These three stars can easily be seen with the naked eye, but it took some fancy telescopes for us to realize how weird they really are!

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Sources:

http://www.stsci.edu/instruments/obse...
http://iopscience.iop.org/article/10....
http://articles.adsabs.harvard.edu/cg...
http://abyss.uoregon.edu/~js/ast122/l...

http://www.skyandtelescope.com/astron...
https://www.aavso.org/miravariables...
http://iopscience.iop.org/article/10....
http://articles.adsabs.harvard.edu/cg...
https://www.sciencedirect.com/science...
https://www.space.com/3250starspron...
https://www.universetoday.com/20094/c...
https://science.nasa.gov/sciencenews...

https://www.space.com/7653starbigd...
http://earthsky.org/brighteststars/m...
http://www.skyandtelescope.com/observ...

Images:

https://en.wikipedia.org/wiki/File:Bi...
https://en.wikipedia.org/wiki/File:Di...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:Ve...
https://en.wikipedia.org/wiki/File:Mi...
https://en.wikipedia.org/wiki/File:Mi...
https://en.wikipedia.org/wiki/File:Ce...
https://commons.wikimedia.org/wiki/Fi...
https://svs.gsfc.nasa.gov/11541