J/ApJ/690/837ivo://CDS.VizieR/J/ApJ/690/837doi:10.26093/cds/vizier.16900837CDSMilam S.N.Woolf N.J.Ziurys L.M.2018-01-02T13:42:52Z2011-03-07T13:12:08ZCDS support team

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

cds-question@unistra.frcarbon-starsgiant-starsradio-spectroscopyradio-astronomyspectroscopyA survey of the ^12^C/^13^C ratio toward circumstellar envelopes has been conducted at millimeter wavelengths using the facilities of the Arizona Radio Observatory (ARO). The ratios were obtained for a sample of 18 local C- and O-rich asymptotic giant branch and supergiant stars from observations of the ^12^C and ^13^C isotopologues of CO and CN, respectively. The J=1->0 transitions of both molecules were observed at {lambda}=3mm using the ARO 12m telescope, while the J=2->1 lines of the two species were measured using the ARO Sub-Millimeter Telescope (SMT) at {lambda}=1mm. The ^12^C/^13^C ratios were determined from the CO data by modeling both transitions simultaneously with a circumstellar radiative transfer code, which can account for the high opacities present in the emission from this species. In the case of CN, the hyperfine structure was used to evaluate opacity effects. Ratios obtained independently from CO and CN are in good agreement.2009ApJ...690..837Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/690/837CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/390/501 : Millimetre observations of carbon stars. I. (Groenewegen+,J/A+A/390/511 : Millimetre observations of carbon stars. II. (Groenewegen+,J/A+AS/107/445 : Envelopes of oxygen-rich AGB stars (Hashimoto, 1994)J/A+A/275/163 : Luminous Carbon stars in Galactic Plane (Kastner+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/690/837https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/690/837http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/690/837https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/690/837https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/690/837http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/690/837GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/690/837/table2 (Source parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/690/837/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/690/837/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/690/837/table2?GETtext/xml+votable180.050000true19.46520567.2319830.0055555555555555566/1238 1986 3735 4365 5273 6714 10960 13297 13677 14457 14674 16233 21523 23470 23606 23611 24501 25228 30265 30664 32562 39905 43890https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/690/837?format=asciiRadiodefaultJ/ApJ/690/837/table2Source parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_SourceSimbad column added by the CDSmeta.ref.urlcharSourceSource designationmeta.id;meta.maincharprimaryEl[CO=] Overabundant element, or = if C =~ Ophys.atmol.elementcharClassClass of star (AGB, supergiant, or proto-PN)meta.code.classcharRAB1950Hour of right ascension (B1950)pos.eq.ra;meta.mainDEB1950Degree of declination (B1950)pos.eq.dec;meta.mainC/OCarbon to Oxygen ratiophys.abundfloatr_C/O[cd] Origin of value (1)meta.ref;pos.framecharDistHeliocentric distancepcpos.distanceintLumLuminosity of starsolLumphys.luminosityintTeffEffective temperatureKphys.temperature.effectiveintn_Teff[b] indicates an assumed Teffmeta.notecharRadRadius of starcmphys.size.radiusdoubleMdotMass losssolMass/yrphys.mass.lossdoubleRefReferences (2)meta.refcharSimbadSimbad column added by the CDSmeta.refchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJ/690/837/table4Observed line parameters for CNIsoIsotopologuemeta.id;phys.molcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource designationmeta.id;meta.maincharRes[ef] Note when resolution differs from 1MHz (1)meta.notecharQNQuantum number label (F, F1, F2, J or N)meta.notecharQuUpper state quantum numberphys.atmol.qncharQlLower state quantum numberphys.atmol.qncharbl[bc] blended (b) or partially blended (c)meta.codecharl_Int[<~ ] Limit or approximate flag on Intmeta.code.errorcharInt? Intensity (2)Kspect.line.intensityfloatnullablee_Int? Error in IntKstat.errorfloatnullableu_delV[~ ] Approximate flag on delVmeta.code.errorchardelV? Linewidth {Delta}Vkm/sspect.line.widthfloatnullablee_delV? Error in delVkm/sstat.errorfloatnullableu_VLSR[~ ] Approximate flag on VLSRmeta.code.error;phys.veloc;pos.lsrcharVLSR? Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullablef_VLSR[d] d = Assumed value.meta.codechare_VLSR? Error in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullable