J/A+A/610/A64ivo://CDS.VizieR/J/A+A/610/A64doi:10.26093/cds/vizier.36100064CDSVoirin J.Manara C.F.Prusti T.2018-03-15T09:18:43Z2018-03-02T16:22:04ZCDS support team

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

cds-question@unistra.fropen-star-clustersstellar-distanceeffective-temperaturestellar-spectral-typesThe determination of the distance to dark star-forming clouds is a key parameter to derive the properties of the cloud itself, and of its stellar content. This parameter is still loosely constrained even in nearby star- forming regions. We want to determine the distances to the clouds in the Chamaeleon-Musca complex and to explore the connection between these clouds and the large scale cloud structures in the galaxy. We use the newly estimated distances obtained from the parallaxes measured by the Gaia satellite and included in the Tycho-Gaia Astrometric Solution catalog. When known members of a region are included in this catalog we use their parallaxes to infer the distance to the cloud. Otherwise, we analyze the dependence of the color excess on the distance of the stars and look for a turn-on of this excess, which is a proxy of the position of the front-edge of the star-forming cloud. We are able to measure the distance to the three Chamaeleon clouds. The distance to Chamaeleon I is 179^+11+11^_-10-10_pc, where the quoted uncertainties are statistical and systematic uncertainties, respectively, 20 pc further away than previously assumed. The Chamaeleon II cloud is located at the distance of 181^+6+11^_-5-10_pc, which agrees with previous estimates. We are able to measure for the first time a distance to the Chamaeleon III cloud of 199^+8+12^_-7-11_pc. Finally, the distance of the Musca cloud is smaller than 603^+91+133^_-70-92_pc. These estimates do not allow us to distinguish between the possibility that the Chamaeleon clouds are part of a sheet of clouds parallel to the galactic plane, or perpendicular to it. We have measured a larger distance to the Chamaeleon I cloud than assumed in the past, confirmed the distance to the Chamaeleon II region, and measured for the first time the distance to the Chamaleon III cloud. These values are consistent with the scenario where the three clouds are part of a single large scale structure. Gaia Data Release 2 will allow us to put more stringent constraints on the distances to these clouds by giving us access to parallax measurements for a larger number of members of these regions.2018A&A...610A..64Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/610/A64CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/259 : The Tycho-2 Catalogue (Hog+ 2000)I/337 : Gaia DR1 (Gaia Collaboration, 2016)J/ApJ/833/119 : Distances of Gaia DR1 TGAS sources (Astraatmadja+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/610/A64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/610/A64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/610/A64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/610/A64https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/610/A64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/610/A64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/610/A64/table5 (Catalog of stars on the line of sight of Cha III)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/610/A64/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/610/A64/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/610/A64/table5?GETtext/xml+votable180.050000true184.36215694-80.585270.005555555555555556Cone search capability for table J/A+A/610/A64/table6 (Catalog of stars on the line of sight of Musca)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/610/A64/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/610/A64/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/610/A64/table6?GETtext/xml+votable180.050000true184.74434111-72.623026940.005555555555555556Cone search capability for table J/A+A/610/A64/table3 (Catalog of stars on the line of sight of Cha I)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/610/A64/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/610/A64/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/610/A64/table3?GETtext/xml+votable180.050000true160.86821611-76.580778060.005555555555555556Cone search capability for table J/A+A/610/A64/table4 (Catalog of stars on the line of sight of Cha II)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/610/A64/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/610/A64/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/610/A64/table4?GETtext/xml+votable180.050000true189.08850389-77.702071940.0055555555555555565/9238-9239 