5 - Star Formation and Physics

5 - Star Formation and Physics - Star Formation and Physics...

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Trifd Nebula Star Formation and Physics o± Stars
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star cluster formation Orion Orion Nebula -- M42 450 pc distance M13 Globular cluster gravitational collapse of interstellar gas & dust cloud ==> star formation
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How to understand the workings of stars ?? take a stellar census , correlate properties of stars why are the properties restricted ? Sagittarius star Feld cluster stars at different dist. stars at same dist.
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Two primary stellar measurements : brightness => energy output if distance known and no absorption of photons Brightness = L / ( 4 π d 2 ) ==> Luminosity (L) = 4 π d 2 B color => surface temp. (T) of star hotter ==> bluer cooler ==> redder conservation of energy Fowing through spherical shells centered on star
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1) parallax -- angular shift of nearby star relative to more distant stars as earth orbits sun (1 parsec = distance at which parallax = 1 arcsec) 2) proper motion -- nearby stars appear to move faster (if all have similar velocities) & many other methods. or Fnd a sample of stars all w/ same distance (star cluster)
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5 - Star Formation and Physics - Star Formation and Physics...

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