On the Periodicity of Hubble-Sandage Objects in M 31
The spectral and photometric characteristics of the Hubble-Sandage objects (HSO) are similar to those of the η Car and S Dor variables. They are actually referred to as S Dor-type in the General Catalogue of Variable Stars. Their light variations differ from star to star.
KeywordsVariable Star Light Variation General Catalogue Schmidt Telescope Intrinsic Colour
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