J/A+A/654/A122ivo://CDS.VizieR/J/A+A/654/A122doi:10.26093/cds/vizier.36540122CDSGalli P.A.B.Bouy H.Olivares J.Miret-Roig N.Sarro L.M.,Barrado D.Berihuete A.2022-12-31T10:10:28Z2021-10-22T10:04:51ZCDS support team

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

cds-question@unistra.frstellar-associationsopen-star-clustersstellar-distanceThe {chi}^1^ Fornacis cluster (Alessi 13) is one of a few open clusters of its age and distance in the Solar neighbourhood that ought to benefit from more attention as it can serve as a cornerstone for numerous future studies related to star and planet formation. Aims: We take advantage of the early installment of the third data release of the Gaia space mission in combination with archival data and our own observations, to expand the census of cluster members and revisit some properties of the cluster. Methods: We applied a probabilistic method to infer membership probabilities over a field of more than 1000deg^2^ to select the most likely cluster members and derive the distances, spatial velocities, and physical properties of the stars in this sample. Results: We identify 164 high-probability cluster members (including 61 new members) covering the magnitude range from 5.1 to 19.6mag in the G-band. Our sample of cluster members is complete down to 0.04M_{sun}_. We derive the distance of 108.4+/-0.3pc from Bayesian inference and confirm that the cluster is comoving with the Tucana-Horologium, Columba, and Carina young stellar associations. We investigate the kinematics of the cluster from a subsample of stars with measured radial velocities and we do not detect any significant expansion or rotation effects in the cluster. Our results suggest that the cluster is somewhat younger (about 30Myr) than previously thought. Based on spectroscopic observations, we argue that the cluster is mass-segregated and that the distribution of spectral types shows little variation compared to other young stellar groups. Conclusions: In this study, we deliver the most complete census of cluster members that can be done with Gaia data alone and we use this new sample to provide an updated picture on the 6D structure of the cluster.2021A&A...654A.122Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/654/A122CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/577/A148 : The Seven Sisters DANCe. I. Pleiades (Bouy+, 2015)J/MNRAS/460/2593 : Cygnus OB2 DANCe: Proper motion study (Wright+, 2016)J/A+A/625/A115 : Ruprecht 147 DANCe. I. (Olivares+, 2019)J/A+A/631/A57 : IC 4665 DANCe (Miret-Roig+, 2019)J/A+A/634/A98 : Corona-Australis DANCe. I. (Galli+, 2020)J/A+A/643/A148 : Lupus DANCe. Census and 6D structure with Gaia-DR2J/A+A/646/A46 : Chamaeleon DANCe. Stellar population with Gaia-DR2https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/654/A122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/654/A122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/654/A122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/654/A122https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/654/A122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/654/A122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/654/A122/tablea1 (Properties of the 164 cluster members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/654/A122/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/654/A122/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/654/A122/tablea1?GETtext/xml+votable180.050000true39.714375-34.95802780.005555555555555556Cone search capability for table J/A+A/654/A122/tablea4 (Physical properties of the cluster members with VOSA)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/654/A122/tablea4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/654/A122/tablea4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/654/A122/tablea4?GETtext/xml+votable180.050000true39.714375-34.95802780.0055555555555555565/8634 6/33750 33756 33781 33784 33787 33791 34334 34409-34411 34415 34444 34451 34455 34468 34472 34476 34481-34482 34487 34491 34493 34495 34497 34499 34504 34525-34526 34529-34530 34534 34540 34542 34546-34547 34552-34554 34701-34702 34707 34720 