Questions related to the evolution of stars.

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Putting mass-luminosity relation and HS diagram together leads us to a mass-age relation; So how do stars lose their mass by time?

I think that the title is completely clear, but here's a short explain. I was just reading about Mass-luminosity relation that says massive stars are more luminous than tiny ones. Well, let's talk ...
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Black dwarf binary systems

I know black dwarf stars do not exist yet, and that they are what white dwarfs end up after a long time. The question is really simple: would it be possible to have a binary system in which one of the ...