J/A+A/605/A116ivo://CDS.VizieR/J/A+A/605/A116doi:10.26093/cds/vizier.36050116CDSKerschbaum F.Maercker M.Brunner M.Lindqvist M.Olofsson H.,Mecina M.De Beck E.Groenewegen M.A.T.Lagadec E.Mohamed S.,Paladini C.Ramstedt S.Vlemmings W.H.T.Wittkowski M.2017-11-03T12:55:37Z2017-09-20T08:21:55ZCDS support team

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

cds-question@unistra.frcarbon-starsradio-astronomyco-line-emissionOur goal is to characterize the intermediate age, detached shell carbon star U Antliae morphologically and physically in order to study the mass-loss evolution after a possible thermal pulse. High spatial resolution ALMA observations of unprecedented quality in thermal CO lines allow us to derive first critical spatial and temporal scales and constrain modeling effects to estimate mass-loss rates for both the present day as well as the ejection period of the detached shell. The detached shell is remarkably thin, overall spherically symmetric, and shows a barely resolved filamentary substructure possibly caused by instabilities in the interaction zone of winds with different outflow velocities. The expansion age of the detached shell is of the order of 2700 years and its overall width indicates a high expansion-velocity and high mass-loss period of only a few hundred years at an average mass-loss rate of ~10^-5^M_{sun}_/yr. The post-high-mass-loss-rate-epoch evolution of U Ant shows a significant decline to a substantially lower gas expansion velocity and a mass-loss rate amounting to 4x10^-8^M_{sun}_/yr, at present being consistent with evolutionary changes as predicted for the period between thermal pulses.2017A&A...605A.116Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/605/A116CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/605/A116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/605/A116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/605/A116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/605/A116https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/605/A116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/605/A116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/605/A116/list (List of data cubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/605/A116/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/605/A116/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/605/A116/list?GETtext/xml+votable180.050000true158.80333-39.562620.0055555555555555566/38660https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/605/A116?format=asciiRadiodefaultJ/A+A/605/A116/listList of data cubesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of slicesmeta.numberintObs.DateObservation date 'YYYY-MM-DDThh:mm:ss.sss)time.epoch;obscharbFreqLower value of frequency intervalHzem.freq;stat.mindoubleBFreqUpper value of frequency intervalHzem.freq;stat.maxdoubledFreqFrequency resolutionHzspect.resolutionintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar