J/AN/325/705ivo://CDS.VizieR/J/AN/325/705doi:10.26093/cds/vizier.113250705CDSBejar V.J.S.Zapatero Osorio M.R.Rebolo R.2025-09-29T20:17:28Z2005-05-27T21:10:49ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starslate-type-starsccd-photometryinfrared-photometryvisible-astronomybroad-band-photometryWe present an RI photometric survey covering an area of 430 arcmin^2^ around the multiple star sigma Orionis. The observations were conducted with the 0.8m IAC-80 Telescope at the Teide Observatory. The survey limiting R and I magnitudes are 22.5 and 21, and completeness magnitudes 21 and 20, respectively. We have selected 53 candidates from the I vs. R-I colour-magnitude diagram (I=14-20) that follow the previously known photometric sequence of the cluster. Adopting an age of 2-4 Myr for the cluster, we find that these objects span a mass range from 0.35M_{sun}_ to 0.015M_{sun}_. We have performed J-band photometry of 52 candidates and K_s photometry for 12 of them, with the result that 50 follow the expected infrared sequence for the cluster, thus confirming with great confidence that the majority of the candidates are bona fide members. JHK_s photometry from the Two Micron All Sky Survey (2MASS, Cat. <II/246>) is available for 50 of the candidates and are in good agreement with our data. Out of 48 candidates, which have photometric accuracies better than 0.1mag in all bands, only three appear to show near-infrared excesses.2004AN....325..705Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AN/325/705CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/419/249 : RJHKs photometry of sigma Ori low-mass stars (Scholz+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AN/325/705https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AN/325/705http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AN/325/705https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AN/325/705https://vizier.iucaa.in/viz-bin/votable?-source=J/AN/325/705http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AN/325/705GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AN/325/705/table2 (Photometric and spectroscopic parameters for 53 Sigma Orionis candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AN/325/705/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AN/325/705/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AN/325/705/table2?GETtext/xml+votable180.050000true84.962917-2.8288890.0055555555555555566/22851 22854https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AN/325/705?format=asciiOpticalInfrareddefaultJ/AN/325/705/table2Photometric and spectroscopic parameters for 53 Sigma Orionis candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BMZ2001]IAU Name (S Ori JHHMMSS.s+DDMMSS)charn_[BMZ2001]Note on [BMZ2001] (1)charONameName of previous identified objectscharChartIDFinder chart identification number in articleintImagJohnson I magnitudemagfloate_ImagI magnitude errormagfloatR-IJohnson R-I colour indexmagfloate_R-IR-I colour errormagfloatJmag? Johnson J magnitudemagfloatnullablee_Jmag? J magnitude errormagfloatnullableI-J? Johnson I-J colour indexmagfloatnullablee_I-J? I-J colour errormagfloatnullableI-Ks? I-Ks colour indexmagfloatnullablee_I-Ks? I-Ks colour errormagfloatnullableI-J2? I-J colour index (J from 2MASS)magfloatnullablee_I-J2? I-J2 colour error (J from 2MASS)magfloatnullableJ-H? J-H colour index (2MASS photometry)magfloatnullablee_J-H? J-H colour error (2MASS photometry)magfloatnullableH-Ks? H-Ks colour index (2MASS photometry)magfloatnullablee_H-Ks? H-Ks colour error (2MASS photometry)magfloatnullableSpTypeMK Spectral TypecharE(R-I)? R-I colour excessmagfloatnullablee_E(R-I)? R-I colour excess errormagfloatnullableRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainpnm[pnm] pnm: probably not memberchar