Fig. 1
Photospheric line profiles in Vega’s spectrum. Strong lines exhibit classical, rotationally broadened line profiles, while weak lines show flat-bottomed trapezoidal profiles indicative of gravity darkening. The three dominant lines in this figure are: Mg I 5183.60 Å, Ti II 5185.90 Å (very slightly blended with a Si II line) and Ti II 5188.68 Å.
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