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Lab 8 – The Distance to the Pleiades

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.

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Lab 8 – The Distance to the Pleiades

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  1. Lab 8 – The Distance to the Pleiades

  2. Open or Galactic Cluster

  3. M13 - Globular Cluster Distance-23,000 ly Size-150 ly

  4. Stars in a Cluster • Common Properties • Distance • Age • Chemical composition • Different Properties • Spectral Types (temperature) • Luminosity Class (size) • Mass

  5. HR Diagram Absolute Magnitude Main-sequence O B A F G K M D >10 pc { DM D <10 pc Apparent Magnitude O B A F G K M Distance Modulus Star Cluster 10 pc Color-Magnitude Diagram D <10 pc 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. 10 pc D >10 pc

  6. Distance Modulus

  7. Interstellar Dust • Reddens Light (makes stars appear cooler) • Dims Light (makes stars appear further away)

  8. Pleiades - Open Cluster

  9. The End.

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