How Do Eclipses Affect the B-V Index of Identical Binary Stars?

AI Thread Summary
In a binary star system with identical components, the B-V index can be calculated by averaging the indices of the two stars, resulting in the same B-V value as each component. During an eclipse, the observed B-V index of the system will change due to the temporary reduction in light from one star, leading to a shift in the overall color measurement. The total color of the system will appear different during occultation, as the light from the eclipsed star is blocked. This change in the B-V index during eclipses reflects the dynamics of light contribution from each star. Understanding these variations is crucial for studying binary star systems and their characteristics.
Fernsanz
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Hello.

Given a binary system with two identical components (in particular de B-V index of both is the same), how would you calculate the B-V index of the system? and, how would it change during eclipses?

I have my own answer, but want to contrast it against yours.
 
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B-V is just (a measure of) the color of the system.
If both have the same color, what will the total color be?
If both have the same color, would it change during occultation?
 

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