2290 20160706142113.0 DOI 10.1051/0004-6361/201014633 ASTROimport-447 Kerschbaum, F. 2010 Detached circumstellar dust shells are detected around three carbon variables using Herschel-PACS. Two of them are already known on the basis of their thermal CO emission and two are visible as extensions in IRAS imaging data. By model fits to the new data sets, physical sizes, expansion timescales, dust temperatures, and more are deduced. A comparison with existing molecular CO material shows a high degree of correlation for TT Cyg and U Ant but a few distinct differences with other observables are also found. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Table 1 and Figs. 3 to 5 are only available in electronic form at http://www.aanda.org The detached dust shells of AQ Andromedae, U Antliae, and TT Cygni Ladjal, D. Ottensamer, R. Groenewegen, M. A. T. Mecina, M. Blommaert, J. A. D. L. Baumann, B. Decin, L. Vandenbussche, B. Waelkens, C. Posch, T. Huygen, E. De Meester, W. Regibo, S. Royer, P. Exter, K. Jean, C. L140 Astronomy and Astrophysics 518 2010 http://esoads.eso.org/abs/2010A%26A...518L.140K published in REFERD