astro.wikisort.org - Star

Search / Calendar

EZ Aquarii is a triple star system approximately 11.3 ly (3.5 pc) from the Sun in the constellation Aquarius. It is also known as Luyten 789-6 and Gliese 866. 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.[10] The A and B components of Luyten 789-6 together emit X-rays.[11]

EZ Aquarii A/B/C

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) 12.87 (13.33/13.27/14.03)[2]
Characteristics
Spectral type M5 V[2]
U−B color index +1.54
B−V color index +1.96[3]
R−I color index +0.64 [citation needed]
Astrometry
Radial velocity (Rv)–59.9[4] km/s
Proper motion (μ) RA: +2314[5] mas/yr
Dec.: +2295[5] mas/yr
Parallax (π)293.6 ± 0.9 mas[6]
Distance11.11 ± 0.03 ly
(3.41 ± 0.01 pc)
Absolute magnitude (MV)15.64/15.58/16.34[2]
Details
Mass0.11/0.11/0.10[2] M☉
Orbit[7]
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°
Other designations
EZ Aqr, GJ 866[8], G 156-031, L 789-6, LHS 68, GCTP 5475.00[9]
Database references
SIMBADdata
EZ
Location of EZ Aquarii in the constellation Aquarius

The configuration of the inner binary pair may permit a circumbinary planet to orbit near their habitable zone.[12] 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.[13] The ChView simulation shows that currently its nearest neighbouring star is Lacaille 9352 at about 4.1 ly (1.3 pc) from EZ Aquarii.


See also



References


  1. Cutri, R. M.; et al. (June 2003). 2MASS All Sky Catalog of point sources. NASA. Bibcode:2003tmc..book.....C.
  2. "The One Hundred Nearest Star Systems". RECONS. Georgia State University. Archived from the original on 2012-05-13. Retrieved 2010-06-30.
  3. Eggen, O. J.; Greenstein, J. L. (October 1965). "Observations of proper-motion stars. II". Astrophysical Journal. 142: 925. Bibcode:1965ApJ...142..925E. doi:10.1086/148362.
  4. Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
  5. Salim, Samir; Gould, Andrew (January 2003). "Improved Astrometry and Photometry for the Luyten Catalog. II. Faint Stars and the Revised Catalog". The Astrophysical Journal. 582 (2): 1011–1031. arXiv:astro-ph/0206318. Bibcode:2003ApJ...582.1011S. doi:10.1086/344822. S2CID 19035401.
  6. Torres, G.; Andersen, J.; Giménez, A. (2010). "Accurate masses and radii of normal stars: modern results and applications". The Astronomy & Astrophysics Review. 18 (1–2): 67–126. arXiv:0908.2624. Bibcode:2010A&ARv..18...67T. doi:10.1007/s00159-009-0025-1. S2CID 14006009. VizieR
  7. Woitas, J.; Leinert, Ch.; Jahreiß, H.; Henry, T.; Franz, O. G.; Wasserman, L. H. (January 2000). "The nearby M-dwarf system Gliese 866 revisited". Astronomy and Astrophysics. 353: 253–256. arXiv:astro-ph/9910411. Bibcode:2000A&A...353..253W.
  8. Gliese, W.; Jahreiß, H. (1991). "Gl 866". Preliminary Version of the Third Catalogue of Nearby Stars. Retrieved 2014-10-20.
  9. "EZ Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-12-14.
  10. Delfosse, Xavier; et al. (October 1999), "Accurate masses of very low mass stars. II. The very low mass triple system GL 866", Astronomy and Astrophysics, 350: L39–L42, arXiv:astro-ph/9909409, Bibcode:1999A&A...350L..39D
  11. Schmitt, J.H.M.M.; Golub, L.; Harnden, F.R. Jr.; Maxson, C.W.; Rosner, R.; Vaiana, G.S. (March 1985). "An Einstein Observatory X-ray survey of main-sequence stars with shallow convection zones". Astrophysical Journal. 290 (Part 1): 307–320. Bibcode:1985ApJ...290..307S. doi:10.1086/162986.
  12. Popova, E. A.; Shevchenko, I. I. (April 2016), "On possible circumbinary configurations of the planetary systems of α Centauri and EZ Aquarii", Astronomy Letters, 42 (4): 260–267, Bibcode:2016AstL...42..260P, doi:10.1134/S106377371604006X, S2CID 123811835.
  13. Bobylev, V. V. (November 2010), "Stars outside the Hipparcos list closely encountering the Solar system", Astronomy Letters, 36 (11): 816–822, arXiv:1009.4856, Bibcode:2010AstL...36..816B, doi:10.1134/S1063773710110071, S2CID 118512652



На других языках

[de] EZ Aquarii

EZ Aquarii auch Luyten 789-6 oder Gliese 866 ist ein Sternensystem, das aus drei roten Zwergen der Spektralklasse M besteht, und daher zu den BY-Draconis-Sternen zählt. Es ist ca. 11,1 Lichtjahre (3,4 pc) von unserem Sonnensystem entfernt und befindet sich im Sternbild Wassermann.
- [en] EZ Aquarii

[es] EZ Aquarii

EZ Aquarii es un sistema triple que dista de la Tierra aproximadamente 3.4 pc o 11.08 A.N. Pertenece a la constelación de Acuario. Sus tres componentes tienen tipo espectral M y son enanas rojas. La componente principal es también una binaria espectroscópica.

[ru] EZ Водолея

EZ Водолея — тройная звезда в созвездии Водолея. Находится на расстоянии 3,4 парсека (11,3 световых года) от Солнца.


Текст в блоке "Читать" взят с сайта "Википедия" и доступен по лицензии Creative Commons Attribution-ShareAlike; в отдельных случаях могут действовать дополнительные условия.

Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.

2019-2025
WikiSort.org - проект по пересортировке и дополнению контента Википедии