Stars - Stars Photo of Andromeda Galaxy Hot stars- short...

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Stars Photo of Andromeda Galaxy Hot stars- short wavelengths, don’t last very long Colder Stars- longer wavelengths Spots – star formation galaxies where new stars are growing One New star each year within Milky Way Stellar Properties Apparent o Brightness Amount of starlight that reaches earth o Color o Location on sky Intrinsic o Luminosity The number of photons, usually measured in wavelength range Related to apparent brightness by the inverse square law As you go further away from the object the amount of energy decreases as the square of the distance Brightness and luminosity dependant on the square of the distance Luminosity = 4 pie (distance)2 x (brightness) Since brightness is an intrinsic property you can go measure it So D = square root (Lsun/4pieB) Energy in ergs = amount of energy it would take a fly to do a pushup o Temperature Temperature of a star provides a stellar fingerprint which can be used to identify a stars
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This note was uploaded on 03/16/2011 for the course ASTRO 2 taught by Professor Corcoran during the Spring '11 term at GWU.

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Stars - Stars Photo of Andromeda Galaxy Hot stars- short...

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