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lecture5 - Star Formation and Physics of Stars! Orion! Star...

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Trifd Nebula Star Formation and Physics o± Stars Star cluster ±ormation Orion Orion Nebula -- M42 450 pc distance M13 Globular cluster Gravitational collapse o± interstellar How to understand the workings o± stars ?? Take a stellar census , correlate properties o± stars why are the properties restricted ? Sagittarius star feld cluster stars at different dist. stars at same dist. Two primary stellar measurements : brightness => energy output i± distance known and no absorption o± photons Brightness = L / ( 4 ! d 2 ) ==> Luminosity (L) = 4 ! d 2 B color => sur±ace temp. (T) o± star hotter ==> bluer cooler ==> redder conservation o± energy ²owing through spherical shells centered on star
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Distance ? 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)
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lecture5 - Star Formation and Physics of Stars! Orion! Star...

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