Kappa Tauri

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Template:Short description

Kappa Tauri
Observation data
Epoch J2000.0      Equinox
Constellation Taurus
κ1 Tau
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.22[2]
κ2 Tau
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +5.24[2]
Characteristics
κ1 Tau
Spectral type A7IV-V[3]
U−B Template:Engvar +0.12[2]
B−V Template:Engvar +0.14[2]
κ2 Tau
Spectral type A7V
U−B Template:Engvar +0.09[2]
B−V Template:Engvar +0.17[2]
Astrometry
κ1 Tau
Radial velocity (Rv)+37.30[4] km/s
Proper motion (μ) RA: +105.10[1] mas/yr
Dec.: −45.04[1] mas/yr
Parallax (π)21.19±0.21 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.96[5]
κ2 Tau
Radial velocity (Rv)+32.00[6] km/s
Proper motion (μ) RA: +111.97[1] mas/yr
Dec.: −47.71[1] mas/yr
Parallax (π)22.03±0.35 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+2.18[5]
Details
κ1 Tau
Radius2.60[7] Template:Solar radius
Luminosity33.6[8] Template:Solar luminosity
Temperature9,000[7] K
Rotational velocity (v sin i)94[9] km/s
κ2 Tau
Luminosity11.8[8] Template:Solar luminosity
Temperature7,400[8] K
Metallicity [Fe/H] dex
Rotational velocity (v sin i)191[9] km/s
Other designations
κ Tau, ADS 3201
κ1 Tau: 65 Tauri, BD+21 642, HD 27934, HIP 20635, HR 1387, SAO 76601[10]
κ2 Tau: 67 Tauri, BD+21 643, HD 27946, HIP 20641, HR 1388, SAO 76602[11]
Database references
SIMBADκ1 Tau
κ2 Tau

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Kappa Tauri (κ Tau, κ Tauri) is a double star in the constellation Taurus, the two components κ1 Tauri and κ2 Tauri both members of the Hyades open cluster. The pair are approximately 150 light years from Earth and are separated from each other by about six light years.

System

File:Iades and Pleiades (32446251210).jpg
Pleiades and Hyades with κ Tauri as the very close pair at lower centre (north is approximately to the left)

The system is dominated by a visual double star, κ1 Tauri and κ2 Tauri. κ1 Tauri is a white A-type subgiant with an apparent magnitude of +4.22.[2] It is emitting an excess of infrared radiation at a temperature indicating there is a circumstellar disk in orbit at a radius of 67 AU from the star.[7] κ2 Tauri is a white A-type main sequence star with an apparent magnitude of +5.24.[2]

Between the two bright stars is a binary star made up of two 9th magnitude stars, Kappa Tauri C and Kappa Tauri D, which are 5.5 arcseconds from each other (as of 2013) and 175.1 arcseconds from κ1 Tau. Two more 12th magnitude companions fill out the visual group: Kappa Tauri E, which is 145 arcseconds from κ1 Tau, and Kappa Tauri F, 108.5 arcseconds away from κ2 Tau.[12]

The bright pair are both members of the Hyades star cluster, while the fainter stars are all much more distant background stars.[13]

Test of General Relativity

File:1919 eclipse negative.jpg
One of the 1919 eclipse negatives, with κ1 and κ2 Tauri marked near the centre of the image

Kappa Tauri was photographed during the solar eclipse of May 29, 1919 by the expedition of Arthur Eddington in Príncipe and others in Sobral, Brazil that confirmed Albert Einstein's prediction of the bending of light around the Sun from his general theory of relativity which he published in 1915.[14]

Naming

Template:Flowlist

References

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  8. ↑ a b c Script error: No such module "citation/CS1".
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  10. ↑ Template:Cite simbad
  11. ↑ Template:Cite simbad
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Taurus

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