I do not know how relevant or even meaningful this question is.
But I do have some confusion here.
If the mass of a burnt up star is equal to the Chandrasekhar Limit (around 1.4 times the solar mass) then nothing stops the Dwarf to collapse infinitely i.e. the radius becomes 0.
Also, in the case of a very massive star (say, mass of the burnt up star is as high as 10 times the solar mass) nothing stops the core to collapse to a black hole.
Then how are the above two invisible balls different?
May be I have some wrong conception here.
Any clarification?
Q