Variable millimetre radiation from the colliding-wind binary Cygnus OB2 #8A R. Blomme, D. M. Fenech, R. K. Prinja, J. M. Pittard and J. C. Morford A&A, 608 (2017) A69 Published online: 08 December 2017 DOI: 10.1051/0004-6361/201731403