J/ApJ/748/14ivo://CDS.VizieR/J/ApJ/748/14doi:10.26093/cds/vizier.17480014CDSDa Rio N.Robberto M.Hillenbrand L.A.Henning T.Stassun K.G.2017-12-22T05:33:20Z2013-11-05T08:16:52ZCDS support team

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

cds-question@unistra.frstellar-massesstellar-ageseffective-temperatureextinctionopen-star-clustersWe present a new census of the Orion Nebula Cluster over a large field of view (>~30'x30'), significantly increasing the known population of stellar and substellar cluster members with precisely determined properties. We develop and exploit a technique to determine stellar effective temperatures from optical colors, nearly doubling the previously available number of objects with effective temperature determinations in this benchmark cluster. Our technique utilizes colors from deep photometry in the I band and in two medium-band filters at {lambda}~753 and 770nm, which accurately measure the depth of a molecular feature present in the spectra of cool stars. From these colors we can derive effective temperatures with a precision corresponding to better than one-half spectral subtype, and importantly this precision is independent of the extinction to the individual stars. Also, because this technique utilizes only photometry redward of 750nm, the results are only mildly sensitive to optical veiling produced by accretion. Completing our census with previously available data, we place some 1750 sources in the Hertzsprung-Russell diagram and assign masses and ages down to 0.02M_{sun}_. At faint luminosities, we detect a large population of background sources which is easily separated in our photometry from the bona fide cluster members. The resulting initial mass function of the cluster has good completeness well into the substellar mass range, and we find that it declines steeply with decreasing mass. This suggests a deficiency of newly formed brown dwarfs in the cluster compared to the Galactic disk population.2012ApJ...748...14Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/748/14CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/207/10 : HST Treasury Program on the ONC (Robberto+, 2013)J/ApJ/733/50 : MIR phot. monitoring of the ONC (Morales-Calderon+, 2011)J/A+A/534/A10 : HST/NICMOS imaging in Orion Nebula Cluster (Andersen+, 2011)J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010)J/A+A/515/A13 : Very low mass objects in ONC (Rodriguez-Ledesma+, 2010)J/AJ/139/950 : JHKs photometry in ONC (Robberto+, 2010)J/ApJS/183/261 : Optical photometry of the ONC (Da Rio+, 2009)J/A+A/502/883 : I photometry of low mass ONC stars (Rodriguez-Ledesma+, 2009)J/MNRAS/400/603 : New variables in ONC (Parihar+, 2009)J/ApJ/677/401 : Xray properties of protostars in ONC (Prisinzano+, 2008)J/ApJ/671/605 : NGC 2264 and ONC PMS stars in the infrared (Cieza+, 2007)J/ApJ/660/1462 : Abundances of ONC X-ray PMS stars (Maggio+, 2007)J/AJ/134/2272 : Visual binaries in the Orion Nebula Cluster (Reipurth+, 2007)J/MNRAS/361/211 : JHK photometry of brown dwarfs in Orion (Lucas+, 2005)J/AJ/121/1676 : ONC low-mass stars photometry (Rebull+, 2001)J/ApJ/540/236 : KH photometry of Orion Nebula Cluster (Hillenbrand+, 2000)J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/748/14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/748/14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/748/14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/748/14https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/748/14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/748/14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/748/14/table3 (Derived stellar parameters of the ONC population)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/748/14/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/748/14/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/748/14/table3?GETtext/xml+votable180.050000true83.5629167-5.38333330.0055555555555555566/21438 21439 22804 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/748/14?format=asciidefaultJ/ApJ/748/14/table3Derived stellar parameters of the ONC populationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/1743] Source identification number (<[DRH2012] NNNN> in Simbad)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainlogT[3.42/4.26] Log of the effective temperaturelog(K)phys.temperature.effectivefloate_logT[0/0.17] Uncertainty in logTlog(K)stat.errorfloatlogL[-4.14/2.74] Log of the bolometric luminositylog(solLum)phys.luminosityfloate_logL[0/1.69] Uncertainty in logLlog(solLum)stat.errorfloatAv[-2/13.1] The V band extinctionmagphys.absorption;em.opt.Vfloate_Av[0.005/11.25] Uncertainty in Avmagstat.errorfloatu_M1[~] Approximate flag for M1meta.code.errorcharM1[0/1.4]? Mass using B98 models (1)solMassphys.massfloatnullablee_M1[0.001/0.4]? Uncertainty in M1solMassstat.errorfloatnullablel_logA1Limit flag on logA1meta.code.errorcharlogA1[6/9]? Log age using B98 models (1)log(yr)time.agefloatnullablee_logA1[0/0.7]? Uncertainty in logA1log(yr)stat.errorfloatnullableM2[0.02/3]? Mass using DM98 models (1)solMassphys.massfloatnullablee_M2[0/0.46]? Uncertainty in M2solMassstat.errorfloatnullablelogA2[3.63/8.97]? Log age using DM98 models (1)log(yr)time.agefloatnullablee_logA2[0.002/0.92]? Uncertainty in logA2log(yr)stat.errorfloatnullableppCross-match with Paper I (Cat. J/ApJS/183/261) and II (Cat. J/ApJ/722/1092) within 3"meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar