(a star and what's gravitationally bound to it)
A star system (or stellar system)
is a star plus objects, gas, and dust
gravitationally bound to it. It includes one or more
stars (e.g., a binary star) plus the associated
The solar system is the Sun's star system.
Alpha Centauri is a system with multiple stars
and at least one planet (Proxima b) as well.
Algol (Beta Per)
double-line spectroscopic binary
Epsilon Indi (ε Indi)
post-common envelope binary (PCEB)
transit timing variations (TTV)