J/AJ/117/1375ivo://CDS.VizieR/J/AJ/117/1375doi:10.26093/cds/vizier.51171375CDSSimon M.Close L.M.Beck T.L.2023-04-06T16:50:32Z2001-05-04T22:13:47ZCDS support team

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

cds-question@unistra.fropen-star-clustersmultiple-starsphotometryWe have imaged an area ~5arcmin^2^ at the center of the Trapezium cluster in Orion in the K band using the University of Hawaii (UH) adaptive optics system at the UH 2.2 m telescope. Our survey detects 292 stars brighter than K=18.2mag and resolves pairs to the 0.23" diffraction limit of the telescope. The binary fraction in the angular separation range 0.3"-0.6", corresponding to 132-264AU at 440pc, is indistinguishable from that of the solar-like stars in the solar neighborhood. Proplyds are associated with both single stars and visual binaries. About half the stars in our sample have also been measured at V and I by Prosser et al. (1994ApJ...421..517P); most of these seem to be about 10^6^yr old, observed through moderate extinction, and having some excess emission at K. The luminosity function turns over before the stellar limit of ~13.5mag, indicating that the cluster does not contain a large population of massive brown dwarfs.1999AJ....117.1375Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/117/1375CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/117/1375https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/117/1375http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/117/1375https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/117/1375https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/117/1375http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/117/1375GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/117/1375/table1 (Detected stars in the Trapezium cluster)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/117/1375/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/117/1375/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/117/1375/table1?GETtext/xml+votable180.050000true83.80464583-5.366766670.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/117/1375?format=asciiOpticaldefaultJ/AJ/117/1375/table1Detected stars in the Trapezium clusterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SCB99]Sequential numbermeta.id;meta.mainintxposx positionpixpos.cartesian.x;instr.detintyposy positionpixpos.cartesian.y;instr.detintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainKmag? K magnitudemagphot.mag;em.IR.KfloatnullableVmag? V magnitudemagphot.mag;em.opt.VfloatnullableImag? I magnitudemagphot.mag;em.opt.IfloatnullablePSHProsser et al. (1994ApJ...421..517P) identification numbermeta.idintTCCMcCaughrean et al. (1994AJ....108.1382M) identification numbermeta.idintNameOther namemeta.idchar