摘要: Stellar evolution theory predicts that at the upper limit of intermediate mass stars semidegenerate off-center or central carbon ignition occurs which produces oxygen-neon cores. These may after further growth accretion collapse due to electron captures effectively reduce Chandrasekhar limit. However loss envelope, either in single binaries, they survive and cool as O/Ne white dwarfs. I discuss range expected initial final masses view recent calculations for stellar consider evidence existence dwarfs: from Neon overabundances low X-ray binaries demonstrated by high resolution spectra Chandra observations other sources.
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