[Aavso-photometry] RR Lyr surface velocity?

[Canopus56]

I was typing up some notes on the archetype
short-period (13 hours) variable RR Lyr.  Assuming
that the variable does expand and contract across the
period, is there a stellar model estimate or an
empirical estimate of how much the diameter of the
star changes across its cycle and the velocity at
which the star's surface moves? - Kurt 



       
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