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The star Sirius, the brightest star in our northern skies,

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The star Sirius, the brightest star in our northern skies, has a white-dwarf
companion. Sirius has a mass of about 2 MSun and is still on the main sequence, while its companion is already a star corpse.
Remember that a white dwarf can’t have a mass greater than 1.4 MSun.

Assuming that the two stars formed at the same time, discuss with your group how Sirius could have a white-dwarf companion.

Hint: Was the initial mass of the white-dwarf star larger or smaller than that of Sirius?

 
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