J/AZh/87/853ivo://CDS.VizieR/J/AZh/87/853CDSVereshchangin S.V.Chupina N.V.2011-12-13T13:58:24Z2011-09-07T15:32:42ZCDS support team

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

cds-question@unistra.frnebulaeproper-motionsThe region of Orion's Sword with coordinates RA=83.79{deg}, DE=-5.20{deg} and a size of 1.0{deg}x2.5{deg} is analyzed. We compiled a master catalog of stars observed in the optical, containing positions, proper motions, and UBV photometry for 1634 stars. Using the nearest-neighbor-distance technique, we subdivided the region into stellar groups with different numbers of members. The positions of five groups coincide with known clusters, and two groups coincide with aggregates of stars with H{alpha} emission. We have identified groups with low membership that are moving away from the system. We also considered the kinematic structure of the groups using the AD-diagram method we developed earlier. Most of the stellar clusters and groups display similar kinematics, with the exception of the group OMC-2, which is moving toward its own apex. We also confirmed the existence of the kinematic star group 189 discovered earlier; its position is close to the cluster NGC 1977, and it is probably a component of its corona.2010AZh....87..853Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AZh/87/853CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AZh/88/143 : ORICAT, Stars in Orion Great Nebula (Vereshchagin+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AZh/87/853https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AZh/87/853http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AZh/87/853https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AZh/87/853https://vizier.iucaa.in/viz-bin/votable?-source=J/AZh/87/853http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AZh/87/853GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AZh/87/853/table2 (Stellar groups identified in the Orion's Sword region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AZh/87/853/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AZh/87/853/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AZh/87/853/table2?GETtext/xml+votable180.050000true83.63956806-5.714766390.0055555555555555566/21438 21439 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AZh/87/853?format=asciiOpticaldefaultJ/AZh/87/853/table2Stellar groups identified in the Orion's Sword regionBmagB magnitudemagphot.mag;em.opt.BfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroupGroup name (1)meta.idcharOricatOricat number, Cat. J/AZh/88/143meta.id;meta.mainintHIP? HIP numbermeta.idintnullableSpTypeMK spectral typesrc.spTypecharB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullablepmx? Proper motion along Xmas/yrpos.pm;pos.cartesian.xfloatnullablee_pmx? rms uncertainty on pmxmas/yrstat.errorfloatnullablepmy? Proper motion along Ymas/yrpos.pm;pos.cartesian.yfloatnullablee_pmy? rms uncertainty on pmymas/yrstat.errorfloatnullablePT? Membership Probability according to Tian et al. (1996, Cat. J/A+AS/118/503)%stat.fit.goodnessintnullablePM? Membership Probability according to McNamara et al., 1989AJ.....97.1427M%stat.fit.goodnessintnullableNotesNotesmeta.note_RAPositions from Oricat (Cat. J/AZh/88/143) (right ascension part)degpos.eq.ra;meta.main_DEPositions from Oricat (Cat. J/AZh/88/143) (declination part)degpos.eq.dec;meta.main