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Transcript
The HR Diagram The Hertzsprung –HR Diagram • 90% of stars are found on a diagonal line called the main sequence • Hotter on the left cooler on the right • Brighter at top dimmer at bottom Russell diagram Groups of Stars • • • • Main sequence—diagonal line Red Giants– bright and cool Supergiants—brighter and cooler White Dwarfs—dim and hot Color and Stars Think of a candle • Hottest part is blue • Red is the cool part at the top Spectral Class • OBAFGKM • Oh Be A Fine Girl Kiss Me Annie J Cannon (1863-1941) • Indicates a stars composition All Types of Stars Recall Stars have Different colors which indicate different temperatures All Types of Stars Out Fiery Gases Many Red Oh! Beyond Be Oh! a Fine BeAndromeda, a Girl Fine- Girl Kiss- Me KissRight Me !NowKindle Sweetheart ! New Stars Star classification • If we look at a star with a spectroscope we see dark lines called absorption spectra • These lines indicate the stars chemical composition Absolute vs. Apparent Magnitude Absolute —how bright a star actually is Apparent—how bright it appears from Earth Revisit the HR diagram • Where are stars most of their lives? • Where are they when they begin to die? • What are they after they use up their fuel?
