J/A+A/649/L8ivo://CDS.VizieR/J/A+A/649/L8doi:10.26093/cds/vizier.36499008CDSKhorrami Z.Langlois M.Vakili F.Clark P.C.Buckner A.S.M.,Gonzalez M.Crowther P.Wunsch R.Palous J.Boccaletti A.Lumsden S.,Moraux E.2023-04-24T12:08:51Z2021-05-07T08:10:46ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryWe compared high-contrast near-infrared images of the core of R136 taken by VLT/SPHERE, in two epochs separated by 3.06 years. For the first time we monitored the dynamics of the detected sources in the core of R136 from a ground-based telescope with adaptive optics. The aim of these observations was to search for High prOper Motion cAndidates (HOMAs) in the central region of R136 (r<6") where it has been challenging for other instruments. Two bright sources (K<15mag and V<16mag) are located near R136a1 and R136c (massive WR stars) and have been identified as potential HOMAs. These sources have significantly shifted in the images with respect to the mean shift of all reliable detected sources and their neighbours, and six times their own astrometric errors. We calculate their proper motions to be 1.36+/-0.22mas/yr^2^ (321+/-52km/s) and 1.15+/-0.11mas/yr^2^ (273+/-26km/s). We discuss different possible scenarios to explain the magnitude of such extreme proper motions, and argue for the necessity to conduct future observations to conclude on the nature of HOMAs in the core of R136.2021A&A...649L...8Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/649/L8CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/448/179 : HST photometry in R136 (Hunter+ 1995)J/A+A/602/A56 : R136 JKs photometry from VLT/SPHERE EAO (Khorrami+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/649/L8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/649/L8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/649/L8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/649/L8https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/649/L8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/649/L8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/649/L8/catalog (Catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/649/L8/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/649/L8/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/649/L8/catalog?GETtext/xml+votable180.050000true84.67665-69.10079720.0055555555555555566/330947.952274030004205e-20 6.367785378457404e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/649/L8?format=asciiInfrareddefaultJ/A+A/649/L8/catalogCatalogue_DEPositions from [HSH95] (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/580] Star identification, this papermeta.id;meta.mainintXposStar X position, this paperpixpos.cartesian.x;instr.detdoubleYposStar Y position, this paperpixpos.cartesian.y;instr.detdoubleKmagStar magnitude in SPHERE/IRDIS/Ks filter, this papermagphot.mag;em.IR.KfloatHmagStar magnitude in SPHERE/IRDIS/H filter, this papermagphot.mag;em.IR.HfloatKmag15Star magnitude in SPHERE/IRDIS/Ks filter from Khorrami et al. (2017, Cat. J/A+A/602/A56)magphot.mag;em.IR.KfloatJmag15Star magnitude in SPHERE/IRDIS/J filter from Khorrami et al. (2017, Cat. J/A+A/602/A56)magphot.mag;em.IR.Jfloat[HSH95]Star identification from Hunter et al. (1995, Cat. J/ApJ/448/179)meta.idintUmag? Star magnitude in HST/WFPC2/F336W filter from Hunter et al. (1995, Cat. J/ApJ/448/179)magphot.mag;em.opt.UfloatnullableVmagStar magnitude in HST/WFPC2/F555W filter from Hunter et al. (1995, Cat. J/ApJ/448/179)magphot.mag;em.opt.VfloatImagStar magnitude in HST/WFPC2/F884W filter from Hunter et al. (1995, Cat. J/ApJ/448/179)magphot.mag;em.opt.IfloatshiftLxStar PM in X direction in Lefts data-setspixpos.pmdoubleshiftLyStar PM in Y direction in Lefts data-setspixpos.pmdoubleshiftRxStars PM in X direction in Rights data-setspixstat.errordoubleshiftRyStars PM in Y direction in Rights data-setspixstat.errordoublesigmaLxStars PM error in X direction from LCT analysis in Left data-setspixpos.pmdoublesigmaLyStars PM error in Y direction from LCT analysis in Left data-setspixpos.pmdoublesigmaRxStar PM error in X direction from LCT analysis in Rights data-setspixstat.errordoublesigmaRyStar PM error in Y direction from LCT analysis in Rights data-setspixstat.errordoubletotSigmaLError on the PM of Star in Lefts (combination of LCT errors and photometric errors on the position of stars)pixstat.errordoubletotSigmaRError on the PM of Star in Rights (combination of LCT errors and photometric errors on the position of stars)pixstat.errordoubleAveShiftLneiAverage value of the shift of the neighbours within 50pix radius in Leftspixobs.paramdoubleAveShiftRneiAverage value of the shift of the neighbours within 50pix radius in Rightspixobs.paramdoubleErrtotTotal amount of error on the PM of Star averaged between Lefts and Rights using standard deviationpixstat.errordoubleErrphotPart of Errtot that just comes from photometrypixstat.errordouble_RAPositions from [HSH95] (right ascension part)degpos.eq.ra;meta.main