This question was recently edited to include a tag called tbinary-star, while the original binary-star was removed. Another question had its binary-star replaced by a tag called ebinary-star. What exactly are the purpose of these tags, and do we really need them?
I suspect tbinary was a typo for ebinary, and I think they are referring to eclipsing binaries. I think both tags should be replaced with eclipsing-star-systems.