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Allen Downey
2020-11-13 16:42:39 -05:00
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<p>This is the fifth in a series of notebooks related to astronomy data.</p>
<p>As a continuing example, we will replicate part of the analysis in a recent paper, “<a class="reference external" href="https://arxiv.org/abs/1805.00425">Off the beaten path: Gaia reveals GD-1 stars outside of the main stream</a>” by Adrian M. Price-Whelan and Ana Bonaca.</p>
<p>Picking up where we left off, the next step in the analysis is to select candidate stars based on photometry. The following figure from the paper is a color-magnitude diagram for the stars selected based on proper motion:</p>
<img width="300" src="https://github.com/datacarpentry/astronomy-python/raw/gh-pages/fig/gd1-3.png">
<a class="reference internal image-reference" href="https://github.com/datacarpentry/astronomy-python/raw/gh-pages/fig/gd1-3.png"><img alt="https://github.com/datacarpentry/astronomy-python/raw/gh-pages/fig/gd1-3.png" src="https://github.com/datacarpentry/astronomy-python/raw/gh-pages/fig/gd1-3.png" style="width: 300px;" /></a>
<p>In red is a theoretical isochrone, showing where we expect the stars in GD-1 to fall based on the metallicity and age of their original globular cluster.</p>
<p>By selecting stars in the shaded area, we can further distinguish the main sequence of GD-1 from younger background stars.</p>
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