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Stellar Mass, Luminosity and Lifespan

Now we get to some real meat of astrophysics. We discuss the relationship between mass, luminosity, and lifespan of main sequence stars. It is an amazing discovery that mass is known to be tightly correlated to luminosity for Main Sequence stars. Also, the luminosity is tightly related to spectral type. So, just get the spectrum, and you know the mass! This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter. https://en.wikipedia.org/wiki/Hertzsp... Hertzsprung-Russell diagram https://en.wikipedia.org/wiki/Luminos... Luminosity/Radius/Temperature Relation https://en.wikipedia.org/wiki/Stellar... Stellal Evolution http://hyperphysics.phy-astr.gsu.edu/... Stellar Lifetime https://arxiv.org/pdf/1501.06585.pdf Main-Sequence Effective Temperatures from a Revised Mass-Luminosity Relation Based on Accurate Properties https://en.wikipedia.org/wiki/CNO_cycle CNO Cycle https://en.wikipedia.org/wiki/Proton-... Proton-Proton Chain 0:00 Introduction 0:01 Summary of Stellar Properties on the H-R Diagram 1:10 Stellar Radius as a Function of Mass 3:02 Stellar Luminosity as a Function of Mass 3:36 Stellar Masses and the Main Sequence 4:58 Stellar Masses from Close Binary Stars 6:06 Key Properties 9:46 Massive stars are rare! 10:24 Main Sequence Membership 12:02 Mass-Luminosity Relationship 13:15 The Main Sequence is a Mass Sequence 13:56 The Upper Main Sequence 15:23 The Main Sequence near the Sun 16:09 The Lowest Mass Stars 17:09 Brighter with age... 22:05 The Nuclear Timescale 23:31 Main Sequence Lifetime 25:26 Consequences... 28:07 REVIEW QUESTIONS