

HDE 226868 is a type O9.7 Iab intermediate luminous supergiant star. It is between 20 and 40 times the mass of the sun, around 20 times larger, and may be 400,000 times more luminous than the Sun. What is really interesting about this star is that it is a binary with Cygnus X-1, a black hole, as its partner. The radius of Cygnus X-1’s orbit around HDE 226868 is only about twice the radius of HDE 226868 itself. The stellar wind coming from HDE 226868 produces an accretion disk around Cygnus X-1 the inner part of which gets heated to millions of degrees producing highly energetic X-rays. The star actually loses the mass of the sun every 400,000 years.
(Source:Whillyard)
12 notesPosted on Tuesday, 24 July
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