What is the unusual result of mass transfer in the Algol binary system?

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The Algol binary system is known for its mass transfer process, where the more massive star transfers its mass to the less massive companion. This process can lead to the formation of a helium white dwarf, which is unusual because typically white dwarfs are composed of carbon and oxygen. In the Algol system, the mass transfer occurs before the donor star can fuse helium into heavier elements, resulting in a helium white dwarf.

What Is the Unusual Result of Mass Transfer in the Algol