Midterm 2 Review Questions with Answers

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Astronomy & Astrophysics
Stefan Mochnacki

02:51 Type 1 supernovae (white dwarf supernovae) tend to dim faster (first few weeks) and the luminosities decrease more gradually. Hydrogen isnt present in the spectral lines of white dwarf supernovae while type 2 should have several hydrogen spectral lines since it high mass stars have more hydrogen in its outer layers. Type 2 is also most often observed in elliptical galaxies while type 1 is most often observed in spiral galaxies. Type 1 supernovae usually dont leave behind a remnant while type 2 supernovae usually leaves either nothing, a neutron star or a black hole. Supernova type 1: white dwarf binary star system- engulfing chemicalsgas released by binary star and since the mass > 1.4Msun it cant be supported by the electron degeneracy pressure Supernova type 2: core collapse of a high-mass star-once iron is reached in the core, no pressure so it contracts and cools (gravity wins over pressure), overcomes electron degeneracy pressure (electron capture e+p neutrons and neutrinos). Meanwhile, the outer layers of the star is rushing at 20% speed of light and hits a stationary ball of neutrons supernovae Star-gas-star cycle is the ongoing galactic recycling of remnant materials. Chemicals released from supernovae (high-mass stars) or stellar wind created bubbles of hot gas blown from high-mass stars, stellar winds from low-mass stars arou
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