The accelerating rotation of the magnetic He-weak star HD 142990

M. Shultz, Th. Rivinius, B. Das +2

HD 142990 (V 913 Sco; B5 V) is a He-weak star with a strong surface magnetic field and a short rotation period ($P_{\mathrm{rot}}\sim 1$ d). While it is clearly a rapid rotator, recent…