An Even More Precise View of Aluminum-26 in the Solar Nebula - PowerPoint PPT Presentation

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An Even More Precise View of Aluminum-26 in the Solar Nebula

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  1. An Even More Precise View of Aluminum-26 in the Solar Nebula • 26Al might have come from: • Active stars before the Solar System formed, or • Radiation of dust near the young, active Sun • Distinguishing between these choices requires precise measurements of Al and Mg isotopes to test whether 26Al was distributed uniformly in the Solar System • Uniform 26Al distribution is also essential for its use as a chronometer Wolf-Rayet star spewing stellar winds

  2. An Even More Precise View of Aluminum-26 in the Solar Nebula High-precision isotope data for 15 chondrules (example on left) shows that they all lie on a common growth line that assumes a uniform 26Al/27Al ratio of 5.2 x 10-5, the value in calcium-aluminum-inclusions in primitive chondrites.

  3. An Even More Precise View of Aluminum-26 in the Solar Nebula