What Does "Polluted" Mean in This Context?

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Typically, the strong gravitational pull of a white dwarf should cause heavier elements to sink below its atmosphere, leaving only the lightest elements visible. However, observations have shown that many white dwarfs have atmospheres "polluted" with heavier elements like calcium, magnesium, and iron.<br></div></div> </div> <hr /> <h3 class="rq-heading">Frequently asked queries:</h3> <div class="qa-container"> <div class="qa-item"> <a href="https://theastrophysics.com/knowledgebase/what-are-white-dwarfs" title="What are White Dwarfs?">What are White Dwarfs?</a> </div> <div class="qa-item"> <a href="https://theastrophysics.com/knowledgebase/what-does-polluted-mean-in-this-context" title="What Does "Polluted" Mean in This Context?">What Does "Polluted" Mean in This Context?</a> </div> <div class="qa-item"> <a href="https://theastrophysics.com/knowledgebase/how-are-polluted-white-dwarfs-detected" title="How are Polluted White Dwarfs Detected?">How are Polluted White Dwarfs Detected?</a> </div> <div class="qa-item"> <a href="https://theastrophysics.com/knowledgebase/what-causes-the-pollution" title="What Causes the Pollution?">What Causes the 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What Does "Polluted" Mean in This Context? | Polluted White Dwarfs