000002151 001__ 2151
000002151 005__ 20160706150008.0
000002151 0247_ $$2DOI$$a10.1051/0004-6361/201321117
000002151 037__ $$aASTROimport-308
000002151 100__ $$aMecina, M.
000002151 245__ $$aDusty shells surrounding the carbon variables S Scuti and RT Capricorni
000002151 260__ $$c2014
000002151 520__ $$aFor the Mass-loss of Evolved StarS (MESS) programme, the unprecedented spatial resolution of the PACS photometer on board the Herschel Space Observatory was employed to map the dusty environments of asymptotic giant branch (AGB) and red supergiant (RSG) stars. Among the morphologically heterogeneous sample, a small fraction of targets is enclosed by spherically symmetric detached envelopes. Based on observations in the 70 µm and 160 µm wavelength bands, we investigated the surroundings of the two carbon semiregular variables S Sct and RT Cap, which both show evidence for a history of highly variable mass-loss. S Sct exhibits a bright, spherically symmetric detached shell, 138″ in diameter and co-spatial with an already known CO structure. Moreover, weak emission is detected at the outskirts, where the morphology seems indicative of a mild shaping by interaction of the wind with the interstellar medium, which is also supported by the stellar space motion. Two shells are found around RT Cap that were not known so far in either dust emission or from molecular line observations. The inner shell with a diameter of 188″ shows an almost immaculate spherical symmetry, while the outer ~5' structure is more irregularly shaped. MoD, a modification of the DUSTY radiative transfer code, was used to model the detached shells. Dust temperatures, shell dust masses, and mass-loss rates are derived for both targets. Appendices are available in electronic form at http://www.aanda.org
000002151 700__ $$aKerschbaum, F.
000002151 700__ $$aGroenewegen, M. A. T.
000002151 700__ $$aOttensamer, R.
000002151 700__ $$aBlommaert, J. A. D. L.
000002151 700__ $$aMayer, A.
000002151 700__ $$aDecin, L.
000002151 700__ $$aLuntzer, A.
000002151 700__ $$aVandenbussche, B.
000002151 700__ $$aPosch, T.
000002151 700__ $$aWaelkens, C.
000002151 773__ $$cA69$$pAstronomy and Astrophysics$$v566$$y2014
000002151 85642 $$ahttp://esoads.eso.org/abs/2014A%26A...566A..69M
000002151 905__ $$apublished in
000002151 980__ $$aREFERD