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W Ursae Majoris

This is the eponym for binaries which are so close that they touch one another. Thus both stars have a drop-like shape with their peaks pointing at each other.

Constellation: Ursa Major
Distance: 162 light-years
Visual magnitude A and B: 7.75 8.48
Space between W Ursae Majoris A and B: 0 AU
Orbit period of W Ursae Majoris A and B: 8 hours

W Ursae Majoris A

Spectral class: F8Vp
Luminosity: 1.45 * Sun
Mass: 0.99 * Sun
Diameter: 1.14 * Sun
 

W Ursae Majoris B

Spectral class: F8Vp
Luminosity: 1 * Sun
Mass: 0.62 * Sun
Diameter: 0.83 * Sun

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Photo: ESO Online Digitized Sky Survey

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