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What is an eclipsing binary?

Answer 1

When two stars orbit each other and both comes in our line of sight brightness variations take palace due to one eclipsing other.

One star goes in front and back of other making changes in brightness..From distance we see only one star so suspect it to be a variable.But the variations are due to eclipsing effect.

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Answer 2

Lincoln Adams

A binary star system known as an eclipsing binary is one in which the stars' orbital planes are oriented so that, as viewed from Earth, they periodically eclipse each other. As a result, there are regular variations in the system's overall brightness during the eclipses, which can be used to study the stars' masses, sizes, and temperatures.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.