description Cygnus X-1 Overview
Cygnus X-1 is an X-ray binary system in the constellation Cygnus consisting of a compact object and the blue supergiant star HDE 226868. The compact object draws matter from the companion's stellar wind, producing intense X-rays in an accretion flow, and is classified as a stellar-mass black hole. Observations of the system's orbit and radiation made it one of the first widely accepted black-hole candidates, although the black hole itself is not directly visible.
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What is Cygnus X-1 made of?
Cygnus X-1 is an X-ray binary containing a stellar-mass black hole and the blue supergiant star HDE 226868. The compact object orbits its companion in the constellation Cygnus. [Source](https://en.wikipedia.org/wiki/Cygnus_X-1)
Why does Cygnus X-1 emit strong X-rays?
The black hole pulls gas from HDE 226868, including material carried in the star's stellar wind. That gas forms a hot accretion flow whose extreme temperatures produce intense X-rays. [Source](https://en.wikipedia.org/wiki/Cygnus_X-1)
Was Cygnus X-1 the first black hole discovered?
Cygnus X-1 was identified as a powerful black-hole candidate after an X-ray source was detected in 1964. It became one of the first widely accepted stellar-mass black holes, although the black hole itself is not visible like its companion star. [Source](https://en.wikipedia.org/wiki/Cygnus_X-1)
How long does Cygnus X-1 take to orbit its companion?
The black hole and HDE 226868 complete an orbit in about 5.6 days. Their close orbit allows the black hole to capture material from the supergiant's outer atmosphere and wind. [Source](https://en.wikipedia.org/wiki/Cygnus_X-1)
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