29:50 Modern Astronomy
Fall 1999
Lecture 5 ...September 1, 1999
The Energy Source of the Sun

In the sky: (a) Mars is getting closer to Scorpius. (b) The summer triangle
First homework set on the web
For your reading enjoyment: Look at lecture notes and textbook material on the solar corona and the solar wind.
I want to emphasize stellar spectroscopy as an important diagnostic of stellar properties.
The spectrum of the star HR 483. What can anyone say about this star?

Where does the Sun get it energy from?

• The powerplant Sun
• An incorrect but illustrative answer
• Nuclear Reactions in the Center of the Sun
• So What?
• About this document ...