UX Ori type variables

Artist drawing of the dusty environment around a young stellar object. 

Planets are believed to form in these environments when stars are relatively young. 

Image credit: NASA

Named after the prototype of the class, UX Ori type variables (commonly called UXOrs) are intermediate mass, pre-main sequence Herbig Ae/Be stars. The light curves of these stars show Algol-like fadings of 1 magnitude or more in random intervals of days to weeks. These fadings are accompanied by a change in color and are thought to be caused by non-uniform dust structure around the star.

AAVSO 3000 day light curve of UX Ori