Английская Википедия:EZ Aquarii

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EZ Aquarii is a triple star system Шаблон: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. All three seem to have masses close to the hydrogen burning mass limit.

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. EZ Aquarii is approaching the Solar System and, in about 32,300 years, will be at its minimal distance of about Шаблон:Convert from the Sun. The ChView simulation shows that currently its nearest neighbouring star is Lacaille 9352 at about Шаблон:Convert from EZ Aquarii. Шаблон:TOC limit

System

Файл:EZAqrLightCurve.png

An ultraviolet band light curve for EZ Aquarii, adapted from Jevremovic et al. (1998). The arrows point to the beginning of flares.

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. The A and B components of Luyten 789-6 together emit X-rays.

EZ Aquarii A

This star is a red dwarf of type M5V which has a mass of Шаблон:Val solar masses. It has a parallax of Шаблон:Val. Its period in days around EZ Aquarii C is Шаблон:Val with an eccentricity of 0 which together make up the primary of the system. It has an absolute magnitude at wavelengths centered at 5500 Angstroms of 15.33 making it the brightest of the three. Some alternate designations for it are EZ Aqr, GL 866A, L 789-6 A and LHS 68.

EZ Aquarii B

There is less known about this star compared to A. Its type is likely a type MV with a mass of Шаблон:Val solar masses. It orbits the AC system with a period of Шаблон:Val at an eccentricity of Шаблон:Val. It has an absolute magnitude of 15.58, making it dimmer than A but brighter than C. Some alternate designations for it are GL 866B and L 789-6 B.

EZ Aquarii C

Like the other two, this star is likely a type MV with a mass of Шаблон:Val solar masses. It orbits A in a period of Шаблон:Val with a nearly circular orbit. It is the dimmest of the three with an absolute magnitude of 17.37. An alternate designation for it is GL 866C.

Other details

The high proper motion of EZ Aquarii may have been discovered by Willem Jacob Luyten with his automated photographic plate scanner.

See also

• List of nearest stars and brown dwarfs

External links

• Image EZ Aquarii
• Solstation provides an orbital animation as well as a visualization of the habitable zone around EZ Aquarii B.