Xi Geminorum

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Template:Short description

Xi Geminorum
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.35[2]
Characteristics
Spectral type F5 IV-V[3]
U−B Template:Engvar +0.06[4]
B−V Template:Engvar +0.43[4]
Astrometry
Radial velocity (Rv)+25.6[2] km/s
Proper motion (μ) RA: –115.73[1] mas/yr
Dec.: –190.55[1] mas/yr
Parallax (π)55.56±0.19 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)2.14[5]
Details
Mass1.706 ± 0.012[6] Template:Solar mass
Radius2.710 ± 0.021[6] Template:Solar radius
Luminosity11.574 ± 0.238[6] Template:Solar luminosity
Surface gravity (log g)3.81 ± 0.02[7] cgs
Temperature6,480 ± 39[6] K
Metallicity [Fe/H]0.00 ± 0.01[7] dex
Rotational velocity (v sin i)66.1 ± 3.3[8] km/s
Age1.5[9] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Xi Geminorum (ξ Geminorum, abbreviated Xi Gem, ξ Gem), formally named Alzirr Template:IPAc-en,[11] is a star in the zodiac constellation of Gemini. It forms one of the four feet of the outline demarcating the Gemini twins.[12] The star has an apparent visual magnitude of 3.35,[2] which is bright enough for it to be seen with the naked eye. From stellar parallax measurements, its distance from the Sun can be estimated as Template:Convert.[1]

Nomenclature

ξ Geminorum (Latinised to Xi Geminorum) is the star's Bayer designation.

It bore the traditional name of Al Zirr or Alzirr, from the Arabic الزِرّ al-zirr "the button".[13] In 2016, the IAU organized a Working Group on Star Names (WGSN)[14] to catalog and standardize proper names for stars. The WGSN approved the name Alzirr for this star on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[11]

This star, along with Gamma Geminorum (Alhena), Mu Geminorum, Nu Geminorum and Eta Geminorum were al-hanʽah "the brand" (on the neck of the camel). They also were associated in al-nuḥātai, the dual form of al-nuḥāt, "the camel's hump".[13]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Well (asterism), refers to an asterism consisting of Xi Geminorum, Mu Geminorum, Nu Geminorum, Gamma Geminorum, Epsilon Geminorum, 36 Geminorum, Zeta Geminorum and Lambda Geminorum.[15] Consequently, Xi Geminorum itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[16]

Properties

Although generally considered a single star, there is some evidence that Xi Geminorum may instead be a spectroscopic binary system consisting of two component stars of equal mass.[17]

Xi Geminorum has a stellar classification of F5 IV-V, which is subgiant star that is in the process of evolving away from the main sequence of stars like the Sun. It has about 162%[5] of the Sun's mass and is radiating more than 11 times the luminosity of the Sun.[7] This energy is being emitted from the outer envelope of the star at an effective temperature of 6,464 K.[7] This causes the star to take on the yellow-white hue common to F-type stars.[18]

X-ray emission has been detected from this star, which has an estimated X-ray luminosity of 1.06 × 1029 erg s−1.[5] It has the spectroscopic signature of a rapidly rotating star, with a projected rotational velocity of about 66 km s−1.[8]

References

Template:Reflist

External links

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Template:Stars of Gemini

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  2. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named scfs
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named nstars
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named clpl4
  5. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named aaa361_614
  6. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named apj746_1_101
  7. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aaa400_241
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa446_1_267
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa501_3_941
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  11. ↑ a b Script error: No such module "citation/CS1".
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named omeara
  13. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named allen1963
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ 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.
  16. ↑ 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.
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras411_4_2311
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csiro
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