Algol Paradox

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Algol Paradox
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Astronomy
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This is a vocabulary word in textbook Astronomy Essentials by Michele M. Montgomery, Ph.D that contains

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The labeling of both masses in this video is quite confusing as it seems to be contrary to what Carroll/Ostlie say is the norm in "An Introduction to Modern Physics", 2nd ed (p.658). There, they say that the primary star (M1) is the one that GAINS the mass in a semidetached system. Whereas, the secondary star (M2) is the one that expands and fills its Roche lobe and LOSES its mass. In this video it seems to have these labels reversed then reversed again! Quite confusing.

TurtlesWayDown