Editing Stellar Structure

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*What is Sirius? What is its spectral class?  
 
*What is Sirius? What is its spectral class?  
 
*What is the seperation between Sirius and its WD companion?
 
*What is the seperation between Sirius and its WD companion?
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*Show that r is proportional to t^(2/5) in the Sedov phase of a supernova remnant
 
*How does the maximum mass of a WD made from hydrogen differ from one made of Carbon?
 
*How does the maximum mass of a WD made from hydrogen differ from one made of Carbon?
 
*For a star that loses its energy source and begin to collapse, how does its virialization time scale compare to its collapsing time scale?
 
*For a star that loses its energy source and begin to collapse, how does its virialization time scale compare to its collapsing time scale?

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