J/ApJ/825/38ivo://CDS.VizieR/J/ApJ/825/38doi:10.26093/cds/vizier.18250038CDSHinkle K.H.Lebzelter T.Straniero O.2017-12-22T05:32:19Z2016-10-10T09:23:59ZCDS support team

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

cds-question@unistra.frgiant-starschemical-abundancesinterstellar-mediuminfrared-astronomyspectroscopyCarbon and oxygen isotopic ratios are reported for a sample of 46 Mira and SRa-type variable asymptotic giant branch (AGB) stars. Vibration-rotation first and second-overtone CO lines in 1.5-2.5{mu}m spectra were measured to derive isotopic ratios for ^12^C/^13^C, ^16^O/^17^O, and ^16^O/^18^O. Comparisons with previous measurements for individual stars and with various samples of evolved stars, as available in the extant literature, are discussed. Models for solar composition AGB stars of different initial masses are used to interpret our results. We find that the majority of M-stars have main sequence masses <=2M_{sun}_ and have not experienced sizable third dredge-up (TDU) episodes. The progenitors of the four S-type stars in our sample are slightly more massive. Of the six C-stars in the sample three have clear evidence relating their origin to the occurrence of TDU. Comparisons with O-rich presolar grains from AGB stars that lived before the formation of the solar system reveal variations in the interstellar medium chemical composition. The present generation of low-mass AGB stars, as represented by our sample of long period variables (LPVs), shows a large spread of ^16^O/^17^O ratios, similar to that of group 1 presolar grains and in agreement with theoretical expectations for the composition of mass 1.2-2M_{sun}_ stars after the first dredge-up. In contrast, the ^16^O/^18^O ratios of present-day LPVs are definitely smaller than those of group 1 grains. This is most probably a consequence of the the decrease with time of the ^16^O/^18^O ratio in the interstellar medium due to the chemical evolution of the Milky Way. One star in our sample has an O composition similar to that of group 2 presolar grains originating in an AGB star undergoing extra-mixing. This may indicate that the extra-mixing process is hampered at high metallicity, or, equivalently, favored at low metallicity. Similarly to O-rich grains, no star in our sample shows evidence of hot bottom burning, which is expected for massive AGB stars.2016ApJ...825...38Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/825/38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (GCVS) (Samus+ 2007-2013)III/240 : Near-infrared spectra of MK standards (Wallace+ 1997-2002)J/MNRAS/437/195 : Super and massive AGB stars nucleosynthesis (Doherty+, 2014)J/A+A/548/A55 : C and O isotopic ratios in Arcturus and Aldebaran (Abia+ 2012)J/A+A/531/A88 : Optical spectra of 12 Miras (Uttenthaler+, 2011)J/ApJ/690/837 : CN and CO observations toward AGB stars (Milam+, 2009)J/A+A/384/925 : Compiled catalog of stellar data of Miras (Kharchenko+, 2002)J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)J/ApJS/111/445 : Spectra of normal stars in the K band (Wallace+ 1997)J/ApJS/105/419 : Spectral Atlas of Carbon Stars (Barnbaum+ 1996)http://fruity.oa-teramo.inaf.it/ : Full-network Repository of Updated Isotopichttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/825/38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/825/38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/825/38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/825/38https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/825/38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/825/38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/825/38/table2 (Isotopic ratios)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/825/38/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/825/38/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/825/38/table2?GETtext/xml+votable180.050000true6.008115838.57704280.0055555555555555566/592 1619 1892 1986 2694 2740 2994 3432 4355 4614 5647 8475 8532 9074 9258 11747 12137 13500 13813 14161 14457 14809 15170 15396 15449 16132 16233 16267 17192 17716 19293 20212 21050 21224 22333 22806 23471 24151 25228 30606 31292 31828 36320 43890 44018 44417https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/825/38?format=asciiInfrareddefaultJ/ApJ/825/38/table3CO {Delta}v=2 best linesIso-C[12/13] Carbon isotopephys.atmol.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigma[4001.7/6415.7] Wavenumber in vacuumcm**-1em.wavenumberdoublelambda[15582.5/24982.4] Wavelength in air; Angstroms0.1nmem.wldoubleIso-O[16/18] Oxygen isotopephys.atmol.numberintv1[2/12] Transition upper v valuephys.mol.qnintv0[0/9] Transition Lower v valuephys.mol.qnintTB[PR] Transition Branchmeta.id;phys.atmol.transitioncharJ0[0/111] Transition lower J valuestat.value;stat.minintN[3/30] Number of spectra usedmeta.numberintJ/ApJ/825/38/table4CO {Delta}v=3 best linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigma[4001.7/6415.7] Wavenumber in vacuumcm**-1em.wavenumberdoublelambda[15582.5/24982.4] Wavelength in air; Angstroms0.1nmem.wldoubleIso-C[12/13] Carbon isotopephys.atmol.numberintIso-O[16/18] Oxygen isotopephys.atmol.numberintv1[2/12] Transition upper v valuephys.mol.qnintv0[0/9] Transition Lower v valuephys.mol.qnintTB[PR] Transition Branchmeta.id;phys.atmol.transitioncharJ0[0/111] Transition lower J valuestat.value;stat.minintN[3/30] Number of spectra usedmeta.numberintJ/ApJ/825/38/table2Isotopic ratiosTypeStellar typesrc.classcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStellar identifiermeta.id;meta.maincharPer[143/557] Period from the GCVSdtime.periodintu_PerUncertainty flag on Permeta.code.errorcharPhase1[0/1]? Phase in the first observationmeta.notefloatnullablePhase2[0.3/0.8]? Phase in the second observationmeta.notefloatnullablef_Phase1[:m] Flag on Phase 1 (1)meta.codecharT1[2400/3800]? Temperature in the first observationKphys.temperatureintnullableT2[2600/3200]? Temperature in the second observationKphys.temperatureintnullable12C/13C[8/224]? The ^12^C to ^13^C isotopic ratiophys.abundintnullableu_12C/13CUncertainty flag on 12C/13Cmeta.code.errorchare_12C/13C[2/130]? Error in 12C/13Cstat.errorintnullablel_16O/17OLimit flag on 16O/17Ometa.code.errorchar16O/17O[100/4467]? The ^16^O to ^17^O isotopic ratiophys.abundintnullableu_16O/17OUncertainty flag on 16O/17Ometa.code.errorchare_16O/17O[30/1100]? Error in 16O/17Ostat.errorintnullablel_16O/18OLimit flag on 16O/18Ometa.code.errorchar16O/18O[71/5623]? The ^16^O to ^18^O isotopic ratiophys.abundintnullableu_16O/18OUncertainty flag on 16O/18Ometa.code.errorchare_16O/18O[25/2500]? Error in 16O/18Ostat.errorintnullablef_16O/18O[a] a = Ratio based on a single linemeta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from SIMBAD (right ascension part)degpos.eq.ra;meta.main_DEPosition from SIMBAD (declination part)degpos.eq.dec;meta.main