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X Persei

A 29 500 kelvin hot blue star, orbited by a neutron star (B). The latter has a relatively weak magnetic field and sends an X-ray flash every 835 seconds.

Constellation: Perseus
Age: < 10 million years
Distance: circa 2700 light-years
Space between X Persei A and B: 2 AU
Orbit period of X Persei A and B: 250 days

X Persei A

Spectral class: O9.5
Visual magnitude: 6.1 - 7.0
Luminosity: 24 000 * Sun
Mass: 15 * Sun
Diameter: 6 * Sun

Back: List of big and giant stars part 2 		    X Persei
The companion in the image, a red giant, probably doesn't belong to the system.
Photo ESO Online Digitized Sky Survey
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