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Lesson 14 – Properties and Evolution of StarsIn this lecture we're going to look at the properties and evolution of stars. We'll look at the importantproperties of stars: we'll look at spectroscopic classification of stars – how we classify them intodifferent spectral types. We'll look at something called Hertzsprung­Russell Diagram, which is adiagram that helps to make sense of different types of stars. And we'll look at the evolution of stars –how stars change over time.Site:UNSW MoodleCourse:PHYS1160­Introduction to Astronomy T1 2017Book:Lesson 14 – Properties and Evolution of StarsPrinted by:Rachel YeeDate:Monday, 17 April 2017, 10:53 PM
Table of contents14. Properties and Evolution of Stars14.1 Basic Properties of Stars14.2 Luminosity and Distance14.3 Colour, Temperature and Spectroscopic Classification14.4 Spectral Classification ­ Some History14.5 Mass14.6 The Hertzprung­Russell Diagram14.7 Binaries, Variables and Star Clusters
14. Properties and Evolution of StarsSHOW WHOLE LESSON AS SINGLE WEB PAGEGO TO FIRST PAGELesson 14 Overview
14.1 Basic Properties of StarsIn this lesson we're going to look at the properties and evolution of stars. We'll look at the importantproperties of stars: we'll look at spectroscopic classification of stars – how we classify them intodifferent spectral types. We'll look at something called Hertzsprung­Russell Diagram, which is adiagram that helps to make sense of different types of stars. And we'll look at the evolution of stars –how stars change over time.Our Sun is one of billions of stars in our Galaxy. How do we make sense of this huge number of stars?Well, it helps to measure their basic properties and try and look for patterns that help us to classifythem.There are three important properties of stars:Mass:One important property is their mass – the total amount of material in the star. That turns out tobe a difficult property to measure.Luminosity:Another property is luminosity, that's the rate of energy production from a star or powerthe star puts out. We call very luminous stars giant and supergiant stars. Less luminous stars are dwarfstars.Colour or Temperature:Another property is their colour or temperature (which turn out to be related).Red stars are very cool stars, with temperatures of about 3000 K, then we go through yellow stars likethe Sun which has a temperature of about 5800 K, and white and blue stars are the hottest stars withtemperatures of 10000 K or greater, they can actually go up to 30000 K or more.Types:The types of stars are then defined by a combination of these properties. You often hear starsreferred to with labels like 'red giant' which is cool but luminous star; or 'white dwarf' which is a hot butlow luminosity star.

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