J/A+A/513/A53ivo://CDS.VizieR/J/A+A/513/A53doi:10.26093/cds/vizier.35130053CDSLadjal DJusttanont K.Groenewegen M.A.T.Blommaert J.A.D.L.,Waelkens C.Barlow M.J.2021-08-16T06:39:05Z2010-05-11T15:18:27ZCDS support team

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

cds-question@unistra.frsupergiant-starsmillimeter-astronomysubmillimeter-astronomyDuring their evolution, Asymptotic Giant Branch (AGB) stars experience a high mass-loss which leads to the formation of a circumstellar envelope (CSE) of dust and gas. The mass loss process is the most important phenomenon during this evolutionary stage. In order to understand it, it is important to study the physical parameters of the CSE. The emission of the CSE in the (sub)millimetre range is dominated by the dust continuum. This means that (sub)millimetre observations are a key tool in tracing the dust and improving our knowledge of the mass-loss process. We analysed new sub-millimetre observations of 9 evolved stars in order to constrain the CSE physical parameters. The data were taken by the new APEX bolometer LABoCa. The fluxes at 870 um are derived and the extended emission is investigated. We computed the spectral energy distribution (SEDs) with the 1D radiative transfer code DUSTY, which we compared to literature data. Grain properties were calculated with both a spherical grains distribution and a continuous distribution of ellipsoids (CDE), and a comparison between the two is drawn. Synthetic surface brightness maps were derived from the modelling and were compared to the LABoCa brightness maps. We detected the presence of extended emission around four stars. Physical parameters of the circumstellar envelope were derived from SED modelling, like the dust chemical composition, the dust condensation temperature and the total mass of the envelope.2010A&A...513A..53Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/513/A53CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/513/A53https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/513/A53http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/513/A53https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/513/A53https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/513/A53http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/513/A53GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/513/A53/objects (List of objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/513/A53/objects?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/513/A53/objects?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/513/A53/objects?GETtext/xml+votable180.050000true266.1-31.9263890.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/513/A536/4365 17716 18364 20022 28807 30664 39905 42757 46318https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/513/A53?format=asciiMillimeterdefaultJ/A+A/513/A53/objectsList of objectsNameObject namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainFileNameName of the FITS file, in "images" subdirectorymeta.id;meta.fitscharSimbadSimbad column added by the CDSmeta.ref.urlchar