J/PASP/131/D4101ivo://CDS.VizieR/J/PASP/131/D4101doi:10.26093/cds/vizier.61323101CDSGao X.-H.2025-09-09T14:14:59Z2019-04-08T16:01:57ZCDS support team

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

cds-question@unistra.fropen-star-clustersstellar-populationsThis paper presents an investigation on fundamental astrophysical properties of the Pleiades cluster (M 45) using high-precision astrometric and photometric data from the Gaia Data Release 2 (Gaia-DR2). To obtain reliable cluster members, a machine-learning (ML) method is used to compute membership probabilities for 31462 sample stars within a radius of 6.5{deg} from the cluster center, both the astrometric and photometric data are taken into account. We obtain a total number of 1454 likely cluster members with membership probabilities larger than 0.6, including a well-known white dwarf (LB 1497) with a high membership probability of ~0.96. We find a well-defined relationship between the parallaxes and proper motions of the cluster members, the most likely explanation for the relationship is that the depth effect of the cluster along the line of sight must be taken into consideration. Using Monte Carlo simulations, the most likely distance, proper motion, and radial velocity of the cluster are determined to be D=136.0+/-0.1pc, (<{mu}_{alpha}_cos{delta}>, <{mu}_{delta}_>)=(+20.141+/-0.093, -45.536+/ -0.081)mas/yr, and <V_r_>=+5.8+/-0.1km/s, respectively. It is found that the likely cluster members extend outward to a limiting radius of R_lim_=310'+/-12' (12.3+/-0.5pc) from the cluster center, and the total mass of the cluster within this radius is M_tot_=721+/-93M_{sun}_. We find clear evidence for the presence of spatial mass segregation in this young cluster by analyzing the photometry and spatial positions of the likely cluster members. Interestingly, we also find that four high-mass cluster members with high membership probabilities (>0.99) are being ejected from the inner region of the cluster, they may have formed via close encounters between single and binary stars.2019PASP..131d4101Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/131/D4101CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/563/A45 : Pleiades cluster membership probabilities (Sarro+, 2014)J/A+A/617/A15 : Membership probabilities of Pleiades objects (Olivares+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/131/D4101https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/131/D4101http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/131/D4101https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/131/D4101https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/131/D4101http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/131/D4101GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/131/D4101/table3 (A catalog of fundamental information for the 1454 likely cluster members with P_RF_>=0.6)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/131/D4101/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/131/D4101/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/131/D4101/table3?GETtext/xml+votable180.050000true56.4244936885824.431322983980.0055555555555555564/28 30 5/89 91 94 116-118 124 126 209 212 6/317 353 360-362 368 370 381-382 405 413-414 436-437 439 444 447 476 478-479 500 502-503 509-511 832 835 852 1153 1160 1162 1164 1166 1192-1194 1536https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/131/D4101?format=asciidefaultJ/PASP/131/D4101/table3A catalog of fundamental information for the 1454 likely cluster members with P_RF_>=0.6recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia-DR2 identifiermeta.id;meta.mainRA_ICRSGaia DR2 right ascension (ICRS) at epoch 2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 declination (ICRS) at epoch 2015.5degpos.eq.dec;meta.mainPmembRF membership probabilitystat.probabilityfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed