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flag XRISM telescope confirms gamma-Cas X-rays come from magnetic white dwarf, not the star itself.

flag Astronomers have solved a 50-year mystery about gamma-Cas, a bright star in Cassiopeia, revealing that its intense X-rays come from a magnetic white dwarf companion, not the star itself. flag The XRISM telescope confirmed this by showing the X-ray emissions move in sync with the white dwarf's orbit. flag This discovery identifies gamma-Cas as a Be + white dwarf binary system, reshaping models of stellar evolution.

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