J/AJ/159/272ivo://CDS.VizieR/J/AJ/159/272doi:10.26093/cds/vizier.51590272CDSPlatais I.Robberto M.Bellini A.Kozhurina-Platais V.Gennaro M.,Strampelli G.Hillenbrand L.A.de Mink S.E.Soderblom D.R.2021-09-13T14:52:08Z2020-09-14T08:04:55ZCDS support team

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

cds-question@unistra.fropen-star-clustershst-photometryproper-motionsvisible-astronomyWe present a catalog of high-precision proper motions in the Orion Nebula Cluster (ONC), based on Treasury Program observations with the Hubble Space Telescope's (HST) ACS/WFC camera. Our catalog contains 2454 objects in the magnitude range of 14.2<m_F775W_<24.7, thus probing the stellar masses of the ONC from ~0.4M{sun} down to ~0.02M{sun} over an area of ~550arcmin^2^. We provide a number of internal velocity dispersion estimates for the ONC that indicate a weak dependence on stellar location and mass. There is good agreement with the published velocity dispersion estimates, although nearly all of them (including ours at {sigma }_{v,x}_=0.94 and {sigma}_{v,y}_=1.25mas/yr) might be biased by the overlapping young stellar populations of Orion A. We identified four new ONC candidate runaways based on HST and the Gaia DR 2 data, all with masses less than ~1M{sun}. The total census of known candidate runaway sources is 10-one of the largest samples ever found in any Milky Way open star cluster. Surprisingly, none of them have tangential velocities exceeding 20km/s. If most of them indeed originated in the ONC, it may compel the re-examination of dynamical processes in very young star clusters. It appears that the mass function of the ONC is not significantly affected by the lost runaways.2020AJ....159..272Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/272CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/118/503 : Proper motions of stars in Ori Nebula (Tian+ 1996)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)J/AJ/125/277 : High proper motions in central Orion nebula (O'dell+, 2003)J/A+A/446/949 : Open clusters proper motions based on UCAC2 (Dias+, 2006)J/ApJ/676/1109 : Velocities of stars in the Orion Nebula Cluster (Furesz+,2008)J/ApJ/697/1103 : Kinematics of Orion Nebula Cluster (Tobin+, 2009)J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010)J/ApJ/748/14 : ONC population data from WFI observations (Da Rio+, 2012)J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012)J/ApJS/207/10 : HST Treasury Program on the ONC (Robberto+, 2013)J/A+A/587/A153 : VISION I. VISTA Orion A Survey (Meingast+, 2016)J/A+A/608/A148 : Stellar populations towards Orion with Gaia DR1 (Zari+, 2017)J/A+A/619/A106 : 3D shape of Orion A from Gaia DR2 (Grossschedl+, 2018)J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018)J/AJ/156/98 : Runaway stars in 30 Doradus region of the LMC (Platais+, 2018)J/AJ/157/109 : Stellar proper motions in the Orion Nebula Cluster (Kim+,2019)J/ApJ/870/32 : Kinematics in young star clusters & associations (Kuhn+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/272https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/272http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/272https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/272https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/272http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/272GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/159/272/table1 (Proper Motion Catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/159/272/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/159/272/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/159/272/table1?GETtext/xml+votable180.050000true83.54124589-5.37397330.0055555555555555566/21438-21439 22804-22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/159/272?format=asciiOpticaldefaultJ/AJ/159/272/table1Proper Motion CatalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/8185] Entry number (1)meta.idintRAJ2000[83.54/83.98] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-5.69/-5.2] Declination (J2000)degpos.eq.dec;meta.mainpmx[-46.3/38.6] Weighed relative proper motion in Xmas/yrpos.pm;pos.cartesian.xfloatpmy[-46/38.3] Weighed relative proper motion in Ymas/yrpos.pm;pos.cartesian.yfloate_pmx[0/2.5] Error in pmxmas/yrstat.errorfloate_pmy[0/2.5] Error in pmymas/yrstat.errorfloatflag[0/9] Proper motion flag (4)meta.code.errorintchi2-x[0/96.6]? Normalized {chi}^2^ for proper motion in Xstat.fit.chi2floatnullablechi2-y[0.0/99.9]? Normalized {chi}^2^ for proper motion in Ystat.fit.chi2floatnullableqx[0/1] Goodness-of-fit probability Q in Xstat.fit.goodnessfloatqy[0/1] Goodness-of-fit probability Q in Ystat.fit.goodnessfloatimag[13.9/24.8] Sloan i-band magnitude; ACS/WFC+F775Wmagphot.mag;em.opt.IfloatTspan[9.85/11.05] Time span of observationsyrtime.expofloatn1[1/9] Number of first epoch observations (2)meta.numberintn2[1/13] Number of second epoch observations (2)meta.numberintnDel[0/5] Number of deleted observations (2)meta.numberintresid[0.003/1.4] Largest residual in least-squares fittingpixstat.fit.residualfloatXpix[-10810/20132] X-coordinate in ACS/WFC pixels (3)pixpos.cartesian.x;instr.detdoubleYpix[-21337/13554] Y-coordinate in ACS/WFC pixels (3)pixpos.cartesian.y;instr.detdouble