[kingu]

Two stars were previously known... Polaris A and Polaris B, the companion star. The Hubble apparently picked up light from a third star, that of Polaris Ab which is just barely visible when looking at Polaris A - a binary star system.

As for orbiting stars - if Jupiter were slightly bigger, this system might have formed as a binary.

[wafflehouse]

wellll.. 10 times bigger.. give or take.. :-)