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The star Sirius ( Canis Majoris) is actually a binary star in which the brighter, more massive ...

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The star Sirius ( Canis Majoris) is actually a binary star in which the brighter, more massive ...

The star Sirius ( Canis Majoris) is actually a binary star in which the brighter, more massive star (Sirius A) is an A-type main-sequence star and the fainter, less-massive star (Sirius B) is a white dwarf. How is this system most likely to have formed?
A)   Sirius A formed as a single star and later captured a passing white dwarf.
B)   Sirius B formed first and evolved to become a white dwarf; capture of gas and dust from interstellar clouds then resulted in the formation of Sirius A.
C)   Sirius B was initially more massive than Sirius A and evolved faster; it then became less massive due to mass loss to space and mass transfer to Sirius A.
D)   Sirius A was always the more massive of the two and became a red giant; then mass transfer to Sirius B accelerated the evolution of Sirius B and caused it to become a white dwarf.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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