000002094 001__ 2094
000002094 005__ 20160701171658.0
000002094 0247_ $$2DOI$$a10.1093/mnras/stv1968
000002094 037__ $$aASTROimport-251
000002094 100__ $$aMcDonald, I.
000002094 245__ $$aALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae
000002094 260__ $$c2015
000002094 520__ $$aAtacama Large Millimetre Array observations show a non-detection of carbon monoxide around the four most luminous asymptotic giant branch (AGB) stars in the globular cluster 47 Tucanae. Stellar evolution models and star counts show that the mass-loss rates from these stars should be ˜1.2-3.5 × 10-7 M⊙ yr-1. We would naïvely expect such stars to be detectable at this distance (4.5 kpc). By modelling the ultraviolet radiation field from post-AGB stars and white dwarfs in 47 Tuc, we conclude that CO should be dissociated abnormally close to the stars. We estimate that the CO envelopes will be truncated at a few hundred stellar radii from their host stars and that the line intensities are about two orders of magnitude below our current detection limits. The truncation of CO envelopes should be important for AGB stars in dense clusters. Observing the CO (3-2) and higher transitions and targeting stars far from the centres of clusters should result in the detections needed to measure the outflow velocities from these stars. 
000002094 700__ $$a Zijlstra, A. A.
000002094 700__ $$a Lagadec, E.
000002094 700__ $$a Sloan, G. C.
000002094 700__ $$a Boyer, M. L.
000002094 700__ $$a Matsuura, M.
000002094 700__ $$a Smith, R. J.
000002094 700__ $$a Smith, C. L.
000002094 700__ $$a Yates, J. A.
000002094 700__ $$a van Loon, J. T.
000002094 700__ $$a Jones, O. C.
000002094 700__ $$a Ramstedt, S.
000002094 700__ $$a Avison, A.
000002094 700__ $$a Justtanont, K.
000002094 700__ $$a Olofsson, H.
000002094 700__ $$a Blommaert, J. A. D. L.
000002094 700__ $$a Goldman, S. R.
000002094 700__ $$a Groenewegen, M. A. T.
000002094 773__ $$c4324-4336$$i4$$pMonthly Notices of the Royal Astronomical Society$$v453$$y2015
000002094 85642 $$ahttp://esoads.eso.org/abs/2015MNRAS.453.4324M
000002094 905__ $$apublished in
000002094 980__ $$aREFERD