Xi Aquarii

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Template:Short description

ξ Aquarii
Template:Location mark
Location of ξ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.690[2]
Characteristics
Spectral type A7 V[3]
U−B Template:Engvar +0.187[4]
B−V Template:Engvar +0.181[4]
Astrometry
Radial velocity (Rv)−26.2[5] km/s
Proper motion (μ) RA: +114.890 mas/yr[1]
Dec.: −24.434 mas/yr[1]
Parallax (π)18.2324±0.1374 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)1.9[6]
Orbit[7]
Period (P)Template:Cvt
Eccentricity (e)0.54
Semi-amplitude (K1)
(primary)		11.0 km/s
Details
ξ Aqr A
Mass1.7Template:Su[2] Template:Solar mass
Luminosity36.0±1.1[8] Template:Solar luminosity
Surface gravity (log g)4.0±0.14[2] cgs
Temperature8,140±277[2] K
Metallicity [Fe/H]–0.03[9] dex
Rotational velocity (v sin i)170[8] km/s
Age567Template:Su[2] Myr
ξ Aqr B
Mass0.9±0.6[6] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Xi Aquarii is a binary star system in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from ξ Aquarii, and abbreviated Xi Aqr or ξ Aqr. The system is visible to the naked eye as a point of light with an apparent visual magnitude of 4.7.[4] The two components are designated Xi Aquarii A (also named Bunda[11]) and B. Based upon parallax measurements, this system lies at a distance of approximately Template:Convert from the Sun.[1] It is drifting closer with a heliocentric radial velocity of –26 km/s.[5] The position of this system near the ecliptic means it is subject to lunar occultation.[12]

Xi Aquarii is a single-lined spectroscopic binary system, which means that the presence of an unseen orbiting companion can be inferred from Doppler shifts in the spectral absorption lines. The two bodies orbit each other with a period of 8,016 days (22 y) and an eccentricity of 0.54.[7] The primary component, Xi Aquarii A, is an A-type main sequence star with a stellar classification of A7 V.[3] It has about 1.7[2] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 170 km/s.[8] The star is radiating 36[8] times the luminosity of the Sun from its photosphere at an effective temperature of 8,140 K.[2]

The orbital data is consistent with the secondary component, Xi Aquarii B, being either a red dwarf or a white dwarf star.[6]

Nomenclature

ξ Aquarii (Latinised to Xi Aquarii) is the binary's Bayer designation. The designations of the two components as Xi Aquarii A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[13]

Along with Beta Aquarii (Sadalsuud) it constituted the Persian lunar mansion Bunda.[14] In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[16] It approved the name Bunda for the component Xi Aquarii A on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[11]

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Thanih Saad al Saaoud (Script error: No such module "Lang". – Template:Transliteration), which was translated into Latin as Script error: No such module "Lang"., meaning "the second of luck of lucks".[17] This star, along with Beta Aquarii and 46 Capricorni, were Template:Transliteration (Script error: No such module "Lang".), "the Luck of Lucks".[14][18]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Ramparts, refers to an asterism consisting of Xi Aquarii, 46 Capricorni, 47 Capricorni, Lambda Capricorni, 50 Capricorni, 18 Aquarii, 29 Capricorni, 9 Aquarii, 8 Aquarii, Nu Aquarii, 14 Aquarii, 17 Aquarii and 19 Aquarii.[19] Consequently, the Chinese name for Xi Aquarii itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[20]

References

Template:Reflist

External links

Template:Stars of Aquarius

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  2. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Gullikson_et_al_2016
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaass19_91
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named sps1966
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apj188_291
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named al28_4_261
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apj629_1_507
  8. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Zorec_Royer_2012
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa515_A11
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named IAU-LSN
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Herr_1969
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named planetnaming
  14. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named allen1963
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named TriRpt18
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras55_429
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aquarii
  19. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  20. ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
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