J/AJ/124/1001ivo://CDS.VizieR/J/AJ/124/1001doi:10.26093/cds/vizier.51241001CDSCarpenter J.M.Hillenbrand L.A.Skrutskie M.F.Meyer M.R.2023-04-06T16:50:50Z2003-01-04T16:41:48ZCDS support team

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

cds-question@unistra.fropen-star-clustersvariable-starspre-main-sequence-starsinfrared-photometryWe present the results of a J, H, and Ks photometric monitoring campaign of a 0.72{deg}x6{deg} area centered on the Chamaeleon I star-forming region. Data were obtained on 15 separate nights over a 4 month time interval, from January to May 2000, using the Two Micron All Sky Survey south telescope. Out of a total of 34,539 sources brighter than the photometric completeness limits (J=16.0, H=15.2, and Ks=14.8), 95 exhibit near-infrared variability in one or more bands. The variables can be grouped into a population of bright, red objects that are associated with the Chamaeleon I association and a population of faint, blue variables that are dispersed over the full 6{deg} of the survey and are likely field stars or older pre-main-sequence stars unrelated to the present-day Chamaeleon I molecular cloud. Ten new candidate members of Chamaeleon I, including eight brown dwarf candidates, have been identified based on variability and/or near-infrared-excess emission in the J-H versus H-Ks color-color diagram. We also provide a compendium of astrometry and J, H, and Ks photometry for previously identified members and candidate members of Chamaeleon I.2002AJ....124.1001Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/124/1001CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/121/974 : JHK photometry in Cha I (Gomez+, 2001)J/AJ/121/2673 : 3{mu}m survey of the Chamaeleon I dark cloud (Kenyon+, 2001)J/A+A/357/219 : ISOCAM observations in Cha I. (Persi+, 2000)J/ApJ/445/280 : ROSAT survey of the Orion nebula region (Gagne+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/124/1001https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/124/1001http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/124/1001https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/124/1001https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/124/1001http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/124/1001GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/124/1001/table3 (Near-infrared variable stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/124/1001/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/124/1001/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/124/1001/table3?GETtext/xml+votable180.050000true165.86005611-78.387931940.005555555555555556Cone search capability for table J/AJ/124/1001/table4 (New candidate members of Chamaeleon I)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/124/1001/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/124/1001/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/124/1001/table4?GETtext/xml+votable180.050000true166.01777194-76.659153060.005555555555555556Cone search capability for table J/AJ/124/1001/table5 (Near-infrared photometry for previously identified Chamaeleon I members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/124/1001/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/124/1001/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/124/1001/table5?GETtext/xml+votable180.050000true163.0054167-77.16391670.0055555555555555565/9239 6/36946-36947 36951-36953 36955 37128-37129 37131-37132 37134https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/124/1001?format=asciiInfrareddefaultJ/AJ/124/1001/table3Near-infrared variable starsKsmagThe mean K_s_ band magnitudemagphot.mag;em.IR.KfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCHSMIdentification numbermeta.id;meta.mainintNamePreviously identified variable star namemeta.idcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainJmag? The mean J-band