Pulsating variable star YZ Boo. All of my previous variable star measurements have been of eclipsing binary stars where the change in brightness is due to one star coming in front of the other. YZ Boo is a single star that pulsates radially and so causing a brightness fluctuation. The process behind this is essentially the same as in Cepheid variables. Main sequence stars are in equilibrium. There is an outward force due to the internal pressure which depends on the temperature and an inwar
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