AST201H1 Lecture Notes - Lecture 7: Binary Star, Minute And Second Of Arc, Cecilia Payne-Gaposchkin
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Stars at the middle-bottom, like the sun, have more time. Above main sequence is giants and super giants. Parallax angle depends on distence ex) half size of a jump = 2 times as big distence. Theres an inverse relationship ex) jump twice as big, is half the distance. Use a right angle triangle and pygathorem to see hwo far it is. Theres a huge range of brightness of the stars. If you double the temp of a star, it will be 16 times brighter and bluer. And how hot the star is from how much energy is released. Annie jump cannon and the calculatos at harvard laid the foundation of modern stellar classification. Cecilia payne gaposchkin would later demostrate that the spectral sequence is actually a sequence in temperature. Hottest o b a f g k m coolest. *about half of all stars are in binary systems. Brightness goes down by the square of the distance.