J/A+A/493/931ivo://CDS.VizieR/J/A+A/493/931doi:10.26093/cds/vizier.34930931CDSBouy H.Huelamo N.Martin E.L.Marchis F.Barrado Y Navascues D.,Kolb J.Marchetti E.Petr-Gotzens M.G.Sterzik M.Ivanov V.D.,Koehler R.Nuernberger D.2009-06-06T07:55:41Z2009-06-06T07:50:04ZCDS support team

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

cds-question@unistra.frstellar-associationsinfrared-photometryNearby young clusters are privileged places to study the star formation history. Over the last decade, the sigma-Orionis cluster has been a prime location for the study of young very low mass stars, substellar and isolated planetary mass objects and the determination of the initial mass function. To extend previous studies of this association to its core, we searched for ultracool members and new multiple systems within the 1.5'x1.5' central region of the cluster. We obtained deep multi-conjugate adaptive optics (MCAO) images of the core of the sigma-Orionis cluster with the prototype MCAO facility MAD at the VLT using the H and Ks filters. These images allow us to detect companions fainter by DeltaH~5mag as close as 0.2" on a typical source with H=14.5mag. These images were complemented by archival SofI Ks-band images and Spitzer IRAC and MIPS mid-infrared images.2009A&A...493..931Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/493/931CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/478/667 : The Mayrit catalogue (Caballero, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/493/931https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/493/931http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/493/931https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/493/931https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/493/931http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/493/931GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/493/931/table8 (NTT/SofI Ks-band photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/493/931/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/493/931/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/493/931/table8?GETtext/xml+votable180.050000true84.63875-2.6047220.005555555555555556Cone search capability for table J/A+A/493/931/table3 (Catalog of sources detected in the MAD images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/493/931/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/493/931/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/493/931/table3?GETtext/xml+votable180.050000true84.68125-2.6065830.0055555555555555566/22851 22854https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/493/931?format=asciiInfrareddefaultJ/A+A/493/931/table8NTT/SofI Ks-band photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSofISigOri-SofI number (SigOri-SofI-NNN)meta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainKsmagKs magnitude (1)magphot.mag;em.IR.Kfloat2MASSNearest 2MASS source name (2)meta.idcharMayrit? Nearest Mayrit source name (2)meta.idintnullableJ/A+A/493/931/table3Catalog of sources detected in the MAD imagesONameOther namemeta.idComCommentsmeta.noterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_MAD[*+] PMO/BD object (1)meta.notecharMADSigOri-MAD number (SigOri-MAD-NN)meta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmag (2)magstat.error;phot.mag;em.IR.Hfloatnullablel_KsmagLimit flag on Ksmagmeta.code.errorcharKsmagKs magnitudemagphot.mag;em.IR.Kfloate_Ksmag? rms uncertainty on Ksmag (2)magstat.error;phot.mag;em.IR.Kfloatnullable