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Beta Gruis (β Gruis, abbreviated Beta Gru, β Gru), formally named Tiaki /tiˈɑːki/,[12] is the second brightest star in the southern constellation of Grus. It was once considered the rear star in the tail of the constellation of the (Southern) Fish, Piscis Austrinus: it, with Alpha, Delta, Theta, Iota, and Lambda Gruis, belonged to Piscis Austrinus in medieval Arabic astronomy.[13]

"Tiaki" redirects here. For the Japanese proper name, see Chiaki.
Beta Gruis
Location of β Gruis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Grus
Right ascension 22h 42m 40.05027s[1]
Declination −46° 53′ 04.4752″[1]
Apparent magnitude (V) 2.146[2] (2.0 - 2.3[3])
Characteristics
Evolutionary stage AGB[4]
Spectral type M5 III[5]
U−B color index +1.757[2]
B−V color index +1.620[2]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)+1.6[6] km/s
Proper motion (μ) RA: +135.16[1] mas/yr
Dec.: −4.38[1] mas/yr
Parallax (π)18.43 ± 0.42 mas[1]
Distance177 ± 4 ly
(54 ± 1 pc)
Absolute magnitude (MV)−1.61±0.052[7]
Details
Mass2.4[8] M☉
Radius180[9] R☉
Luminosity2,500[9] L☉
Surface gravity (log g)0.4[9] cgs
Temperature3,480[10] K
Metallicity [Fe/H]0.0[9] dex
Other designations
Tiaki, Beta Gru, CD−47 14308, FK5 856, HR 8636, HD 214952, HIP 112122, SAO 231258.[11]
Database references
SIMBADdata

Nomenclature


β Gruis (Latinised to Beta Gruis) is the star's Bayer designation.

It bore the traditional Tuamotuan name of Tiaki.[14] In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Tiaki for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[12]

In Chinese, 鶴 (Hè), meaning Crane, refers to an asterism consisting of Beta Gruis, Alpha Gruis, Epsilon Gruis, Eta Gruis, Delta Tucanae, Zeta Gruis, Iota Gruis, Theta Gruis, Delta² Gruis and Mu¹ Gruis.[16] Consequently, Beta Gruis itself is known as 鶴二 (Hè èr, English: Second Star of the Crane).[17] The Chinese name gave rise to another English name, Ke.[18]


Properties


This is a red giant star[3] on the asymptotic giant branch[4] with an estimated mass of about 2.4 times that of the Sun and a surface temperature of approximately 3,480 K,[10] just over half the surface temperature of the Sun. This low temperature accounts for the dull red color of an M-type star. The total luminosity is about 2,500 times that of the Sun, and it has estimated 180 times the Sun's radius.[8]

Beta Gruis is a semiregular variable (SRb) star that varies in magnitude by about 0.4. It varies between intervals when it displays regular changes with a 37-day periodicity and times when it undergoes slow irregular variability.[3]


References


  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
  2. Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publ. Dept. Astron. Univ. Chile, Publicaciones Universidad de Chile, Department de Astronomy, 1: 1–17, Bibcode:1966PDAUC...1....1G
  3. Otero, S. A.; Moon, T. (December 2006), "The Characteristic Period of Pulsation of β Gruis", The Journal of the American Association of Variable Star Observers, 34 (2): 156–164, Bibcode:2006JAVSO..34..156O
  4. Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". Astronomical Journal. 104 (1): 275–313. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  5. Houk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Ann Arbor: Dept. Of Astronomy, Ann Arbor: Dept. of Astronomy, University of Michigan, 2, Bibcode:1978mcts.book.....H
  6. Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, Astronomisches Rechen-Institut Heidelberg, 35 (35): 1, Bibcode:1999VeARI..35....1W
  7. Park, Sunkyung; et al. (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal, 146 (4): 73, arXiv:1307.0592, Bibcode:2013AJ....146...73P, doi:10.1088/0004-6256/146/4/73, S2CID 119187733.
  8. Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics, 352: 217–227, Bibcode:1999A&A...352..217G
  9. Judge, P. G. (November 1986), "Constraints on the Outer Atmospheric Structure of Late Type Giant Stars with IUE Application to Alpha-Tauri K5III and Beta-Gruis M5III", Monthly Notices of the Royal Astronomical Society, 223 (2): 239, Bibcode:1986MNRAS.223..239J, doi:10.1093/mnras/223.2.239
  10. Engelke, Charles W.; Price, Stephan D.; Kraemer, Kathleen E. (October 2006), "Spectral Irradiance Calibration in the Infrared. XVI. Improved Accuracy in the Infrared Spectra of the Secondary and Tertiary Standard Calibration Stars", The Astronomical Journal, 132 (4): 1445–1463, Bibcode:2006AJ....132.1445E, doi:10.1086/505865
  11. "V* bet Gru -- Variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2010-01-05
  12. "Naming Stars". IAU.org. Retrieved 16 December 2017.
  13. Allen, R. H. (1963), Star Names: Their Lore and Meaning (rep ed.), New York, NY: Dover Publications Inc., p. 238, ISBN 0-486-21079-0
  14. "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 7. Retrieved 2018-07-14.
  15. "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  16. (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  17. (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2008-10-25 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  18. Richard Hinckley Allen: Star Names — Their Lore and Meaning: Grus



На других языках

[de] Beta Gruis

Beta Gruis (β Gruis) ist ein Stern in der Konstellation Kranich. Er hat eine scheinbare Helligkeit von 2,1 mag und gehört der Spektralklasse M5 III an, womit er zu den 100 hellsten Sternen am Nachthimmel gehört.
- [en] Beta Gruis

[es] Beta Gruis

Beta Gruis (β Gru / HD 214952 / HR 8636)[1] es la segunda estrella más brillante de la constelación de Grus con magnitud aparente +2,07, solamente superada por Al Nair (α Gruis). Aun siendo la 60.ª estrella más brillante del cielo[2] —el orden exacto puede variar ligeramente de una a otra clasificación— no posee nombre propio habitual, aunque a veces es conocida como Gruid o Alphaulka.

[ru] Бета Журавля

Бета Журавля (β Gru / β Gruis) — звезда в созвездии Журавля. Звезда также имеет имя Груид, иногда используется имя Альфаулка (الفولقة), перевод с Арабского الفولقة الذنب الحوت الجنوبي Аль-Фавлках Аль-Данаб Аль-Хут Аль-Янибийй, это означает «Граница хвоста Южного Кита», поскольку Альнаир и Бета Журавля проходят вблизи южного горизонта при наблюдении из средних широт Северного полушария, прямо над ними расположено созвездие Южная Рыба. Расстояние до звезды - около 170 световых лет.


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