|Last: 8. The Sun||Next: 10. Stellar Nurseries|
|Ch. 8-1||Distances to nearby stars are determined by stellar parallax|
|Ch. 8-2||Apparent magnitude measures the brightness of stars as seen from Earth|
|Ch. 8-3||Absolute magnitudes do not depend on distance|
|Ch. 8||THE TEMPERATURE OF STARS (p. 170)|
|Ch. 8-4||A star's color reveals its surface temperature|
|Ch. 8-5||A star's spectrum also reveals its surface temperature|
|Ch. 8-6||Stars are classified by their spectra|
|Ch. 8||TYPES OF STARS (p. 173)|
|Ch. 8-7||The Hertzsprung-Russell diagram identifies distinct groups of stars|
|Ch. 8-8||Luminosity classes|
|Ch. 8-9||A star's spectral type and luminosity class provide a second distance-measuring technique|
The Hipparcos satellite measured positions and parallaxes for thousands of stars with enormous accuracy.
A superb essay by Philip Morrison describing early measurements of stellar parallax and contrasting them with Hipparcos. Highly recommended!
Animation of the 150 nearest stars, made using Hipparcos data. Color indicates stellar luminosity: blue stars are above 10 L, yellow stars are between 1 and 10 L, orange stars are between 0.1 and 1 L, and red stars are below 0.1 L.
Homework 9: Finding Distance With Parallax, due 10/30.
Quiz 9: Is The Sun A Star?, given 10/25.
Last modified: October 25, 2001