ASTRO-110 Lecture Notes - Lecture 11: Henrietta Swan Leavitt, Compact Car, Main Sequence
18 Sep 2020
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Document Summary
We use binary stars to measure directly the masses of star of every type. As one more to the ipper left of the main sequence. Star become more massive, luminous, and fewer in number. O & b stars burn fuel like a bus. M stars burn fuel like a compact car. Out sun will last 1010 years on the main secquence. B star (10 m) lasts 3. 2 x 107 years. F star (2 m) lasts 1. 8 x109 years. M star (. 5 m) lasts 5. 6 x1010 years. The universe is 1. 4 x 1010 years old. There is a region on the h-r diagram where all stars within it are variable. Henrietta leavitt studied the behavior of cepheid variable stars in the magellenic. Brightness of stars varied in a regular pattern. F-g bright giants whose pulsation periods (1-100 days) get longer with increasing luminosity. Using star clusters for studying stellar evolution. Measuring the age of a star cluster.
