2.10 Astro 1

# 2.10 Astro 1 - Astro 1 Section 1 Professor Brandt Wednesday...

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Astro 1 Section 1 Professor Brandt Wednesday February 10th 1999 Announcements: Lecture notes: Class 14. We talked about how L T are two of the most important properties used to describe stars. Talked about the H-R diagram L versus T. Saw that most stars lie along the main sequence. Here they burn H -> He in core. While a star is burning H -> He it sits in a stationary place on the main sequence. Reading the diagram this means that the star sits there with constant L and T. Main sequence is not some track along which stars move. Stars are essentially stationary while on it. Track is due to many different masses of stars lying at different places along the main sequence. The way we talk about the masses of a star is by comparing it to the mass of the sun = M (.) Somewhat suprisingly high mass stars live for less time than low mass stars. Even though they have more fuel they burn it faster. This diagram is very fundamental and we will use it throughout the rest of this class. On tests you will need to know how to reason out problems using the HR diagram.

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