ASTR 220 - Collisions in Space

Homework 3 (12 points)
Due Tuesday April 11 at the beginning of class

  1. Use Wien's law [(peak wavelength) x (Temperature) = 3 x 106 nanometers x Kelvins] and the Stefan-Boltzmann Law [(Luminosity) ~ (Radius)2 x (Temperature)4] to answer the following questions:

  2. Below are the Hertzsprung Russell diagrams of two different star clusters, 47 Tuc and the Pleiades.
    Which one is older?

    Besides their age, in what other ways are these clusters visibly different?
    Picture of 47 Tuc
    Picture of the Pleiades