magnitudemagphot.mag;em.IR.JfloatnullableHmagThe mean H-band magnitudemagphot.mag;em.IR.Hfloate_Jmag? Observed photometric rms of Jmagmagstat.errorfloatnullablee_HmagObserved photometric rms of Hmagmagstat.errorfloate_KsmagObserved photometric rms of Ksmagmagstat.errorfloato_JmagNumber of quality photometric measurements in Jmagmeta.numberinto_HmagNumber of quality photometric measurements in Hmagmeta.numberinto_KsmagNumber of quality photometric measurements in Ksmagmeta.numberintVIStetson variability indexsrc.var.indexfloatJ/AJ/124/1001/table4New candidate members of Chamaeleon IrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCHSMSequential numbermeta.id;meta.mainintRAJ2000Right ascension in decimal degrees (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000.0)degpos.eq.dec;meta.mainJmagMean J magnitudemagphot.mag;em.IR.JfloatHmagMean H magnitudemagphot.mag;em.IR.HfloatKsmagMean Ks magnitudemagphot.mag;em.IR.Kfloate_JmagObserved rms uncertainty on Jmagmagstat.errorfloate_HmagObserved rms uncertainty on Hmagmagstat.errorfloate_KsmagObserved rms uncertainty on Ksmagmagstat.errorfloatVar[Yes] Variable ?meta.idcharExcess[Yes] JHKs excess ?meta.codecharNameOther namemeta.idcharJ/AJ/124/1001/table5Near-infrared photometry for previously identified Chamaeleon I membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCommonly adopted name of the Chamaeleon I membermeta.id;meta.maincharprimaryRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainJmag? The mean J-band magnitude (2)magphot.mag;em.IR.JfloatnullableHmag? The mean H-band magnitude (2)magphot.mag;em.IR.HfloatnullableKsmag? The mean K_s_ band magnitude (2)magphot.mag;em.IR.Kfloatnullablee_Jmag? Observed photometric rms of Jmagmagstat.errorfloatnullablee_Hmag? Observed photometric rms of Hmagmagstat.errorfloatnullablee_Ksmag? Observed photometric rms of Ksmagmagstat.errorfloatnullableo_Jmag? Number of quality photometric measurements in Jmagmeta.numberintnullableo_Hmag? Number of quality photometric measurements in Hmagmeta.numberintnullableo_Ksmag? Number of quality photometric measurements in Ksmagmeta.numberintnullableVI? Stetson variability indexsrc.var.indexfloatnullableYSOP1[0Y] Variable identified from this study or General Catalogue of Variable Stars (3)meta.codecharYSOP2[0Y] Contains H{alpha}, Pa{beta}, or Br{gamma} in emission (3)meta.codecharYSOP3[0Y?] Contains lithium in absorption (3)meta.codecharYSOP4[0Y] X-ray source (3)meta.codecharYSOP5[0Y] Contains an infrared excess (3)meta.codecharYSOP6[0Y] Far-infrared source (3)meta.codecharJ/AJ/124/1001/table6Cross identification of Chamaeleon I membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (one of the following designation)meta.id;meta.maincharprimaryCHSM? Identification number from this studymeta.idintnullableprimary[CCE98]Cambresy et al., 1998A&A...338..977C (1)meta.idcharGCVSGeneral Catalog of Variable Stars (<II/214>), see Lopez & Girard, 1990PASP..102.1018Lmeta.idcharW87Whittet et al., 1991MNRAS.249..319Wmeta.idcharSzSchwartz, 1977ApJS...35..161S (Sz NN)meta.idcharSHoffmeister, 1963VeSon...6....1H (SNNNN)meta.idcharHMHenize & Mendoza, 1973ApJ...180..115H (HM NN) (2)meta.idcharCHXRFeigelson et al., 1993ApJ...416..623F (CHXR NNA)meta.idcharCHXFeigelson & Kriss, 1989ApJ...338..262F (CHX NNA)meta.idcharHnHartigan, 1993AJ....105.1511H (Hn NNA)meta.idcharHJMHyland et al., 1982MNRAS.201.1095H and Jones et al., 1985AJ.....90.1191J (CN-NN, EN-NNA) (3)meta.idcharHBCHerbig Bell (1988, Cat. <V/73> Catalog (HBC NNN)meta.idcharP00Persi et al., 2000, <J/A+A/357/219> (ISO NNN) (4)meta.idcharKG2001Kenyon & Gomez, 2001, <J/AJ/121/2673> (KG NNN) (5)meta.idcharGK2001Gomez & Kenyon, 2001, <J/AJ/121/974> (GK NN) (6)meta.idcharOTS99Oasa et al., 1999ApJ...526..336O (OTS NN) (7)meta.idcharB84Baud et al., 1984ApJ...278L..53B (BNNA) (8)meta.idcharIRASIRAS designation (HHMMm-DDMM)meta.idcharOtherOther namesmeta.idchar