Eta Aurigae

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η Aurigae
Template:Location mark
Location of η Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 3.18[3]
Characteristics
Spectral type B3 V[4]
U−B Template:Engvar −0.66[5]
B−V Template:Engvar −0.18[5]
R−I Template:Engvar −0.17[6]
Variable type SPB[6]
Astrometry
Radial velocity (Rv)+7.3[3] km/s
Proper motion (μ) RA: +31.45 mas/yr[2]
Dec.: −67.87 mas/yr[2]
Parallax (π)13.40±0.20 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.18[1]
Details
MassScript error: No such module "val".[7] Template:Solar mass
RadiusScript error: No such module "val".[7] Template:Solar radius
LuminosityScript error: No such module "val".[7] Template:Solar luminosity
Surface gravity (log g)4.13±0.04[8] cgs
TemperatureScript error: No such module "val".[7] K
Rotational velocity (v sin i)95[9] km/s
AgeScript error: No such module "val".[7] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Eta Aurigae is a star in the northern constellation of Auriga. Its identifier is a Bayer designation that is Latinized from η Aurigae, and abbreviated Eta Aur or η Aur. The star is officially named Haedus, pronounced Template:IPAc-en.[11][12] With an apparent visual magnitude of 3.18,[3] it is visible to the naked eye. Based upon parallax measurements made during the Hipparcos mission,[2] this star is approximately Script error: No such module "convert". distant from the Sun. It is receding with a radial velocity of +7 km/s.[3]

Nomenclature

File:Eta Aurigae.jpg
η Aurigae in optical light

η Aurigae (Latinised to Eta Aurigae) is the star's Bayer designation.

Along with Zeta Aurigae it represents one of the kids of the she-goat Capella, from which it derived its Latin traditional name Haedus II or Hoedus II, from the Latin haedus "kid" (Zeta Aurigae was Haedus I). It also had the less common traditional name Mahasim, from the Arabic المِعْصَم al-miʽşam "the wrist" (of the charioteer), which it shared with Theta Aurigae. In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN approved the names Haedus for Eta Aurigae and Saclateni for Zeta Aurigae A on 30 June 2017 and they are both now so included in the List of IAU-approved Star Names.[12]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Pillars, refers to an asterism consisting of Eta Aurigae, Epsilon Aurigae, Zeta Aurigae, Upsilon Aurigae, Nu Aurigae, Tau Aurigae, Chi Aurigae and 26 Aurigae.[14] Consequently, the Chinese name for Eta Aurigae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[15]

Properties

File:EtaAurLightCurve.png
A light curve for Eta Aurigae, plotted from TESS data.[16] The 1.29 day primary period is marked in red.

Since 1943, the spectrum of Eta Aurigae has served as one of the stable anchor points by which other stars are classified.[4]

Eta Aurigae is larger than the Sun, with more than five times the Sun's mass and over three times its radius.[7] The spectrum of this star matches a stellar classification of B3 V,[4] which is a B-type main-sequence star that is generating its energy through the nuclear fusion of hydrogen at its core. It is a chemically peculiar star and a slowly pulsating B-type star with a primary period of 1.29 days.[6] This star is radiating 1,450 times the Sun's luminosity from its photosphere at an effective temperature of Script error: No such module "val"..[7] Based upon its projected rotational velocity of 95 km/s,[9] it is spinning with a rotation period of only 1.8 days.[17] Eta Aurigae is around 39 million years old.[18]

References

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  1. ↑ a b Template:Cite XHIP
  2. ↑ a b c d e Script error: No such module "citation/CS1".
  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ a b c Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b c Script error: No such module "citation/CS1".
  7. ↑ a b c d e f g Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ Template:Cite simbad
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ a b Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ 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.
  15. ↑ 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.
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Auriga

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