Astronomy Help?

Question

Describe what occurs at the stage of a white dwarf and what must occur for it to progress as well as on H-R Diagram???

Answer 1

Hi. White dwarfs are below the main sequence stars. They are stars at the end of their lives that contain a certain amount of material and no close neighbors. http://www.answers.com/main/ntquery?s=H-R%20Diagram&gwp=16 and : http://www.answers.com/main/ntquery?s=H-R%20Diagram&gwp=16

Answer 2

Stars burn hydrogen and when their temperature increases above a certain level, helium reactions will occur as well that leave carbon as a sort of ash. In larger stars, nuclear reactions will burn off the carbon as well, but in smaller stars, the nuclear reactions slowly burn out and without anything to counter gravity, the star will slowly begin to contract because of the carbon. As it shrinks, its density will increase, and with no reactions happening at the core, it's density becomes so great that any left over radiation is trapped and slowly trickles to the surface. Eventually this becomes what is known as a white dwarf. These stars still glow white because the radiation that escapes to the surface loses very little energy and take long periods of time to cool. They then continue to cool and at about 3000 degrees kelvin, they become red dwarfs (on the hr diagram) eventually, throughout billions of years it will finally "burn out" into a black dwarf.