Chapter Summaries Chapter 13-14: Death of Stars - Bizarre Stellar Graveyard (don’t forget to find definitions at the end of the book, in the glossary and draw pictures!!!!!) 1. End of a star’s life : white dwarf (low mass star) neutron star/black hole (high mass star) 2. White dwarfs: the remaining cores of low mass dead stars the core has stopped gravitationally contracting; degeneracy pressure due to the electrons in the core counteracts gravity. mass is same as Sun and the size is about the same size as Earth higher mass white dwarfs are smaller (the more massive the smaller the star is) 3. White dwarf limit : white dwarf cannot be more massive than 1.4 M Sun because of quantum mechanics : known as Chandrasekhar limit 4. History of a star can change if it is part of a binary system Mass falling toward a white dwarf from its close binary companion has some angular Momentum - orbits white dwarf forms accretion disk 5. Nova: The temperature of accreted matter becomes hot enough for hydrogen fusion
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