How did Sirius come from?

1844, German astronomer Bessel inferred that Sirius is a binary star according to the wave pattern appearing in its motion path, because the star moves along a wavy trajectory in the nearby space, and thus inferred that it has a companion star with an orbital period of about 50 years. This companion star was first seen by American astronomer A. Clark in 1862, using his homemade refractive telescope with the largest aperture of 4.7m at that time. Sirius and its companion star revolve around each other in an orbit with large eccentricity, with a period of 49.9 years, and the average distance is about 20 times that of the sun and the earth. Although the bright star shines brightly, it is not difficult to see the companion star with a large telescope. Its mass is similar to that of the sun, but its radius is only 1/50 of that of the sun, and its density is much higher than that of the sun, with an average density of 30㎏/ cm3. It is the first white dwarf discovered.