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Theta Normae
Star in the constellation Norma From Wikipedia, the free encyclopedia
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θ Normae, Latinised as Theta Normae, is a binary star system in the constellation Norma. It has an apparent visual magnitude of 5.13[2] and is visible to the naked eye as a faint, blue-white-hued point of light. Based upon an annual parallax shift of 9.27 mas as seen from Earth,[5] this system is located about 352 light-years from the Sun. At that distance, the visual magnitude of these stars is diminished by an extinction of 0.45 due to interstellar dust.[12]
Chini et al. (2012) identified this as a single-lined spectroscopic binary system.[13] The visible component is a B-type main-sequence star with a stellar classification of B8 V.[3] It is about 17[7] million tears old, with 3.6 times the mass of the Sun[7] and 3.05 times the Sun's radius.[8] It is radiating about 184 times the Sun's luminosity from its photosphere at an effective temperature of 12,341 K.[9] It is a mercury-manganese star, a B to A-type star with overabundances of the chemical elements mercury and manganese. It takes 1.144 days to fully rotate and has a projected rotational velocity of 109 km/s, unusually fast of a HgMn star.[10]
This system displays an infrared excess, suggesting a debris disk is orbiting at a mean radius of 21.8 AU with a temperature of 220 K.[8]
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