AST101H5 Chapter Notes - Chapter 11: Globular Cluster, Milky Way, Spectral Sequence
Document Summary
Basics of the h-r diagram: you can plot any star on an h-r diagram, as long as you know its spectral type and luminosity, the horizontal axis represents the stellar surface temperature. Temperature decreases from left to right because the diagram is based on the spectral sequence obafgkm: the vertical axis represents the stellar luminosity. Stars on the upper right are cool and luminous. Stars near the lower right are cool and dim. Patterns in the h-r diagram: stars cluster into 4 groups, most stars fall somewhere along the main sequence. These stars are usually placed on the h-r graph between the upper left to the lower right: supergiants stars that are placed in the upper right side of the h-r diagram. Complete stellar classification: two different ways to categorize stars, spectral type: designed by the letters obafgkm, tells us the surface temperature and color.
