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Definizione
Wikipedia
Mu Aurigae, Latinized as μ Aurigae, is the Bayer designation for an unconfirmed binary star in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of +4.88. Based upon an annual parallax shift of 20.7218±0.4971 mas as seen from Earth, is located 157 light-years from the Sun.
This is an A-type main-sequence star with a stellar classification of A4 Vm; the 'm' suffix indicating that abnormal abundances of heavier elements appear in the star's spectrum, making this an Am star. It is 560 million years old with a projected rotational velocity of 80 km/s. It has double the mass of the Sun and is radiating 23 times the Sun's luminosity at an effective temperature of 7,500 K.
A very close companion has been reported using speckle interferometry, but this remains unconfirmed. The separation at discovery in 1986 was 0.07 mas and it was measured at 0.066 mas in 1999. It was catalogued by Hipparcos as a problem binary, indicating that the measurements of its position were not consistent with the motion of a single star, but no satisfactory orbit could be found to match the motion
