000002714 001__ 2714
000002714 005__ 20160701171709.0
000002714 037__ $$aASTROimport-871
000002714 100__ $$aTeyssier, D.
000002714 245__ $$aTime Variability of Molecular Line Emission in IRC +10216
000002714 260__ $$c2015
000002714 520__ $$aWe present the results of monitoring the molecular emission of the  C-rich AGB star IRC+10216 over 3 years with the Herschel Space  Observatory. Observations of rotational transitions of various  vibrational levels of CO, 13CO, CS, CCH, H2O, SiO, SiS,  SiC2, HCN and HNC have been collected with the HIFI, PACS and  SPIRE instruments over multiple epochs. The intensity monitoring  shows strong and periodic variations of most of the observed molecules, often with differential behavior depending on the  transition level (larger variation at higher J), and generally  enhanced modulations in the vibrational modes of some of these  molecules (e.g. HCN). These results show that the effect of IR  pumping through the different vibrational levels on the emergent  line profiles of a given transition can be really significant.  This implies that the IR radiation field of the circumstellar  envelope and its time variation has to be taken into account in  any radiative transfer model in order to derive accurately the   physico-chemical structure of the envelope. 
000002714 700__ $$a Cernicharo, J.
000002714 700__ $$a Quintana-Lacaci, G.
000002714 700__ $$a Agúndez, M.
000002714 700__ $$a Barlow, M. J.
000002714 700__ $$a Daniel, F.
000002714 700__ $$a De Beck, E.
000002714 700__ $$a Decin, L.
000002714 700__ $$a Garcia Lario, P.
000002714 700__ $$a Groenewegen, M. A. T.
000002714 700__ $$a Neufeld, D. A.
000002714 700__ $$a Pearson, J. C.
000002714 773__ $$c43$$pWhy Galaxies Care about AGB Stars III: A Closer Look in Space and Time$$v497$$y2015
000002714 85642 $$ahttp://esoads.eso.org/abs/2015ASPC..497...43T
000002714 905__ $$apublished in
000002714 980__ $$aNONREF