Hey guys,

 

I was discussing with a friend about the evolution of stars, our sun especially. It's now absolutely well known that the radius of a star when it turns into a red giant is increased a lot, but he asked me whether there is a formula or any other way using which you can calculate this radius increase yourself. Of course there must be some way, and I couldn't answer him.

 

So is there a formula, or other way so you can calculate yourself what the radius of our sun (for example) will increase when it turns into a Red Giant?

 

Regards,

shade

Edited April 17, 200916 yr by thedarkshade

for what i remember a star will go to a red giant dependant on it mass(.5-10 solar masses) but i suggest maybe looking the Hertzsprung - Russell diagram to help in the evolution of stars it may be helpful

I believe there is such an equation, I'll have to check some notes from a while ago, which I can't do right now... but I've written myself a note....

i read a while back about red giants expansions based on mass, luminosity and graviation... Called " On winds of giants to binary systems by A.Frankowski..... it will should anwser your questions

It has been estimated that our sun will grow big enough to swallow mercury and venus and temp. on earth wud be enough to melt lead.

for what i remember a star will go to a red giant dependant on it mass(.5-10 solar masses) but i suggest maybe looking the Hertzsprung - Russell diagram to help in the evolution of stars it may be helpful

I've had the same idea too, but so far I haven't come across any H-R diagram that would show the relation mass-radius.

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i read a while back about red giants expansions based on mass, luminosity and graviation... Called " On winds of giants to binary systems by A.Frankowski..... it will should anwser your questions

Thank you for this. I just downloaded it, and I'm going to read it right now.