PG 1159 Stars
PG 1159 stars are a group of very hot, often pulsating WDs for which the prototype is PG 1159 dominated by carbon and oxygen in their atmospheres.
PG 1159 stars reach luminosities of ~1038 erg/s but form a rather distinct class. RX J0122.9-7521 has been identified as a galactic PG 1159 star.
Read more about this topic: Super Soft X-ray Source
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