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.
@article{arxiv.1005.2689,
title = {The detached dust shells of AQ And, U Ant, and TT Cyg},
author = {F. Kerschbaum and D. Ladjal and R. Ottensamer and M. A. T. Groenewegen and M. Mecina and J. A. D. L. Blommaert and B. Baumann and L. Decin and B. Vandenbussche and C. Waelkens and T. Posch and E. Huygen and W. De Meester and S. Regibo and P. Royer and K. Exter and C. Jean},
journal= {arXiv preprint arXiv:1005.2689},
year = {2015}
}
Comments
Letter accepted for publication on the A&A Herschel Special Issue