Lab 8 – The Distance to the Pleiades. Open or Galactic Cluster.

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Presentation transcript:

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 Main-sequence HR Diagram O B A F G K M 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-M = 0 then the distance to the cluster is = 10 pc. If m-M < 0 then the distance to the cluster is < 10 pc. DM { Distance Modulus

n Interstellar Dust –Reddens Light (makes stars appear cooler) –Dims Light (makes stars appear further away)

Pleiades - Open Cluster

The End.

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