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Surface Mapping of the he & SI Distribution of Four B Stars

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Table 3. Physical parameters of the four studied stars. HD 131120 HD 105382 HD 138769 HD 55522 T e ff (K) 18 250 ± 420 17 400 ± 400 17 500 ± 400 17 400 ± 400 log g 4.10 ± 0.15 4.18 ± 0.15 4.22 ± 0.15 4.15 ± 0.15 log L/L 3.13 ± 0.15 2.89 ± 0.15 2.98 ± 0.15
Fig. 1. For HD 105382, first three observed moments of the Si II 4128 Å line (dots, left) and of the He I 4121 Å line (dots, right)
Fig. 2. For HD 138769 (upper) and HD 55522 (lower), phase diagrams of the HIPPARCOS data and of the U-magnitude data (dots) are compared with their best sinusoidal fits for the indicated frequency (full lines).
Fig. 3. For HD 138769, first three observed moments of the Si II 4128 Å line (dots, left) and of the He I 4121 Å line (dots, right)
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