J/A+A/600/A71ivo://CDS.VizieR/J/A+A/600/A71doi:10.26093/cds/vizier.36000071CDSDe NutteDecin L.Olofsson H.Lombaert R.de Koter A.Karakas A.,Milam S.Ramstedt S.Stancliffe R.J.Homan W.Van de Sande M.2017-06-29T08:56:20Z2017-03-31T07:41:24ZCDS support team

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

cds-question@unistra.frlate-type-starsradio-spectroscopyWe seek to investigate the ^17^O/^18^O ratio for a sample of AGB stars containing M-, S-, and C-type stars. These ratios are evaluated in relation to fundamental stellar evolution parameters: the stellar initial mass and pulsation period. Circumstellar ^13^C^16^O, ^12^C^17^O, and ^12^C^18^O line observations were obtained for a sample of nine stars with various singledish long-wavelength facilities. Line intensity ratios are shown to relate directly to the surface ^17^O/^18^O abundance ratio. Stellar evolution models predict the ^17^O/^18^O ratio to be a sensitive function of initial mass and to remain constant throughout the entire TP-AGB phase for stars initially less massive than 5 solar masses. This makes the measured ratio a probe of the initial stellar mass. Observed ^17^O/^18^O ratios are found to be well in the range predicted by stellar evolution models that do not consider convective overshooting. From this, accurate initial mass estimates are calculated for seven sources. For the remaining two sources, there are two mass solutions, although there is a larger probability that the low-mass solution is correct. Finally, we present hints at a possible separation between M/S- and C-type stars when comparing the ^17^O/^18^O ratio to the stellar pulsation period.2017A&A...600A..71Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/600/A71CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/600/A71https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/600/A71http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/600/A71https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/600/A71https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/600/A71http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/600/A71GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/600/A71/list (list of spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/600/A71/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/600/A71/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/600/A71/list?GETtext/xml+votable180.050000true297.6413332.914060.0055555555555555566/1727 4365 5273 13677 14457 18364 20022 22434 29877https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/600/A71?format=asciiRadiodefaultJ/A+A/600/A71/listlist of spectrarecnoRecord 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.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.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintspShow the spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory spmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitsSimbadSimbad column added by the CDSmeta.ref.urlchar