EZ Aquarii

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Template:Short description Template:Sky

Template:Starbox visbin

EZ Aquarii A/B/C
EZ Aquarii star system
EZ Aquarii Star System (simulation).
Credit: SpaceEngine/Bob Trembley
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 12.38[2] (13.03/13.27/15.07)[3]
Characteristics
Spectral type M5 V[3]
B−V Template:Engvar +1.96[4]
Variable type Flare star + BY Dra[5]
Astrometry
Radial velocity (Rv)−59.9[6] km/s
Proper motion (μ) RA: +2314[7] mas/yr
Dec.: +2295[7] mas/yr
Parallax (π)293.6±0.9 mas[8]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)14.75[9] (15.33/15.58/17.37)[3]
Details
EZ Aquarii A
MassTemplate:Val[8] Template:Solar mass
Radius0.175[10] Template:Solar radius
Luminosity0.00078[8] Template:Solar luminosity
EZ Aquarii C
MassTemplate:Val[8] Template:Solar mass
Luminosity0.00012[8] Template:Solar luminosity
Metallicity [Fe/H]{{{metal_fe2}}} dex
EZ Aquarii B
MassTemplate:Val[8] Template:Solar mass
RadiusTemplate:Val[8] Template:Solar radius
TemperatureTemplate:Val[8] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist, GCTP 5475.00[11]
Database references
SIMBADdata
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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.[8] All three seem to have masses close to the hydrogen burning mass limit.[12]

William E. Kunkel announced that Luyten 789-6 was a flare star in 1972, after having observed seven flares.[13] It was given its variable star designation, EZ Aquarii, in 1978.[14]

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.[15] 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.[16] The ChView simulation shows that currently its nearest neighbouring star is Lacaille 9352 at about Template:Convert from EZ Aquarii. Template:TOC limit

System

File:EZAqrLightCurve.png
An ultraviolet band light curve for EZ Aquarii, adapted from Jevremovic et al. (1998).[17] 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.[18] The A and B components of Luyten 789-6 together emit X-rays.[19]

EZ Aquarii A

This star is a red dwarf of type M5V[3] which has a mass of Template:Val solar masses.[8] It has a parallax of Template:Val.[20] Its period in days around EZ Aquarii C is Template:Val with an eccentricity of 0 which together make up the primary of the system.[20] It has an absolute magnitude at wavelengths centered at 5500 Angstroms of 15.33 making it the brightest of the three.[3] 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[3] with a mass of Template:Val solar masses.[8] It orbits the AC system with a period of Template:Val at an eccentricity of Template:Val.[20] It has an absolute magnitude of 15.58, making it dimmer than A but brighter than C.[3] 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[3] with a mass of Template:Val solar masses.[8] It orbits A in a period of Template:Val with a nearly circular orbit.[20] It is the dimmest of the three with an absolute magnitude of 17.37.[3] 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.[21]

See also

References

Template:Reflist

External links

Template:Nearest systems Template:Stars of Aquarius

  1. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named 2MASS
  2. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named ucac4
  3. ↑ a b c d e f g h i Cite error: Invalid <ref> tag; no text was provided for refs named RECONS
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj142_925
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gcvs
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gcsrv
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apj582_2_1011
  8. ↑ a b c d e f g h i j k l Cite error: Invalid <ref> tag; no text was provided for refs named Torres2009
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named houdebine2003
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa353_253
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kunkel
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kholopov
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Popova2016
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named al36_11_816
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Jevremovic
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa350_L39
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj290_307
  20. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Ségransan2000
  21. ↑ Script error: No such module "citation/CS1".
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