Abstract
THERE are good reasons for believing that when a molten sun has sufficiently cooled down to allow of the formation of a solid surface, the solid surface rapidly cools. We may, therefore, regard a cooling sun as passing through three stages: (1) a stage in which the light emitted is very intense and regular; (2) a stage in which the surface from time to time solidifies and breaks up again; in this condition the emission of light would be very variable; (3) a stage in which the crust had become so firm as to be practically permanent, little, if any, light being emitted.
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DEELEY, R. Variable Stars. Nature 98, 109 (1916). https://doi.org/10.1038/098109b0
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DOI: https://doi.org/10.1038/098109b0
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