The bright massive object η Orionis is at the same time a totally eclipsing system, a spectroscopic triple system, a speckle triple system and a visual binary. These circumstances offer an exceptional opportunity for determining the physical parameters of massive stars. Our observations show that the published elements are wrong. We present a new determination of several parameters of the multiple system and propose new visual observations.
Massive Star Triple System Photometric Observation Distance Modulus Speckle Interferometry
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