Helium star

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What Wikipedia says

A helium star is a class O or B star (blue), which has extraordinarily strong helium lines and weaker than normal hydrogen lines, indicating strong stellar winds and a mass loss of the outer envelope. Extreme helium stars (EHe) entirely lack hydrogen in their spectra.

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