Fig. 7
a) Measured Vsini parameters in km s-1 by means of the FT technique of the HeI 4471 line broadened by differential rotation characterized by different values of the parameter α in an object of “pnrc” parameters Teff = 23 000 K and log g = 4.1 rotating at different rates η. In abscissas are the true equatorial Vsini for the same rates η. b) Idem for the MgII 4481 line.
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