J/MNRAS/472/3887ivo://CDS.VizieR/J/MNRAS/472/3887doi:10.26093/cds/vizier.74723887CDSMelnik A.M.Dambis A.K.2024-08-17T20:21:02Z2017-10-13T10:06:22ZCDS support team

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

cds-question@unistra.frmilky-way-galaxystellar-associationsob-starsproper-motionsradial-velocityphotometryWe use stellar proper motions from the catalog TGAS (2016, Cat. I/337) to study the kinematics of OB-associations identified by Blaha and Humphreys (1989AJ.....98.1598B). The TGAS proper motions of OB-associations generally agree well with the Hipparcos proper motions. The parameters of the Galactic rotation curve obtained with TGAS and Hipparcos proper motions agree within the errors. The average internal velocity dispersion calculated for 18 OB-associations with more than 10 TGAS stars is sigma_v_=3.9km/s, which is considerably smaller, by a factor of 0.4, than the velocity dispersions derived from Hipparcos data. The effective contribution from binary OB-stars into the velocity dispersion sigma_v inside OB-associations is sigma_b_=1.2km/s. The median virial and stellar masses of OB-associations are equal to 7.1x10^5^ and 9.0x10^3^M_{sun}_, respectively. Thus OB-associations must be unbound objects provided they do not include a lot of dense gas. The median star-formation efficiency is epsilon=2.1%. Nearly one third of stars of OB-associations must lie outside their tidal radius. We found that the Per OB1 and Car OB1 associations are expanding with the expansion started in a small region of 11-27pc 7-10Myr ago. The average expansion velocity is 6.3km/s.2017MNRAS.472.3887Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/472/3887CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)I/337 : Gaia DR1 (Gaia Collaboration, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/472/3887https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/472/3887http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/472/3887https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/472/3887https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/472/3887http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/472/3887GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/472/3887/table1 (Kinematic parameters for 91 OB-associations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/472/3887/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/472/3887/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/472/3887/table1?GETtext/xml+votable180.050000true267.5844-29.5340.005555555555555556Cone search capability for table J/MNRAS/472/3887/table2 (Kinematic data for stars in OB-associations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/472/3887/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/472/3887/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/472/3887/table2?GETtext/xml+votable180.050000true265.8216-28.62230.0055555555555555565/325 813-815 820-821 832 900 902 928 931 3247 3562 3570 3573-3575 3577 3589 3657 3660-3661 3663 3672 3914-3915 5359 5995 6084 7205 7207 7229 7273 7365 7376 9333 9335 9467 9474 9476 9482 9504 10413 10542 10553 10556 6/859 1111 1115 1199 1285 1287 1297-1299 1310 1323 1328-1329 1332 1335 1348 1539 1542 1550 1554 1558 1755 1787 1790 1960 1962 2940 2943 3027 3029 3031 3034-3035 3037-3038 3043 3045 3050-3051 3055 3057-3060 3062-3063 3065-3066 3068 3138 3153 3156 3183 3188 3198 3231 3239 3243-3245 3247 3249-3251 3272 3274-3276 3278-3279 3288-3290 3292-3293 3296-3297 3299 3301-3302 3304-3305 3307-3308 3312 3315 3320 3324 3334 3337 3368 3384 3464 3585 3587 3589 3596-3597 3599 3604 3606 3612 3621-3623 3632-3634 3648-3649 3653 3716 3718-3719 3721-3723 3744 3746-3747 3755 3758 13032 13276 13535 13728 13960 13963 13999 14003-14004 14008 14015 14029 14050 14072 14075 14079 14097 14197 14207 14236-14238 14240 14245-14247 14252-14254 14256 14259-14261 14263-14264 14267-14269 14286-14287 14304 14306-14307 14313 14316-14317 14319-14320 14323-14326 14328 14353 14355 14360 14400 14456 14617 14619 14622-14623 14625 14632-14633 14635-14637 14648-14649 14666 14692-14693 14696 14711 14724 14737-14738 14740-14741 14743 14784 14805 15362 15365 15368-15369 15373 15376 15384 15392-15394 15396-15397 15399 15406 15427 15442 15452 15455 15476 15478-15479 15481 15484 15486 15510 15560-15561 15569 15571-15574 15577 15581 15617 15620 15623-15625 15627 15631-15633 15638 15640 15642 15650 15653-15654 15667 15670 15672 15682-15683 15685-15687 15689 15692 15703 15744 15747-15749 15759 15823 20757 20759 20761 20767 20800 21212 21233 21303 21395 21430 21432 21435 21450 21456 21479 21482 21515 21517-21519 21540 21635 21638 21641 21643-21644 21646-21647 21656 21669 21671 21680 22038 22044-22045 22057 22165-22166 