J/A+A/659/A134ivo://CDS.VizieR/J/A+A/659/A134doi:10.26093/cds/vizier.36590134CDSGallardo Cava I.Bujarrabal V.Alcolea J.Gomez-Garrido M.,Santander-Garcia M.2022-06-13T13:32:35Z2022-04-05T13:03:40ZCDS support team

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

cds-question@unistra.frgiant-starsmultiple-starsradio-spectroscopyThere is a class of binary post-asymptotic giant branch (post-AGB) stars that exhibit remarkable near-infrared excess. Such stars are surrounded by Keplerian or quasi-Keplerian disks, as well as extended outflows composed of gas escaping from the disk. This class can be subdivided into disk- and outflow-dominated sources, depending on whether it is the disk or the outflow that represents most of the nebular mass, respectively. The chemistry of this type of source has been practically unknown thus far. Our objective is to study the molecular content of nebulae around binary post-AGB stars that show disks with Keplerian dynamics, including molecular line intensities, chemistry, and abundances. We focused our observations on the 1.3, 2, 3mm bands of the 30mIRAM telescope and on the 7 and 13 mm bands of the 40m Yebes telescope. Our observations add up ~600 h of telescope time. We investigated the integrated intensities of pairs of molecular transitions for CO, other molecular species, and IRAS fluxes at 12, 25, and 60um. Additionally, we studied isotopic ratios, in particular ^17^O/^18^O, to analyze the initial stellar mass, as well as ^12^CO/^13^CO, to study the line and abundance ratios. We present the first single-dish molecular survey of mm-wave lines in nebulae around binary post-AGB stars. We conclude that the molecular content is relatively low in nebulae around binary post-AGB stars, as their molecular lines and abundances are especially weaker compared with AGB stars. This fact is very significant in those sources where the Keplerian disk is the dominant component of the nebula. The study of their chemistry allows us to classify nebulae around AC Her, the Red Rectangle, AI CMi, R Sct, and IRAS 20056+1834 as O-rich, while that of 89 Her is probably C-rich. The calculated abundances of the detected species other than CO are particularly low compared with AGB stars. The initial stellar mass derived from the ^17^O/^18^O ratio for the Red Rectangle and 89 Her is compatible with the central total stellar mass derived from previous mm-wave interferometric maps. The very low ^12^CO/^13^CO ratios found in binary post-AGB stars reveal a high ^13^CO abundance compared to AGB and other post-AGB stars.2022A&A...659A.134Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/659/A134CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/659/A134https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/659/A134http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/659/A134https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/659/A134https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/659/A134http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/659/A134GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/659/A134/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/659/A134/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/659/A134/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/659/A134/stars?GETtext/xml+votable180.050000true268.854958326.050.005555555555555556Cone search capability for table J/A+A/659/A134/list (List of spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/659/A134/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/659/A134/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/659/A134/list?GETtext/xml+votable180.050000true268.8549626.050.0055555555555555566/12948 21326 21931 22450 29935 30221 30498 31766 32181 32562https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/659/A134?format=asciiRadiodefaultJ/A+A/659/A134/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharRAJ2000Simbad right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad declination (J2000)pos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/659/A134/listList of spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of measurementsmeta.numberintObs.dateObservation datestime.epoch;obsnullablebFreqLower 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 fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar