Trialus

Trialus was the primary of the Trialus star system. This system was located in the Gamma Quadrant.

While in orbit of Meridian, the USS Defiant launched a probe into the star's corona. Probe telemetry revealed that the fusion reactants in the sun's core were out of balance, creating a cascade reaction on the quantum level which caused Meridian to shift between dimensions. (DS9: "Meridian")

The star's name was from StarTrek.com. [1]^(X) In the episode, it was not given a name and was described as the "Meridian sun". In the script, the star was called the Trialan sun. [2]