General Astronomy - The Lives of Stars

This lecture explains stellar lifecycles from protostars through main-sequence and red giant stages, emphasizing hydrostatic equilibrium, hydrogen and helium fusion, and mass-dependent evolution. It also shows how main-sequence turnoff points reveal star-cluster ages and how stellar fusion creates heavier elements.

Syllabus

Introduction
Main Sequence Stars
Main Sequence Lifetime
Red Dwarfs
Shell Hydrogen Fusion
Red Giant Stars
Mass Loss
Helium Fusion
Degeneracy
Helium Flash
PostMain Sequence Evolution
ZeroAge Main Sequence
HR Main Sequence
Lives from here
Summary
Protostars
Massive Stars
OType Stars
Main Sequence
Core Hydrogen Fusion
The Main Sequence
Open Clusters
G Cluster
Globular Cluster
Age of a Cluster