Kappa Boötis

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Template:Short description

κ Boötis
Template:Location mark
Location of κ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes[1]
κ1 Boötis
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +6.69[3]
κ2 Boötis
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) +4.50 to +4.58[5]
Characteristics
κ1 Boötis
Spectral type F2V[6]
B−V Template:Engvar 0.394±0.005[1]
κ2 Boötis
Spectral type A8IV[7]
U−B Template:Engvar 0.14Script error: No such module "Unsubst".
B−V Template:Engvar 0.2Script error: No such module "Unsubst".
R−I Template:Engvar 0.12Script error: No such module "Unsubst".
Variable type Delta Scuti variable[5]
Astrometry
κ1 Boötis
Radial velocity (Rv)−22.09[2] km/s
Proper motion (μ) RA: 44.094 mas/yr[2]
Dec.: −39.325 mas/yr[2]
Parallax (π)20.3067±0.2221 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+3.29[1]
κ2 Boötis
Radial velocity (Rv)−15.60[8] km/s
Proper motion (μ) RA: 61.899 mas/yr[4]
Dec.: −9.615 mas/yr[4]
Parallax (π)20.1530±0.0943 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
κ1 Boötis A
Mass1.40±0.02[9] Template:Solar mass
Radius1.43Script error: No such module "Su".[2] Template:Solar radius
Luminosity3.801Script error: No such module "Su".[2] Template:Solar luminosity
Surface gravity (log g)4.32[6] cgs
Temperature6,744Script error: No such module "Su".[2] K
Metallicity [Fe/H]−0.09[10] dex
Rotational velocity (v sin i)38[11] km/s
Age900[10] Myr
κ2 Boötis
Mass2.12[12] Template:Solar mass
Radius2.78[12] Template:Solar radius
Luminosity28[7] Template:Solar luminosity
Surface gravity (log g)3.66[6] cgs
Temperature7,760[7] K
Metallicity [Fe/H]−0.29[13] dex
Rotational velocity (v sin i)128[9] km/s
Other designations
Template:Odlist
κ1 Boötis: Template:Odlist[14]
κ2 Boötis: Template:Odlist[15]
Database references
SIMBADdata
κ1
κ2

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Kappa Boötis is a double star in the constellation Boötes. Its name is a Bayer designation that is Latinized from κ Boötis, and abbreviated Kappa Boo or κ Boo. This star has the traditional name Asellus Tertius, which is pronouced Template:IPAc-en and is Latin for "third donkey colt".[16][17] The components have an angular separation of 13.5 arcsec;[17] viewable in a small telescope. Kappa Boötis is approximately Script error: No such module "convert". from Earth.

Properties

File:Kappa2BooLightCurve.png
A visual band light curve for Kappa2 Boötis, adapted from Frandsen et al. (1995)[18]

κ1 Boötis is itself a double-lined spectroscopic binary star system. The primary component is an F-type main-sequence star star of class F2V, while the secondary is half the mass and much fainter.[19]

κ2 Boötis is classified as a Delta Scuti type variable star with a period of 1.08 hours[7] Its brightness varies from magnitude +4.50 to +4.58.[5] It is a slightly evolved A8 subgiant, which indicates the hydrogen at its core is all but exhausted. This star has more than double the mass of the Sun and nearly three times its girth.[12] It has a high rate of spin, showing a projected rotational velocity of 128 km/s.[9] The star is radiating 28 times the luminosity of the Sun from its photosphere at an effective temperature of 7,760 K.[7]

A 17th-magnitude star nearly two arc-minutes away has been identified as a member of the multiple system with an estimated orbital period of 177,000 years. It is itself a close binary system consisting of two similar low-mass stars in a 234-year orbit.[20]

Nomenclature

κ2 Boötis, the brighter star of the pair, is also designated HD 124675, while κ1 Boötis is HD 124674. The two stars share the Bright Star Catalogue designation HR 5328 and the Flamsteed designation 17 Boötis, but they have separate entries in the Hipparcos catalogue: HIP 69483 and HIP 69481 respectively.

This star, along with the other Aselli (θ Boo and ι Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - awlād al-ḍibā), "the Whelps of the Hyenas".[21]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Spear, refers to an asterism consisting of κ (actually κ2) Boötis, ι Boötis and θ Boötis.[22] Consequently, the Chinese name for κ Boötis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[23]

References

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  1. ↑ a b c Template:Cite XHIP
  2. ↑ a b c d e f g h Template:Cite DR2
  3. ↑ Script error: No such module "Citation/CS1".
  4. ↑ a b c d Template:Cite Gaia DR3
  5. ↑ a b c Script error: No such module "Citation/CS1".
  6. ↑ a b c Script error: No such module "Citation/CS1".
  7. ↑ a b c d e Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b c Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ a b c Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Template:Cite simbad
  15. ↑ Template:Cite simbad
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ a b Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Script error: No such module "Citation/CS1".
  20. ↑ Script error: No such module "Citation/CS1".
  21. ↑ Script error: No such module "citation/CS1".
  22. ↑ 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.
  23. ↑ 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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External links

Template:Stars of Boötes

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