ASTR 101 1st Edition Lecture 23 Outline of Last Lecture I Eclipsing Binary II HR diagram Outline of Current Lecture I Main sequence stars II Stars outside of main sequence III Star clusters Current Lecture HR diagram ctd I Main sequence stars a What is the significance of the main sequence these stars are relatively younger than other stars they re burning hydrogen into helium for nuclear reactions their cores are very hot It takes hundreds of thousands of years for the core to emit gamma rays b High mass and low mass stars c Sun s life expectancy 10 billion years II Stars outside of the main sequence stars that have consumed all of their hydrogen a Most massive stars produce super giants When the stars stop burning hydrogen they increase in size and become super giants and their temperature becomes lower makes sense b c the core has stopped burning b Giants and super giants are far larger than the main sequence stars and white dwarfs c A dead star is always the most stable star a dead star will not do much over the next 10 billion years III Star clusters a 2 types open loosely packed group of about 1000 stars and globular clusters up to 1 million stars clustered closely together b We can measure the age of a star cluster We assume that all of the stars in a globular cluster are the same age and then we test that These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute
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