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AE Aquarii

This is a double of an orange star and a white dwarf. The white dwarfs rotates every 33 seconds and, like a pulsar, emits X-rays at its magnetic poles. These are caused by incoming gas from the partner star. It is the first white dwarf, where such a behaviour was discovered.

Constellation: Aquarius
Distance: 332 light-years
Orbit period of AE Aquarii A and B: 0.412 days
Spectral class: K5
Visual magnitude: 11.5

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    AE Aquarii
Graphic: Casey Reed / NASA

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