Subdwarf B star

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What Wikipedia says

A B-type subdwarf (sdB) is a kind of subdwarf star with spectral type B. They differ from the typical subdwarf by being much hotter and brighter. They are situated at the "extreme horizontal branch" of the Hertzsprung–Russell diagram.

Excerpt from the Wikipedia article “Subdwarf B star”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ESO/L. Calçada, INAF-Padua/S. Zaggia, CC BY 4.0, via Wikimedia Commons.