rationalskepticism.org

newolder wrote:

DavidMcC wrote:

newolder wrote:If the star is "in the main sequence" (Hertzprung Russell) then it's not (yet) a white dwarf.

Do you not understand that even main sequence stars have modes of death, oftenending up as white dwarf? : doh:

I understand that some main sequence stars shed their outer layers during a red giant phase to become white dwarf stars. Do you now understand (as shown in the diagram) that white dwarf stars are not "in the main sequence"?

I always understood that, newolder. This is a side-track. The thread was meant to be about planets with oxygen but no life, remember? Now you've taken it into competely different territory, because of a different interpretation of the terminology.
To me, the main sequence should include the death phases of the star, even if they are not called "main sequence" any more.