22172 22174 22223 22240-22241 22243 22245-22246 22249 22252-22253 22258 22264 22787 22805 22839 22848-22849 22851-22852 22854-22855 22857-22859 22861-22862 22873 22884 22887 22889 22893 22895 22898 22904 22907 22993-22994 23572 23632 23634 23637 23644 23695 23717 23851 23936 23979 23986 23990 23993-23996 23998 24320 24324-24325 24327 24333-24334 24340 24483 24486 24489 24496 24500 24504 24508 24510-24511 24520 24546 24552 24554-24555 28730 28732 28803 28807 28825 28848 28853 28864 28872 28879 28888 28890-28892 28894 28901 28903 28912-28913 28915 29088-29089 29091 29096 29098 29100-29101 29106-29107 29113 29115-29116 29118-29119 29160 29162-29163 29166 29179 29182 29456-29457 29459 29508 29510 29512-29513 29515 29520 29527 29529-29532 29534-29535 30211 30217 30220 30232 30234 30242 30247 30256 30258 31756 37245 37247 37337 37339 37854 37862-37863 37867 37873-37874 37880 37882-37883 37891 37894-37895 37900-37901 37910 37912 37921 37923 37926-37927 37932-37934 37936 37938 38020 38022 38024-38026 39189 39194-39195 39205-39207 39209 39211 39216 39220 39227 39233 39235-39238 39241 39243-39245 39248-39249 39252 39254 39281 39297 39384 39386 39733 39739 39742-39743 39754 39771 39774-39776 39778-39780 39793 39796 39798-39799 39801 39803-39804 39806-39807 39828 39831-39832 39857 39861 39864 39868 39873 39876 39878 39888 39904 39907 39910 39913 39930 40490 41630-41631 41649-41651 41657 41661-41663 41671 41677 41696 41698-41699 41704 41707 41738 41756 41758 41760-41761 41813 41856 42153-42154 42156-42157 42162-42163 42166 42172 42174 42187 42191 42199 42201-42203 42206 42209 42216 42221 42223 42228 42234-42236 42370 42376 42378 42383 42392 42394-42395 42405 42407-42408 42416-42417 42458 42482-42483 42486 42489 42491 42516 42932 42948 42956 42959 42977 42987 43026-43028 43030-43033 43035-43036 43072 44305 44360 44367 443893.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/472/3887?format=asciiOpticaldefaultJ/MNRAS/472/3887/table1Kinematic parameters for 91 OB-associationsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAssName of OB-associations from the list by BHmeta.id;meta.maincharGLONAverage Galactic Longitudedegpos.galactic.lonGLATAverage Galactic Latitudedegpos.galactic.latrAverage Heliocentric distancekpcpos.distance;pos.heliocentric;stat.meanfloatNtNumber of stars with known photometrymeta.numberintHVR? Median heliocentric Radial velocitykm/sspect.dopplerVeloc;stat.medianfloatnullables_HVR? Dispersion of HVRkm/sinstr.dispersionfloatnullablenvrNumber of stars with known HVRmeta.numberintpmGLON? Median proper motion along Galactic Longitudemas/yrpos.pm;em.wl.central;stat.medianfloatnullables_pmGLON? Dispersion of pmGLONmas/yrinstr.dispersionfloatnullablepmGLAT? Median proper motion along Galactic Latitudemas/yrpos.pm;em.wl.central;stat.medianfloatnullables_pmGLAT? Dispersion of pmGLATmas/yrinstr.dispersionfloatnullablenmuNumber of stars with known TGAS proper motionsmeta.numberint_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into account (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into account (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/MNRAS/472/3887/table2Kinematic data for stars in OB-associationsSimbadNameSimbad column added by the CDSmeta.idcharNameStar namemeta.id;meta.maincharAssName of OB-associationmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintspSpectral type of the starsrc.spTypecharcLCode of the luminosity class (1)src.class.luminosityintVmagApparent V magnitude of the starmagphot.mag;em.opt.VfloatGLONGalactic Longitude of the star, or of the associationdegpos.galactic.lonGLATGalactic Latitude of the star, or of the associationdegpos.galactic.latrHeliocentric distance of the OB-associationkpcpos.distance;pos.heliocentricfloatHVR? Heliocentric radial velocity of the starkm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_HVR? Error of HVRkm/sstat.errorfloatnullableHIP? Hipparcos catalog numbermeta.record;phys.atmol.number;meta.tableintnullablepmGLON? Proper motion along Galactic Longitidemas/yrpos.pmfloatnullablee_pmGLON? Error of pmGLONmas/yrstat.errorfloatnullablepmGLAT? Proper motion along Galactic Latitidemas/yrpos.pmfloatnullablee_pmGLAT? Error of pmGLATmas/yrstat.errorfloatnullableFSource of proper motions (2)meta.codecharB-VColor index B-V of the starmagphot.color;em.opt.B;em.opt.VfloatU-B? Color index U-B of the starmagphot.color;em.opt.U;em.opt.BfloatnullableVMAGAbsolute V magnitude of the starmagphys.magAbs;em.opt.VfloatAVV-band extinctionmagphys.absorption;em.opt.Vfloat_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into account (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into account (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed