Probing the ejecta of evolved massive stars in transition - A VLT/SINFONI K-band surveyM. E. Oksala, M. Kraus, L. S. Cidale, M. F. Muratore and M. Borges FernandesA&A, 558 (2013) A17DOI: https://doi.org/10.1051/0004-6361/201321568