AST 104 Lecture Notes - Lecture 9: Red Giant
Document Summary
Lecture 9: h-r diagrams, star clusters, and distance. Help me fill out this table for a a5 v star (m = 2). Really more of a range of possible values, so one individual star will still not give a very accurate distance measurement. Our average distance measurement would be much more accurate. Star cluster - a very large group of stars (gravitationally bound) stars are often found in clusters. Generally contain a few hundred up to a couple thousand members. Can contain more than 1 million stars. Always look like crowded spheres of stars, especially crowded in the center. The stars in any given star cluster are all at (almost exactly) the same distance. The stars in any given star cluster all formed at the same time from the same cloud of stuff. There are distinctive similarities among open clusters and among globular clusters. There are distinctive differences between the two kinds of cluster.
