J/A+A/634/A98ivo://CDS.VizieR/J/A+A/634/A98doi:10.26093/cds/vizier.36340098CDSGalli P.A.B.Bouy H.Olivares J.Miret-Roig N.Sarro L.M.Barrado D.,Berihuete A. Brandner W.2021-10-18T12:00:19Z2020-02-13T07:30:22ZCDS support team

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

cds-question@unistra.fropen-star-clustersproper-motionsvisible-astronomytrigonometric-parallaxradial-velocityCorona-Australis is one of the nearest regions to the Sun with recent and ongoing star formation, but the current picture of its stellar (and substellar) content is not complete yet. We take advantage of the second data release of the Gaia space mission to revisit the stellar census and search for additional members of the young stellar association in Corona-Australis. We applied a probabilistic method to infer membership probabilities based on a multidimensional astrometric and photometric data set over a field of 128deg^2^ around the dark clouds of the region. We identify 313 high-probability candidate members to the Corona-Australis association, 262 of which had never been reported as members before. Our sample of members covers the magnitude range between G>~5mag and G<~20mag, and it reveals the existence of two kinematically and spatially distinct subgroups. There is a distributed 'off-cloud' population of stars located in the north of the dark clouds that is twice as numerous as the historically known 'on-cloud' population that is concentrated around the densest cores. By comparing the location of the stars in the HR-diagram with evolutionary models, we show that these two populations are younger than 10Myr. Based on their infrared excess emission, we identify 28 Class II and 215 Class III stars among the sources with available infrared photometry, and we conclude that the frequency of Class~II stars (i.e. `disc-bearing' stars) in the on-cloud region is twice as large as compared to the off-cloud population. The distance derived for the Corona-Australis region based on this updated census is d=149.4^+0.4^_-0.4_pc, which exceeds previous estimates by about 20 pc. In this paper we provide the most complete census of stars in Corona-Australis available to date that can be confirmed with Gaia data. Furthermore, we report on the discovery of an extended and more evolved population of young stars beyond the region of the dark clouds, which was extensively surveyed in the past.2020A&A...634A..98Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/634/A98CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/634/A98https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/634/A98http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/634/A98https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/634/A98https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/634/A98http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/634/A98GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/634/A98/tablea1 (Properties of the 313 cluster members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/634/A98/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/634/A98/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/634/A98/tablea1?GETtext/xml+votable180.050000true275.177-37.02822220.0055555555555555565/11955-11956 11958 11960-11961 11963-11964 6/28737 28740-28741 47727 47738-47739 47741-47743 47805-47807 47811 47813-47815 47817-47819 47828 47830-47831 47839 47848-47849 47851 47860 47864 47867https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/634/A98?format=asciiOpticaldefaultJ/A+A/634/A98/tablea1Properties of the 313 cluster membersPopPopulationsrc.classchardDistancepcpos.distance;pos.heliocentricfloatprobMembership probabilitystat.probabilityfloatE_dUpper uncertainty for the distancepcstat.error;stat.maxfloate_dLower uncertainty for the distancepcstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Source identifier from Gaia-DR2 cataloguemeta.id;meta.mainRA_ICRSRight Ascension (ICRS) at Ep=2015.5pos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2015.5pos.eq.dec;meta.mainpmRAProper motion in right ascension, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRAProper motion in right ascension errormas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decfloate_pmDEProper motion in declination errormas/yrstat.error;pos.pm;pos.eq.decfloatplxParallaxmaspos.parallax.trigfloate_plxParallax errormasstat.error;pos.parallaxfloatVRAVelocity in right ascensionkm/sphys.velocfloatE_VRAVelocity in right ascension (upper uncertainty)km/sstat.error;stat.maxfloate_VRAVelocity in right ascension (lower uncertainty)km/sstat.errorfloatVDEVelocity in declinationkm/sphys.velocfloatE_VDEVelocity in declination (upper uncertainty)km/sstat.error;stat.maxfloate_VDEVelocity in declination (lower uncertainty)km/sstat.errorfloatYSOYSO subclasssrc.classcharSimbadSimbad 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.decnullableindexedJ/A+A/634/A98/tablea2Membership probabilities for all sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Source identifier from Gaia-DR2 cataloguemeta.id;meta.mainP050[0/1] membership probability for pin=0.5stat.probabilitydoubleP060[0/1] membership probability for pin=0.6stat.probabilitydoubleP070[0/1] membership probability for pin=0.7stat.probabilitydoubleP080[0/1] membership probability for pin=0.8stat.probabilitydoubleP090[0/1] membership probability for pin=0.9stat.probabilitydoubleJ/A+A/634/A98/tablea3Empirical isochronerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRPmagRP magnitude from Gaia-DR2magphot.mag;em.opt.RfloatG-RPG-RP color from Gaia-DR2magphot.color;em.opt;em.optfloat