EZ Aquarii
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EZ Aquarii is a triple star system Template:Convert from the Sun in the constellation Aquarius within the Milky Way. It is also known as Luyten 789-6, Gliese 866 and LHS 68. It is a variable star showing flares as well as smaller brightness changes due to rotation. The aggregate mass of the system is 0.3262±0.0018 solar masses.[1] All three seem to have masses close to the hydrogen burning mass limit.[2]
William E. Kunkel announced that Luyten 789-6 was a flare star in 1972, after having observed seven flares.[3] It was given its variable star designation, EZ Aquarii, in 1978.[4] Template:TOC limit
System
All three components are M-type red dwarfs. The pair EZ Aquarii AC form a spectroscopic binary with a 3.8-day orbit and a 0.03 AU separation. This pair share an orbit with EZ Aquarii B that has an 823-day period.[6] The A and B components of Luyten 789-6 together emit X-rays.[7]
The configuration of the inner binary pair may permit a circumbinary planet to orbit near their habitable zone, however no exoplanets have yet been observed.[8] EZ Aquarii is approaching the Solar System and, in about 32,300 years, will be at its minimal distance of about Template:Convert from the Sun.[9] The ChView simulation shows that currently its nearest neighbouring star is Lacaille 9352 at about Template:Convert from EZ Aquarii.
EZ Aquarii A
The brighter resolved star is a spectroscopic binary consisting of two red dwarfs. They orbit every Template:Val days with an eccentricity of 0 (ie. circular).[8]
The primary, component Aa or just A, is of type M5V[10] and has a mass of Template:Val solar masses.[1] It has an absolute magnitude at wavelengths centered at 5500 Angstroms of 15.33 making it the brightest of the three.[10] Some alternate designations for it are EZ Aqr, GL 866A, L 789-6 A and LHS 68.
The secondary, component Ab, is likely a type MV[10] red dwarf with a mass of Template:Val solar masses.[1] It is the dimmest of the three star with an absolute magnitude of 17.37.[10] An alternate designation for it is GL 866C.
EZ Aquarii B
There is less known about this star compared to A. Its type is likely MV[10] with a mass of Template:Val solar masses.[1] It orbits the spectroscopic pair with a period of Template:Val at an eccentricity of Template:Val.[11] It has an absolute magnitude of 15.58.[10] Some alternate designations for it are GL 866B and L 789-6 B.
Other details
The high proper motion of EZ Aquarii may have been discovered by Willem Jacob Luyten with his automated photographic plate scanner.[12]
See also
Notes
References
External links
- Image EZ Aquarii
- Solstation provides an orbital animation as well as a visualization of the habitable zone around EZ Aquarii B.
Template:Nearest systems Template:Stars of Aquarius
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