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A new analysis of the B-type stars in Ori OB1 (Simón-Díaz 2010)<br />

Silicon abundance determination + fine-tuning of stellar parameters (curve of growth)<br />

• For a given pair (Teff, logg), 2 free<br />

parameters: (ξ t , ε(Si))<br />

• Actually, the four parameters are<br />

determined at the same time

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