absolute parallaxmaspos.parallaxfloate_PlxError on the Gaia-DR2 parallaxmasstat.error;pos.parallaxfloatGmagGaia-DR2 G-band magnitudemagphot.mag;em.optfloatBP-RPGaia-DR2 BP-RP colour indexmagphot.color;em.opt.B;em.opt.RfloatRUWEGaia-DR2 Re-Normalised Unit Weight Errorstat.weightfloat