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A lot of these stars pulsate due to the way their upper layers absorb and emit energy from the core below, and while that’s complex it’s fairly well understood. However, a lot of these stars have a second periodicity on top of the primary one that generally lasts for months to years — much much longer than the primary pulsation period. These are called long secondary periods, and were first seen in red giants back in the 1930s. However, despite a century of observations the cause hasn’t been clear.
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