Vandor IV, a red giant and pulsar.
The Vandor system was an inhabited binary star system located in a remote part of the Milky Way Galaxy, consisting of a B class giant and a pulsar. This planetary system had at least four planets.
In 2349, the Vandor system was selected by Dr. Paul Manheim as the location for his experiments into time, as the dense gravity of the pulsar was vital for his work. He based his laboratory on a planetoid in the system, Vandor IV.
Fifteen years later, the starship USS Enterprise-D visited this system upon receiving a distress call from Jenice, the wife of Dr. Paul Manheim. The ship's crew rescued both survivors, and isolated the origin of the Manheim Effect. (TNG: "We'll Always Have Paris")
The location of the system was labeled by the planetoid Vandor IV in the starchart Data and Picard were studying in Stellar Cartography in 2371. (Star Trek Generations, display graphic)