34730 34733 34737 34794 35161 35165 35197 35844 35854 35857 35860-35862 35873 35875 35882 35896 35904-35905 35907 35910-35911 35919 35924 35929 35934 35942 35944 35958 35965 35968 36096 36102 36104 36107 36115 36121-36122 36125 36132-36133 36148 36169 36171https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/654/A122?format=asciidefaultJ/A+A/654/A122/tablea1Properties of the 164 cluster membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaEDR3Gaia-EDR3 source identifiermeta.id;meta.mainONameOther name (alternative identifier)meta.idcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountpos.eq.decnullableindexedRA_ICRSRight ascension (ICRS) at Ep=2016.0pos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2016.0pos.eq.dec;meta.mainpmRAProper motion along right ascensionmas/yrpos.pm;pos.eq.rafloate_pmRAUncertainty of proper motion along right ascensionmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along declinationmas/yrpos.pm;pos.eq.decfloate_pmDEUncertainty of proper motion along declinationmas/yrstat.error;pos.pm;pos.eq.decfloatplxParallaxmaspos.parallax.trigfloate_plxUncertainty of parallaxmasstat.error;pos.parallaxfloatprob[0/1] Membership probability (from zero to one)stat.probabilityfloatRV? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RV? Uncertainty of radial velocitykm/sstat.errorfloatnullabler_RV[1/5]? Reference for radial velocity (1)meta.ref;pos.frameintnullableSpTypeSpectral typesrc.spTypecharr_SpType[1/5]? Reference for spectral type (2)meta.ref;pos.frameintnullabledDistancepcpos.distancefloatE_dUpper uncertainty of the distancepcstat.error;stat.maxfloate_dLower uncertainty of the distancepcstat.errorfloatUgal? U-velocity componentkm/sphys.veloc;pos.cartesian.xfloatnullableE_Ugal? Upper uncertainty of U-velocity componentkm/sstat.error;stat.maxfloatnullablee_Ugal? Lower uncertainty of U-velocity componentkm/sstat.errorfloatnullableVgal? V-velocity componentkm/sphys.veloc;pos.cartesian.yfloatnullableE_Vgal? Upper uncertainty of V-velocity componentkm/sstat.error;stat.maxfloatnullablee_Vgal? Lower uncertainty of V-velocity componentkm/sstat.errorfloatnullableWgal? W-velocity componentkm/sphys.veloc;pos.cartesian.zfloatnullableE_Wgal? Upper uncertainty of W-velocity componentkm/sstat.error;stat.maxfloatnullablee_Wgal? Lower uncertainty of W-velocity componentkm/sstat.errorfloatnullableSEDSED classificationmeta.code.class;src.classcharJ/A+A/654/A122/tablea4Physical properties of the cluster members with VOSArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaEDR3Gaia-EDR3 source identifiermeta.id;meta.mainRA_ICRSRight ascension (ICRS) at Ep=2016.0pos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2016.0pos.eq.dec;meta.main_RA.icrsRight ascension (ICRS) at Epoch=J2016. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2016. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.decnullableindexedTeffEffective temperatureKphys.temperature.effectiveinte_TeffUncertainty of effective temperatureKstat.error;phys.temperature.effectiveintLLogarithm of luminosity (in LSun)phys.luminosityfloatE_LUpper uncertainty of luminositystat.error;stat.maxfloate_LLower uncertainty of luminositystat.errordoubleJ/A+A/654/A122/tablea2Membership probabilities for all sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaEDR3Gaia-EDR3 source identifiermeta.id;meta.mainP050[0/1]? Probability derived from p_in=0.5 solution (prob_pin0p5)stat.fit.goodnessdoublenullableP060[0/1]? Probability derived from p_in=0.6 solution (prob_pin0p6)stat.fit.goodnessdoublenullableP070[0/1]? Probability derived from p_in=0.7 solution (prob_pin0p7)stat.fit.goodnessdoublenullableP080[0/1]? Probability derived from p_in=0.8 solution (prob_pin0p8)stat.fit.goodnessdoublenullableP090[0/1]? Probability derived from p_in=0.9 solution (prob_pin0p9)stat.fit.goodnessdoublenullableJ/A+A/654/A122/tablea3Empirical isochrone of the clusterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRPmagRP magnitude from Gaia-EDR3magphot.mag;em.opt.RdoubleG-RPG-RP colour from Gaia-EDR3magphot.color;em.opt;em.optdoubleGMAGAbsolute magnitude in G-bandmagphys.magAbsdoubleSpTypeSpectral typesrc.spTypechar