Figure 2 : Colour–magnitude diagrams for stars in the fields with detected BLAPs.

From: Blue large-amplitude pulsators as a new class of variable stars

Figure 2

Large circles mark mean positions of the variables. Observed brightness and colour variations are roughly of the size of the blue circles. The new pulsators have significantly bluer colour than main-sequence stars of the same brightness, which form the left branch of the V-shaped structure.