Blue stars do not live a long time. The hotter a star, the faster it uses it's fuel. Blue stars are giants and super-giants. Red giants are physically large, but not nearly as massive as blue stars. They are bloated, distended envelopes and represent the last stages of a star's life before core collapse and transformation into a white dwarf or neutron star. If Erik is right and there are two types of globular (disk and halo), then I suspect the amount of gas in each is radically different. Very little gas in older globulars, so no new star formation. On Thu, Jun 11, 2009 at 10:48 AM, Joe Bauman <josephmbauman@yahoo.com>wrote:
This makes me wonder if one of my basic assumptions is wrong. I thought all globulars were extremely ancient. But could a population of blue stars be as old as red ones? Can someone help me understand this? Thanks, Joe