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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<br />
• Detailed analysis by multiplets<br />
Identification of problematic lines<br />
(blends, atomic model ...)