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Unformatted text preview: Chapter 9 Notes • Low mass stars fade in billions of years • Medium mass star .8 to 8 solar masses form a planetary nebula and leave a white dwarf • High mass stars more than 8 solar masses: Supernovae and leave a neutron star and supernova remnants • Types of Supernovae • Novae (associated with a RG and WD binary system: The hydrogen gas on the surface of a WD violently explodes • Type 1A (asscociated with a RG and WD binary system: The WD explodes approaches the 1.4 solar mass WD is destroyed. Leaves supernova remnant, Spectra lacks hydrogen lines • Type 2 Core collapses of a high mass star (8 to 25 solar masses): Leaves a NS and a supernova remnant: Spectra contains hydrogen lines. • Neutron Stars are compact objects formed when the cores of a high mass stars, move more than 8 solar masses, collapse during the supernovae explosions • Most neutron stars are located inside of supernovae remnants • Cassiopeia A (Cas A), the youngest supernova remnant, 300 years old in the Milky has a NS in its...
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- Spring '08
- Supernova, White dwarf, Neutron star, solar masses