J/ApJ/688/L83ivo://CDS.VizieR/J/ApJ/688/L83doi:10.26093/cds/vizier.16889083CDSCernicharo J.Guelin M.Agundez M.McCarthy M.C.Thaddeus P.2011-02-14T14:11:40Z2011-01-25T14:34:08ZCDS support team

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

cds-question@unistra.frinterstellar-mediumradio-astronomycarbon-starsWe report the detection in the envelope of the C-rich star IRC+10216 of four series of lines with harmonically related frequencies: B1389, B1390, B1394, and B1401. The four series must arise from linear molecules with mass and size close to those of C_6_H and C_5_N. Three of the series have half-integer rotational quantum numbers; we assign them to the ^2^{Delta} and ^2^{Sigma}^-^ vibronic states of C_6_H in its lowest ({nu}_11_) bending mode. The fourth series, B1389, has integer J with no evidence of fine or hyperfine structure; it has a rotational constant of 1388.860(2)MHz and a centrifugal distortion constant of 33(1)Hz; it is almost certainly the C_5_N^-^ anion.2008ApJ...688L..83Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/688/L83CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/142/181 : 2mm molecular line survey of IRC+10 216 (Cernicharo+, 2000)J/ApJS/177/275 : 1.3 and 2mm survey of IRC+10216 (He+, 2008)J/ApJS/190/348 : 1mm spectral survey of IRC+10216 + VY CMa (Tenenbaum+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/688/L83https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/688/L83http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/688/L83https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/688/L83https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/688/L83http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/688/L83GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJ/688/L83/table1Observed line parameters in IRC+10216recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLineLine identification (1)meta.id;spect.lineTransTransitionmeta.id;phys.atmol.transitioncharFreqObserved frequencyMHzem.freqdoublee_FreqThe 1{sigma} uncertainty in FreqMHzem.freqfloatCFreqCalculated frequencyMHzem.freqdoubleTempIntegrated antenna temperature (2)K.km/sphot.antennaTempfloate_TempThe 1{sigma} uncertainty in TempK.km/sstat.errorfloatVexpLine width parameterkm/sspect.line.widthfloate_Vexp? The 1{sigma} uncertainty in Vexpkm/sstat.errorfloatnullablef_Vexp[a] Indicates Vexp has been fixedmeta.codechar