The phrase "star system" refers to a group of stars that are connected and interact with each other. These stars can orbit around a common center or be closer to each other in space. It's like a family of stars that stick together! Full definition
There are few environments more extreme than a binary star system in which planet formation can occur. (sciencedaily.com)
A typical X-ray binary source consists of a close double star system in which one member is a very compact object. (britannica.com)
However, astronomers do not know exactly what determines how many stars will form together or what initial conditions determine the type of star system to develop. (sciencedaily.com)