Prominences Map of V530 Per in 17 (upper-left),18 (upper-right), 22 (lower-left), 23 (lower-right) Oct. The inner, filledblue circle represents the stellar surface. Radial ticks inside this circle give the rotational phases of Hα observations. The outer dashed circle is the corotation radius. The color scale depicts the local Hα equivalent width, in units of picometers per 8 km s⁻¹ square pixel.