X-ray emission in the enigmatic CVSO 30 system S. Czesla, P. C. Schneider, M. Salz, T. Klocová, T. O. B. Schmidt and J. H. M. M. Schmitt A&A, 629 (2019) A5 Published online: 22 August 2019 DOI: 10.1051/0004-6361/201935351