J/A+A/701/A242ivo://CDS.VizieR/J/A+A/701/A242doi:10.26093/cds/vizier/bc-nx/lcecCDSRigliaco E.Gratton R.Nascimbeni V.2026-08-03T06:57:18Z2025-09-19T08:49:55ZCDS support team

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

cds-question@unistra.fropen-star-clustersstellar-populationsstellar-distanceproper-motionsThe star-forming complex of Corona Australis (CrA) is one of the closest and most isolated molecular clouds. It belongs to a chain of clusters that show age gradients with distance from the galactic plane. We aim to provide suggestions regarding its formation history by examining the stellar and disk populations, the stellar multiplicity, and the interstellar absorption. We made a census of stars and disks using Gaia DR3 and infrared data. Interstellar absorption in the direction of each star was derived by comparing spectral types from the literature and Gaia colors. Stellar multiplicity analysis accounts for both direct observation of visual companions (Gaia data and high-contrast imaging) and indirect detection of the presence of companions (eclipsing binaries, spectroscopic binaries, and astrometry). The properties of the disks were obtained from the slopes of the spectral energy distributions. As found in previous studies, the CrA complex can be divided into two regions: a younger region (CrA-Main: 3+/-1Myr) and an older one (CrA-North: 6.7+/-0.3Myr), which are slightly younger than previously thought. Moreover, while CrA-Main still appears bound to the gas, CrA-North is unbound and expanding. The stars that belong to CrA-North were in the most compact configuration 3.72Myr ago. At that time, CrA-Main and CrA-North were also much closer to each other than they appear now. The fraction of disk-bearing stars is higher in CrA-Main than in CrA-North, as also expected due to the younger age of CrA-Main. We propose a formation history scenario for the CrA-complex. It started between 15 and 18Myr ago with supernovae (SNe) explosions in the Upper Centaurus-Lupus complex, followed by a quiescent phase with little star formation. A star formation episode ~7Myr ago formed CrA-North stars. About 3.7Myr ago, a second SN explosion south of CrA-North triggered star formation in CrA-Main. This last SN might have been the origin of the pulsar RX J1856.5-3754.2025A&A...701A.242Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/701/A242CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/701/A242https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/701/A242http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/701/A242https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/701/A242https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/701/A242http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/701/A242GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/701/A242/tableb1 (Designations, proper motion and distances of the 134 stars in CrA-Main and 308 stars in CrA-North)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/701/A242/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/701/A242/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/701/A242/tableb1?GETtext/xml+votable180.050000true282.5153333-36.39680560.0055555555555555565/11953 11955-11956 11958 11960-11961 11963-11964 6/28679 28684 28688 28690-28692 28695 28697 28701-28702 28736-28737 28739-28741 28743-28744 28749 47727 47739 47741-47743 47765 47767 47795 47798-47799 47802-47803 47805-47807 47811 47817-47819 47828 47830-47831 47839 47848-47849 47851 47860 47863-47864 478661.143914381504295e-19 1.2934455535160846e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/701/A242?format=asciidefaultJ/A+A/701/A242/tableb1Designations, proper motion and distances of the 134 stars in CrA-Main and 308 stars in CrA-NorthrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRunRun identification number or Pulsarmeta.idcharGroupBelonging groupmeta.idcharNameDesignationmeta.id;meta.maincharANameAlternative name(s)meta.idcharGaiaDR3? Gaia DR3 namemeta.idnullablepmRA? Proper motion along right ascensionmas/yrpos.pm;pos.eq.rafloatnullablepmDE? Proper motion along declinationmas/yrpos.pm;pos.eq.decfloatnullableDist? Distancepcpos.distancefloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/A+A/701/A242/tableb2Stellar and disk properties of the CrA-Main and CrA-North starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRunRun identification numbermeta.idintSpTypeSpectral Typesrc.spTypecharMass? MasssolMassphys.massfloatnullablealpha? alpha disk indexspect.indexfloatnullableMdust? Dust mass of the disk in Earth masses(5.97236x10+24kg)phys.massfloatnullablelogAge? logarithm of the agelog(Myr)time.agefloatnullableAG? Extinction in G bandmagphys.absorptionfloatnullableBp-Rp? Bp-Rp colormagphot.color;em.opt.B;em.opt.RfloatnullableGmag? G-band magnitudemagphot.mag;em.optfloatnullableG-H? G-H colormagphot.color;em.opt;em.IRfloatnullableHmag? H-band magnitudemagphot.mag;em.IR.Hfloatnullable