Abstract
Many clues to η Carinae’s structure and physics can be found in its observed behavioral timescales, ranging from a few days to a few centuries. Here these are reviewed in three categories: the 5.5-year spectroscopic cycle with its spectroscopic events, the Great Eruption of 1830–1860, and the subsequent unsteady recovery. Unfortunately, the underlying thread shared by these stories is a scarcity of theoretical effort. Eta Car may or may not be an exception to general rules; but either way, as the most observable very massive star, it reveals major gaps in existing theory. Recent observers have found many unexpected, highly suggestive discoveries in this topic, including phenomena that cannot be observed in any other known object. A variety of specific unsolved theoretical problems are noted here.
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Davidson, K. (2012). The Central Star: Instability and Recovery. In: Davidson, K., Humphreys, R. (eds) Eta Carinae and the Supernova Impostors. Astrophysics and Space Science Library, vol 384. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-2275-4_3
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