Iota Aurigae

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Template:Short description

ι Aurigae
Template:Location mark
Location of ι Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 2.69[3]
Characteristics
Spectral type K3 II–III[4]
U−B Template:Engvar +1.78[3]
B−V Template:Engvar +1.53[3]
R−I Template:Engvar +0.82[4]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)+17.78[5] km/s
Proper motion (μ) RA: +3.817 mas/yr[2]
Dec.: −17.786 mas/yr[2]
Parallax (π)7.2491±0.3819 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−3.20[1]
Details
Mass7.1±0.7[6] Template:Solar mass
Radius126[7] Template:Solar radius
LuminosityTemplate:Val[7] Template:Solar luminosity
TemperatureTemplate:Val[7] K
Metallicity [Fe/H]−0.11[8] dex
Rotational velocity (v sin i)8[9] km/s
Age39.8±4.9[6] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Iota Aurigae is a star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ι Aurigae, abbreviated Iota Aur or ι Aur. The star has the official name Hassaleh, pronounced Template:IPAc-en.[11] It has an apparent visual magnitude of 2.7,[3] which is bright enough to be readily visible to the naked eye. Parallax measurements give a distance estimate of roughly Template:Convert from the Sun.[2] It is drifting further away with a radial velocity of +18 km/s.[5]

Nomenclature

ι Aurigae (Latinised to Iota Aurigae) is the star's Bayer designation.

It bore the traditional name Al Kab,[12] short for Kabdhilinan Template:IPAc-en, from the Arabic Script error: No such module "Lang". Template:Transliterate[13][14] "the ankle[15] of the rein holder (charioteer)".[12] Under the name Alkab, this star is a marker on the astrolabe described by Geoffrey Chaucer in his Treatise on the Astrolabe in 1391.

It bore the novel name Hassaleh in Antonín Bečvář's 1951 atlas. The origin and meaning of the name have not been discovered despite extensive search, and no connection to any language has been discovered.[16] The IAU Working Group on Star Names (WGSN)has approved the proper name Hassaleh for this star.[11]

It is known as 五車一 (the First Star of the Five Chariots) in Chinese.[17]

Properties

At Iota Aurigae's distance, extinction from interstellar dust is causing a magnitude reduction of about 0.6.[12] Examination of the spectrum yields a stellar classification of K3 II–III, with the luminosity class of 'II–III' indicating this is a evolved hybrid giant star.[4] Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[18] The effective temperature of the outer envelope is 4,160 K,[8] which is cooler than the Sun's effective temperature and gives Iota Aurigae the orange hue of a K-type star.[19]

It is a weak X-ray emitter with an X-ray luminosity of about Template:Val. This emission is most likely coming from transient loops of plasma in Iota Aurigae's outer atmosphere, which have a temperature of around 3 million K.[20] This is a suspected variable star.[4]

During the Extreme Solar Systems conference held on June 25–29, 2007, in Santorini, Greece, Reffert et al. announced the detection of two substellar objects orbiting Iota Aurigae in 2:1 resonance. Such companions would be brown dwarfs with orbital periods of approximately 2 and 4 years. No minimum mass for the candidates was provided. As of 2008, the detection has not been confirmed, though Hekker et al. (2008) listed significant radial velocity variations at periods of 767 and 1586 days.[21][22] It may instead be an oscillating star undergoing non-radial pulsations with a period of about four years.[4]

References

Template:Reflist

External links

Template:Stars of Auriga

  1. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  2. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  3. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named clpl4_99
  4. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Strassmeier_et_al_2020
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa430_165
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named mnras410_1_190
  7. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named tycho-gaia
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apjss74_1075
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csrv
  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. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named kaler
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named allen1899
  14. ↑ ʿAbd al-Raḥmān ibn ʿUmar al-Ṣūfī. صور الكواكب الثابتة (Book of Fixed Stars). Manuscript from the National Library of France.
  15. ↑ Translation of the Arabic word كعب to English on the Almaany dictionaries website.
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kunitzsch
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Startales
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named baas25_1319
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csiro
  20. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj431_1_402
  21. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa480_1_215
  22. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Reffert et al.
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