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

In summary, the B-V index for binary stars is a measure of the color difference between two stars in a binary system. It is used in studying binary stars to determine their temperature and spectral type. A negative B-V index indicates a bluer color, which can be caused by a hotter or more massive star or a blue companion. The B-V index can change over time due to various factors, and when combined with other measurements, it can help determine the masses of the individual stars in the system.
  • #1
Fernsanz
57
0
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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  • #2
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?
 

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

1. What is the B-V index for binary stars?

The B-V index for binary stars is a measure of the color difference between two stars in a binary system. It is calculated by taking the difference in the apparent magnitudes (brightness) of the stars in the B (blue) and V (visible) filters.

2. How is the B-V index used in studying binary stars?

The B-V index is used to determine the temperature and spectral type of the individual stars in a binary system. By comparing the B-V index to known values for different types of stars, scientists can classify the stars and gain insight into their physical properties.

3. What does a negative B-V index indicate?

A negative B-V index indicates that the star appears bluer in color than a reference star of the same temperature. This can be caused by a hotter, more massive star in the binary system, or by the presence of a blue companion star.

4. How does the B-V index change over time in a binary star system?

The B-V index can change over time in a binary star system due to changes in the stars' distances from Earth, changes in their temperatures, or changes in their relative positions in the binary orbit. These changes can be observed and measured by scientists to track the evolution of the binary system.

5. Can the B-V index be used to determine the mass of a binary star system?

No, the B-V index alone cannot be used to determine the mass of a binary star system. However, when combined with other measurements such as the stars' orbital velocities and luminosities, the B-V index can provide valuable information for calculating the masses of the individual stars in the binary system.

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