J/A+A/537/A2ivo://CDS.VizieR/J/A+A/537/A2doi:10.26093/cds/vizier.35370002CDSMomany Y.Saviane I.Smette A.Bayo A.Girardi L.Marconi G.,Milone A.P.Bressan A.2018-01-05T08:57:06Z2012-04-18T15:15:37ZCDS support team

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

cds-question@unistra.frglobular-star-clustersinfrared-photometryhst-photometryThere is an ongoing debate regarding the onset luminosity of dusty mass loss in population-II red giant stars. We present VLT/VISIR mid-infrared (MIR) 8.6um imaging of 47 Tuc, the centre of attention of a number of space-based Spitzer observations and studies. The VISIR high-resolution (diffraction limited) observations allow excellent matching to existing optical Hubble Space Telescope catalogues. The optical-MIR coverage of the inner core of the cluster provide the cleanest possible blending-free sampling of the upper 3mag of the giant branch. Our diagrams show no evidence of faint giants with MIR-excess. A combined near/mid-infrared diagram additionally confirms the near absence of dusty red giants. Dusty red giants and asymptotic giant stars are confined to the 47 Tuc long-period variable population. In particular, dusty red giants are limited to the upper one N8.6um magnitude below the giant branch tip. This particular luminosity level corresponds to ~1000L_{sun}_, which was suggested in previous determinations to mark the onset of dusty mass loss. Interestingly, starting from this luminosity level we detected a gradual deviation between the colours of red giants and the theoretical isochrones.2012A&A...537A...2Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/537/A2CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/85/293 : HST Observations of core of 47 Tuc (de Marchi+ 1993)J/A+AS/106/161 : (V,I) photometry in NGC 6356 and 47 Tuc (Bica+ 1994)J/A+A/372/85 : Detected sources at 12{mu}m in 47 Tuc (Ramdani+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/537/A2https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/537/A2http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/537/A2https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/537/A2https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/537/A2http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/537/A2GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/537/A2/table3 (The VISIR N8.6um catalogue of the 47 Tuc central region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/537/A2/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/537/A2/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/537/A2/table3?GETtext/xml+votable180.050000true6.03575417-72.065230560.0055555555555555566/333211.549751481824461e-20 4.75565502943315e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/537/A2?format=asciiInfrareddefaultJ/A+A/537/A2/table3The VISIR N8.6um catalogue of the 47 Tuc central regionSeqSequential numbermeta.recordintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainF606WHST/ACS F606W magnitude (1)magphot.mag;em.opt.RfloatF814W? HST/ACS F814W magnitude (1)magphot.mag;em.opt.IfloatnullableF336W? HST/ACS F336W magnitude (2)magphot.mag;em.opt.UfloatnullableF435W? HST/ACS F435W magnitude (2)magphot.mag;em.opt.Bfloatnullable[8.6]? Magnitude in VISIR N8.6um magnitudemagphot.mag;em.IRfloatnullableJmag? ESO SOFI J magnitude (3)magphot.mag;em.IR.JfloatnullableKmag? ESO SOFI Ks magnitude (3)magphot.mag;em.IR.KfloatnullableFluxFlux value at 8.6umJyphot.mag;em.IR.8-15umfloatLPVKnown LPV identification (4)meta.idcharu_LPV[?] Uncertainty flag on LPV identificationmeta.code.errorcharSimbadSimbad column added by the CDSmeta.ref.urlchar