On the nature of M 28 V7.

It has recently been suggested that V7 in NGC 6626 (M28) may be one of the few known cataclysmic variables in a globular cluster. The authors have obtained the spectrum of the object, and find it instead to be near type M5 III, and thus probably a normal Mira variable. However, if V7 is indeed a member of the cluster (which is far from certain), then it proves to be very interesting for an entirely different reason: it would represent the first high-amplitude Mira variable in a moderately metal-poor cluster.