Only about 10 % of variable cepheid stars can be found in clusters. This is one of the results of simulations created by czech astronomers. They furthermore revealed that if cepheid is found in a cluster it is likely a massive one.
Globular clusters M3 and M13
Cepheids
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Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.