Rings and filaments: The remarkable detached CO shell of U Antliae F. Kerschbaum, M. Maercker, M. Brunner, M. Lindqvist, H. Olofsson, M. Mecina, E. De Beck, M. A. T. Groenewegen, E. Lagadec, S. Mohamed et al. (4 more) A&A, 605 (2017) A116 Published online: 20 September 2017 DOI: 10.1051/0004-6361/201730665