10274 10280 10283 6/36947 37128 41091 41100 41102 41124 41126-41127 41129 41131 41473 41476 41513 41515-41516 41518 416043.4014663096393355e-19 5.101838343667421e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/610/A64?format=asciidefaultJ/A+A/610/A64/table5Catalog of stars on the line of sight of Cha IIIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintA16Display the Astraatmadja et al. (2016, Cat. J/ApJ/833/119) datameta.ref.urlcharNameName of the field starmeta.id;meta.maincharRA_ICRSRight ascension (ICRS) at epoch 2015.0degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at epoch 2015.0degpos.eq.dec;meta.mainVTmagTycho V-Band magnitude (1)magphot.mag;em.opt.VfloatBTmagTycho B-Band magnitude (1)magphot.mag;em.opt.BfloatSpTypeSpectral type and luminosity classsrc.spTypecharTeff? Effective temperatureKphys.temperature.effectiveintnullableE(B-V)B-V colour excessmagphot.color.excessfloate_E(B-V)1 sigma uncertainty on E(B-V)magstat.errorfloatDistDistance from TGAS (2)pcpos.distance;pos.heliocentricinte_DistUncertainty on the distance from TGASpcstat.errorintRefReference for Sptype or Teff (3)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2015. (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015. (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/A+A/610/A64/table6Catalog of stars on the line of sight of MuscarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintA16Display the Astraatmadja et al. (2016, Cat. J/ApJ/833/119) datameta.ref.urlcharNameName of the field starmeta.id;meta.maincharRA_ICRSRight ascension (ICRS) at epoch 2015.0degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at epoch 2015.0degpos.eq.dec;meta.mainVTmagTycho V-Band magnitude (1)magphot.mag;em.opt.VfloatBTmagTycho B-Band magnitude (1)magphot.mag;em.opt.BfloatSpTypeSpectral type and luminosity classsrc.spTypecharTeff? Effective temperatureKphys.temperature.effectiveintnullableE(B-V)B-V colour excessmagphot.color.excessfloate_E(B-V)1 sigma uncertainty on E(B-V)magstat.errorfloatDistDistance from TGAS (2)pcpos.distance;pos.heliocentricinte_DistUncertainty on the distance from TGASpcstat.errorintRefReference for Sptype or Teff (3)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2015. (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015. (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/A+A/610/A64/table3Catalog of stars on the line of sight of Cha IrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintA16Display the Astraatmadja et al. (2016, Cat. J/ApJ/833/119) datameta.ref.urlcharNameName of the field starmeta.id;meta.maincharRA_ICRSRight ascension (ICRS) at epoch 2015.0degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at epoch 2015.0degpos.eq.dec;meta.mainVTmagTycho V-Band magnitude (1)magphot.mag;em.opt.VfloatBTmagTycho B-Band magnitude (1)magphot.mag;em.opt.BfloatSpTypeSpectral type and luminosity classsrc.spTypecharTeff? Effective temperatureKphys.temperature.effectiveintnullableE(B-V)B-V colour excessmagphot.color.excessfloate_E(B-V)1 sigma uncertainty on E(B-V)magstat.errorfloatDistDistance from TGAS (2)pcpos.distance;pos.heliocentricinte_DistUncertainty on the distance from TGASpcstat.errorintRefReference for Sptype or Teff (3)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2015. (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015. (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/A+A/610/A64/table4Catalog of stars on the line of sight of Cha IIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintA16Display the Astraatmadja et al. (2016, Cat. J/ApJ/833/119) datameta.ref.urlcharNameName of the field starmeta.id;meta.maincharRA_ICRSRight ascension (ICRS) at epoch 2015.0degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at epoch 2015.0degpos.eq.dec;meta.mainVTmagTycho V-Band magnitude (1)magphot.mag;em.opt.VfloatBTmagTycho B-Band magnitude (1)magphot.mag;em.opt.BfloatSpTypeSpectral type and luminosity classsrc.spTypecharTeff? Effective temperatureKphys.temperature.effectiveintnullableE(B-V)B-V colour excessmagphot.color.excessfloate_E(B-V)1 sigma uncertainty on E(B-V)magstat.errorfloatDistDistance from TGAS (2)pcpos.distance;pos.heliocentricinte_DistUncertainty on the distance from TGASpcstat.errorintRefReference for Sptype or Teff (3)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2015. (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015. (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed