Long-term variations in the X-ray activity of HR 1099 V. Perdelwitz, F. H. Navarrete, J. Zamponi, R. E. Mennickent, M. Völschow, J. Robrade, P. C. Schneider, D. R. G. Schleicher and J. H. M. M. Schmitt A&A, 616 (2018) A161 Published online: 06 September 2018 DOI: 10.1051/0004-6361/201732222