Lab 8 – The Distance to the Pleiades Open or Galactic Cluster M13 - Globular Cluster Distance-23,000 ly Size-150 ly Stars in a Cluster Common Properties Distance Age Chemical composition Different Properties Spectral Types (temperature) Luminosity Class (size) Mass D >10 pc 10 pc D <10 pc 10 pc Star Cluster D >10 pc D <10 pc O B A F G K M Absolute Magnitude Main-sequence HR Diagram O B A F G K M Apparent Magnitude Color-Magnitude Diagram Distance Modulus = m - M
The difference between the absolute magnitude and the apparent magnitude can be used to find the distance to a star cluster.
If m-M > 0 then the distance to the cluster is > 10 pc. If m-