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40 Persei
Star in the constellation Perseus From Wikipedia, the free encyclopedia
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40 Persei is a wide binary star[13] system in the northern constellation of Perseus. It has the Bayer designation ο Persei, while 40 Persei is the Flamsteed designation. The system is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.97.[2] It is located approximately 1060 light years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22 km/s.[6] The system is a member of the Perseus OB2 association of co-moving stars.[14]
The primary component is a massive B-type main-sequence star with a stellar classification of B0.5V.[3] It is about 7.2[11] million years old and has a very low projected rotational velocity for an early B-type star,[15] measured at 10 km/s.[10] This star has 12.5[7] times the mass of the Sun and is radiating 936[2] times the Sun's luminosity from its photosphere at an effective temperature of 29,330 K.[9] The companion is magnitude 10.04, A-type main-sequence star with a class of A1Vn, and is located at an angular separation of 19.8″ from the primary.[4]
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