A helium star has lost most of its hydrogen-rich envelope and is made predominantly of helium. If massive enough, its core can ignite helium; a lower-mass stripped core instead becomes a helium white dwarf.
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Helium stars are a class of stars that primarily emit energy through the fusion of helium in their cores. They typically arise in specific evolutionary stages of stellar evolution, often from the remnants of more massive stars. Here are some key points about helium stars: 1. **Origin**: Helium stars usually form from the remnants of massive stars that have completed helium burning in their cores, such as during the late stages of their evolution.