71478
" X-ray bursters " are one class of X-ray binary stars exhibiting periodic and rapid increases in luminosity ( typically a factor of 10 or greater ) that peak in the X-ray regime of the electromagnetic spectrum .
 astronomical object: X-ray binary stars
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: X-ray binary stars 
Answer:
 astronomical object: X-ray binary stars