Stellar surface convection introduces an overall blueshift in the light emitted from the photosphere.
a) estimate the doppler shift to the hα line as a result of granular upflows with speeds of 500 m/s.
b) estimate the doppler shift to the hα line as a result of granular downflows with speeds of 1000 m/s.
c) provide an explanation for why the overall effect is a convective blueshift even though the granular downflow speeds are of greater magnitude.
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Stellar surface convection introduces an overall blueshift in the light emitted from the photosphere...
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