J/MNRAS/440/631ivo://CDS.VizieR/J/MNRAS/440/631doi:10.26093/cds/vizier.74400631CDSJones O.C.Kemper F.Srinivasan S.McDonald I.Sloan G.C.,Zijlstra A.A.2024-08-09T20:14:42Z2015-04-16T13:49:00ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsgiant-starsinfrared-photometrysupergiant-starsstellar-mass-lossIn order to determine the composition of the dust in the circumstellar envelopes of oxygen-rich asymptotic giant branch (AGB) stars, we have computed a grid of MODUST radiative-transfer models for a range of dust compositions, mass-loss rates, dust-shell inner radii and stellar parameters. We compare the resulting colours with the observed oxygen-rich AGB stars from the SAGE-Spec Large Magellanic Cloud (LMC) sample, finding good overall agreement for stars with a mid-infrared excess. We use these models to fit a sample of 37 O-rich AGB stars in the LMC with optically thin circumstellar envelopes, for which 5-35{mu}m Spitzer infrared spectrograph (IRS) spectra and broad-band photometry from the optical to the mid-infrared are available. From the modelling, we find mass-loss rates in the range ~8x10^-8^-5x10^-6^M_{sun}_/yr, and we show that a grain mixture consisting primarily of amorphous silicates, with contributions from amorphous alumina and metallic iron, provides a good fit to the observed spectra. Furthermore, we show from dust models that the AKARI [11]-[15] versus [3.2]-[7] colour-colour diagram is able to determine the fractional abundance of alumina in O-rich AGB stars.2014MNRAS.440..631Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/440/631CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)J/PASP/122/683 : SAGE-Spec Spitzer legacy program (Kemper+, 2010)J/MNRAS/411/1597 : LMC point source classification in SAGE-Spec (Woods+, 2011)J/MNRAS/427/3209 : Galactic and SMC O-AGBs and RSGs stars (Jones+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/440/631https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/440/631http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/440/631https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/440/631https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/440/631http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/440/631GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/440/631/table2 (The best-fitting model results for the spectra and photometry of the O-AGB sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/440/631/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/440/631/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/440/631/table2?GETtext/xml+votable180.050000true72.39327-69.096990.005555555555555556Cone search capability for table J/MNRAS/440/631/tablea1 (Spectral classification and photometric catalogue of all the O-rich sources used in this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/440/631/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/440/631/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/440/631/tablea1?GETtext/xml+votable180.050000true69.338105-70.5790450.0055555555555555565/8269 8273-8275 8280 6/33037 33047 33052-33054 33073 33080-33081 33089-33091 33107 33110 33112-33113 33115 33124-33125 33127 33137 37538 37544 375467.665958069654821e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/440/631?format=asciiInfrareddefaultJ/MNRAS/440/631/table2The best-fitting model results for the spectra and photometry of the O-AGB samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination sign (J2000)degpos.eq.dec;meta.mainSSIDSAGE-Spec identificationmeta.idintn_SSID[*] Note (1)meta.notecharSpTypeMK spectral typesrc.spTypecharMbolBolometric magnitudemagphys.magAbs.bolfloate_Mbolrms uncertainty on Mbolmagstat.errorfloatRinDust shell inner radius (in stellar radii)phys.angSize;srcfloate_Rinrms uncertainty on Rin (in stellar radii)stat.errorfloatdM/dtMass-loss ratesolMass/yrarith.ratedoublee_dM/dtrms uncertainty on dM/dtsolMass/yrstat.errordoubleAlxFractional abundance of alumina%phys.abundinte_Alxrms uncertainty on Alx%stat.errorintrchi2RBest-fit model chi2/data pointstat.fit.chi2floatrchi2NoA? Best-fit model without an alumina dust component chi2/data pointstat.fit.chi2floatnullableJ/MNRAS/440/631/tablea1Spectral classification and photometric catalogue of all the O-rich sources used in this studySimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintfitindicates best-fitting model results in table2meta.ref.urlcharSSID[1/4814] SSID identification number (SAGE-Spec designation)meta.idintprimarySpCSpectroscopic classification: O-AGB or RSG (2)meta.code.classcharJmag2MASS J magnitude (1)magphot.mag;em.IR.JfloatHmag2MASS H magnitude (1)magphot.mag;em.IR.HfloatKmag2MASS K magnitude (1)magphot.mag;em.IR.Kfloat[3.6]? IRAC 3.6um magnitude (1)magphot.mag;em.IR.3-4umfloatnullable[4.5]IRAC 4.5um magnitude (1)magphot.mag;em.IR.4-8umfloat[5.8]IRAC 5.8um magnitude (1)magphot.flux.density;em.IR.4-8umfloat[8.0]IRAC 8.0um magnitude (1)magphot.flux.density;em.IR.8-15umfloat[24]? MIPS 24um magnitude (1)magphot.flux.density;em.IR.15-30umfloatnullableW1mag? WISE W1 magnitude (1)magphot.mag;em.IR.3-4umfloatnullableW2mag? WISE W2 magnitude (1)magphot.mag;em.IR.4-8umfloatnullableW3mag? WISE W3 magnitude (1)magphot.flux.density;em.IR.8-15umfloatnullableW4mag? WISE W4 magnitude (1)magphot.flux.density;em.IR.15-30umfloatnullableN3mag? AKARI N3 (3.27um) magnitude (1)magphot.mag;em.IR.3-4umfloatnullableS7mag? AKARI S7 (7.31um) magnitude (1)magphot.flux.density;em.IR.4-8umfloatnullableS11mag? AKARI S11 (10.95um) magnitude (1)magphot.flux.density;em.IR.8-15umfloatnullableL15mag? AKARI L15 (16.16um) magnitude (1)magphot.flux.density;em.IR.8-15umfloatnullableL24mag? AKARI L24 (23.35um) magnitude (1)magphot.flux.density;em.IR.15-30umfloatnullable_RAPosition from SAGE-Spec DR 3 (source SSID 4142 is missing) (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition from SAGE-Spec DR 3 (source SSID 4142 is missing) (declination part)degpos.eq.dec;meta.mainnullable