In this paper
, I notice the use of
- does anyone know what this symbol means? I think it's an "effective radius" of sorts, but I can't figure out where it comes from.
I think it just means stellar radius.
Essentially, yes but with a major "but". In the paper they say it is the "hydrostatic radius"...which has some specifics, but it's basically a more mathematical / physics-y (read:consistent) way of describing a star's radius. The formality comes in because of asking "Is this the radius to surface of the star, somewhere inside?" This is actually a very interesting thing to think about: What is the surface of a star?
If I were to be very formal, I would suspect this is the the radius of the star out to "where we can observe most of the star's radiation"...which is somewhere pretty close to the surface. Can't guarantee I'm right, the original paper discussing the physics doesn't really mention this, but that's what I'd suspect anyway. Some other relevant radii I guess would be the core radius or the radius where winds come off of from the star, but those don't seem as directly relevant for what the paper was talking about.
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