The bright stars at the center of an emission nebula (H II region)are:

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The bright stars at the center of an emission nebula are typically young, massive stars of spectral type O and B, which emit large amounts of ultraviolet radiation that ionizes the surrounding gas and causes it to glow. These stars are short-lived and are thought to be responsible for much of the chemical enrichment in the galaxy. Red supergiants are older and less luminous stars, while hot white dwarfs are the remnants of stars that have already gone through their main sequence evolution. T Tauri stars are young stars that have not yet reached the main sequence and are not typically found in H II regions.

The Bright Stars at the Center of an Emission Nebula