``Astronomy A Physical Perspective''
by Marc Kutner
Lecture 1 PDF
Lecture 2 PDF
Lecture 3 PDF
Lecture 4 PDF
Lecture 5 PDF
Lecture 6 PDF
Lecture 7 PDF
Lecture 8 PDF
Lecture 9 PDF
Lecture 10 PDF
Lecture 11 PDF
Lecture 12 PDF
The links below are to some animations that show the evolution of stars from the main sequence, both on an HR diagram and also slices through the star showing the different thermonuclear burning schemes during post main sequence evolution.
Evolution of a solar mass star
Evolution of a solar mass star illustrating nuclear burning zones inside the star