A binary star consists of two stars that are so close to each other in the sky that, seen from Earth, they are only a small angular distance apart. Often it also appears as if it is only one star. Binary stars form a physical unit and are gravitative coupled to each other, so they orbit a common center of gravity. The orbital times amount to a period of some days up to millennia. The velocities and the distance to each other change with the rhythm of the orbit time.
On the certificate and the star map, you will find the coordinates of the brighter main star. However, the companion's coordinates are almost identical because the stars are close together and appear to the human eye as a very bright star. That's how a binary star would look like if you zoom in with the help of our Stellarium software:
