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@astrobellatrix The ULX does appear to be a HMXB https://t.co/QZHRegETiJ but there's debate still if it is responsible for the He III in the main region https://t.co/k7DZo5YhF3 - would love to hear your thoughts!
A STATE TRANSITION OF THE LUMINOUS X-RAY BINARY IN THE LOW-METALLICITY BLUE COMPACT DWARF GALAXY I Zw 18
Overview of attention for article published in The Astrophysical Journal, May 2013