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Their spectra are peculiar by having weak hydrogen while on the other hand carbon and helium lines are extra strong , a type of Extreme helium star .
 Extreme helium star
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Extreme helium star