thedarkshade Posted April 17, 2009 Share Posted April 17, 2009 (edited) 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, 2009 by thedarkshade Link to comment Share on other sites More sharing options...
WhataBohr Posted April 19, 2009 Share Posted April 19, 2009 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 Link to comment Share on other sites More sharing options...
Klaynos Posted April 19, 2009 Share Posted April 19, 2009 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.... Link to comment Share on other sites More sharing options...
WhataBohr Posted April 20, 2009 Share Posted April 20, 2009 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 Link to comment Share on other sites More sharing options...
prateek Posted April 20, 2009 Share Posted April 20, 2009 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. Link to comment Share on other sites More sharing options...
thedarkshade Posted April 20, 2009 Author Share Posted April 20, 2009 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. Merged post follows: Consecutive posts mergedi 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 questionsThank you for this. I just downloaded it, and I'm going to read it right now. Link to comment Share on other sites More sharing options...
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