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AU Microscopii
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==Stellar properties== AU Mic is a young star at only 22 million years old; less than 1% of the age of the Sun.<ref name=PlavchanNature_2020/> With a [[stellar classification]] of M1 Ve,<ref name=aaa460_3_695/> it is a [[red dwarf star]]<ref name=baas23_1382/> with a physical radius of 75% that of the [[Sun]]. Despite being half the Sun's mass,<ref name="DELZANNA2002"/><ref name=sci303_5666_1982/> it is radiating only 9%<ref name=apj698_2_1068/> as much luminosity as the Sun. This energy is being emitted from the star's [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 3,700 [[Kelvin|K]], giving it the cool orange-red hued glow of an [[M-type star]].<ref name=csiro/> AU Microscopii is a member of the [[Beta Pictoris Moving Group|Ξ² Pictoris moving group]].<ref name=araa41_1_685/><ref name=apj520_2_L123/> AU Microscopii may be [[gravitationally bound]] to the binary star system [[AT Microscopii]].<ref name=aaa302_193/> [[File:AUMicLightCurve.png|thumb|left|A [[light curve]] for AU Microscopii, plotted from ''[[Transiting Exoplanet Survey Satellite|TESS]]'' data<ref name=MAST/>]] AU Microscopii has been observed in every part of the [[electromagnetic spectrum]] from [[radio]] to [[X-ray]] and is known to undergo [[flare star|flaring]] activity at all these wavelengths.<ref name=apj421_2_800/><ref name=apj414_2_L49/><ref name=apj312_822/><ref name = "TSIKOUDI2000"/> Its flaring behaviour was first identified in 1973.<ref name=apjs25_1/><ref name=mnras197_815/> Underlying these random outbreaks is a nearly [[sinusoidal]] variation in its brightness with a period of 4.865 days. The amplitude of this variation changes slowly with time. The [[UBV photometric system|V band]] brightness variation was approximately 0.3 [[Absolute magnitude|magnitude]]s in 1971; by 1980 it was merely 0.1 magnitudes.<ref name=aaa174_1_139/> {{clear left}}
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