That brighter Sirius A weighs 3 solar masses, but the white dwarf Sirius B is only about onesolar mass implies:

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The fact that Sirius A is three times more massive than Sirius B suggests that there may have been a transfer of mass from Sirius B to Sirius A at some point in the past, either through a stellar wind or through accretion in a binary system. This would cause Sirius A to become more massive while Sirius B lost mass, eventually evolving into a white dwarf. The fact that Sirius A is three times more massive than Sirius B suggests that the white dwarf may have been formed through mass transfer from Sirius A. This is a common scenario in binary star systems, where a more massive star can transfer material to its companion as it evolves and expands into a red giant. The material can then accumulate on the white dwarf, causing it to increase in mass. Eventually, the white dwarf may become so massive that it can no longer support its own weight and will collapse into a neutron star or black hole.

That Brighter Sirius a Weighs 3 Solar Masses, but the White