Stellar Mass, Luminosity and Lifespan

Описание: 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