Re: Astrophysics question: main sequence evolution


Erik Max Francis wrote:

[luminosity change in lower-mass dwarfs]

My understanding is that this is one of the areas where there is
contention. The answer is probably, but it's hard to say. Some K and M
stars are fully convective, which makes modeling them more involved.
And, as you say, the Universe isn't old enough to have generated many of
these stars, so there's nothing to test theory against.

Well, there are some old late G dwarfs around... IMS the biggest stars
to have left the main sequence are late Gs? Which would have something
like two-thirds of a solar mass?


[lifespan]

So something like M^2.5 with your approximation.

So, double the mass, the luminosity goes up by ten or twelve times, the
lifespan drops to about a sixth. Very roughly.

Thank you!


Doug M.

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