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This very narrow eclipsing binary of two large blue stars lies in the Andromeda Nebula (M31). There is a mass transfer from the B to the A star.
Due to this double in the year 2005 the distance to M31 could be measured accurate to 100 000 light-years.

Constellation: Andromeda
Distance: 2.52 million light-years
Space between M31VJ00443799+4129236 A and B: 0.15 AU
Orbit period of M31VJ00443799+4129236 A and B: 3.54969 days

M31VJ00443799+4129236 A

Spectral class: O
Mass: 23 * Sun
Diameter: 13.1 * Sun

M31VJ00443799+4129236 B

Spectral class: B
Mass: 15 * Sun
Diameter: 11.3 * Sun

Back: List of big and giant stars part 2


The central region of the Andromeda Nebula.
Foto: T.A.Rector and B.A.Wolpa/NOAO/AURA/NSF

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