astro chapter 19

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Author:
jarrettmoore
ID:
270706
Filename:
astro chapter 19
Updated:
2014-04-15 18:34:31
Tags:
astro
Folders:
astro
Description:
text astro chapter 19
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  1. stage 1: an interstellar cloud
    • can be tens of pc's across
    • temp around 10k
    • density 10^9
    • gets triggered by some event (stellar explosion, pressure wave, ext.)
    • shrinks and fragments into many collapsing fragments
    • takes a few million years
    • form many stars
  2. Stage 2: a collapsing cloud fragment
    • contains 1-2 solar masses at this stage
    • 100 times the size of our solar system
  3. kelvin-helmholtz contraction phase
    early evolution track onto the HR diagram from stage 3-4
  4. whats the difference in luminosity for stars with heavier elements and those with lighter
    stars with heavier elements tend to be cooler and darker
  5. brown dwarfes
    substellar objects with not enough mass to ignite nuclear fusion, frozen along the kelvin-helmholtz contraction phase.
  6. where to protostars shine most brightly
    IR
  7. protostellar winds
    gas can expand outward at velocites approaching 100km/s
  8. shock waves and star formation
    when a shock wave hits a cloud it races around the thinner exterior. Do not blast clouds from one direction, instead squeeze the cloud.
  9. generators of interstellar shock waves (5)
    • 1. relatively gentle deaths of old stars in the form of planetary nebulae
    • 2. supernova explosions
    • 3. sprial-arm waves that plow through the milky way
    • 4. interactions between galaxies
    • 5. emission nebulae

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