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User:Miacobuc/EZ Aquarii

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EZ Aquarii A/B/C
EZ Aquarii star system
EZ Aquarii Star System.
Credit: SpaceEngine/Bob Trembley
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 38m 33.73s[1]
Declination −15° 17′ 57.3″[1]
Apparent magnitude (V) 12.38[2] (13.03/13.27/15.07)[3]
Characteristics
Spectral type M5 V[3]
B−V color index +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]
Distance11.11 ± 0.03 ly
(3.41 ± 0.01 pc)
Absolute magnitude (MV)14.75[9] (15.33/15.58/17.37)[3]
Orbit[10]
PrimaryEZ Aquarii AC
CompanionEZ Aquarii B
Period (P)2.2506±0.0033 yr
Semi-major axis (a)0.346±0.004″
Eccentricity (e)0.437±0.007
Inclination (i)112.4±0.5°
Longitude of the node (Ω)162.1±0.4°
Periastron epoch (T)1987.236 ± 0.014
Argument of periastron (ω)
(secondary)		−17.7±1.1°
Details
EZ Aquarii A
Mass0.1187±0.0011[8] M☉
Luminosity0.00078[8] L☉
EZ Aquarii C
Mass0.0930±0.0008[8] M☉
Luminosity0.00012[8] L☉
EZ Aquarii B
Mass0.1145±0.0012[8] M☉
Radius0.21±0.04[8] R☉
Temperature2650±200[8] K
Other designations
EZ Aqr, GJ 866[11], G 156-031, L 789-6, LHS 68, GCTP 5475.00[12]
Database references
SIMBADdata
EZ Aquarii is located in the constellation Aquarius.
EZ Aquarii is located in the constellation Aquarius.
EZ
Location of EZ Aquarii in the constellation Aquarius

EZ Aquarii is a triple star system 11.1 light-years (3.4 parsecs) 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 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[13]. The high proper motion of EZ Aquarii may have been discovered by Willem Jacob Luyten with his automated photographic plate scanner[14].

The configuration of the inner binary pair may permit a circumbinary planet to orbit near their habitable zone. EZ Aquarii is approaching the Solar System and, in about 32,300 years, will be at its minimal distance of about 8.2 ly (2.5 pc) from the Sun. The ChView simulation shows that currently its nearest neighbouring star is Lacaille 9352 at about 4.1 ly (1.3 pc) from EZ Aquarii.

System edit

 
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 edit

This star is a red dwarf of type M5V which has a mass of 0.1187±0.0011 solar masses. It has a parallax of 293.6±0.9 mas. Its period in days around EZ Aquarii C is 3.786516±0.000005 d 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 edit

There is less known about this star compared to A. Its type is likely a type MV with a mass of 0.1145±0.0012 solar masses. It orbits the AC system with a period of 822.6±0.2 d at an eccentricity of 0.439±0.001. 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 edit

Like the other two, this star is likely a type MV with a mass of 0.0930±0.0008 solar masses. It orbits A in a period of 3.786516±0.000005 d with a nearly circular orbit. It is the dimmest of the three with an absolute magnitude of 17.37. An alternate destination for it are GL 866C.

See also edit

References edit

  1. ^ a b Cite error: The named reference 2MASS was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference ucac4 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference RECONS was invoked but never defined (see the help page).
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  5. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
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  7. ^ a b Cite error: The named reference apj582_2_1011 was invoked but never defined (see the help page).
  8. ^ a b c d e f g h Cite error: The named reference Torres2009 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference houdebine2003 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference aaa353_253 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gliese1991 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Woitas, Jens; Leinert, Christoph; Jahreiß, Hartmut; Henry, Todd; Franz, Otto; Wasserman, Larry (1999-10-22). "The nearby M-dwarf system Gliese 866 revisited". arXiv:astro-ph/9910411.
  14. ^ "EZ Aquarii 3". www.solstation.com. Retrieved 2023-05-01.

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External links edit

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