* Epsilon Herculis (ε Her): A red giant star, about 100 times the size of our sun. It's also known as Kopf, meaning "head" in German, due to its position in the constellation.
* Zeta Herculis (ζ Her): Another red giant star, slightly smaller than Epsilon Herculis. It's about 70 times the size of our sun.
* Beta Herculis (β Her): A white giant star, slightly smaller than Zeta Herculis. It's about 50 times the size of our sun.
While these are the largest in terms of physical size, it's worth noting that Mu Herculis (μ Her) is the most luminous star in the constellation, though it is not the largest.
Remember that the term "largest" can refer to both physical size and luminosity. For the most accurate information, it's important to specify which aspect of the star you are referring to.
