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Very interesting.
But do we need to correlate the spectra features of the evolution of heavy elements (via nuclear transmutation - as Carl suggested), the rotation period as suggested by the presumption of dark spots transiting the stellar disc and the widening of spectral lines due to the Doppler shift to gain more credence of this method?
I think its good news/progress but I'm not convinced at this point that its a break through - but hope that it is.
Mark C.
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