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Kappa Boötis

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κ Boötis
Location of κ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes[1]
κ1 Boötis
Right ascension 14h 13m 27.824s[2]
Declination +51° 47′ 16.62″[2]
Apparent magnitude (V) +6.69[3]
κ2 Boötis
Right ascension 14h 13m 29.008s[4]
Declination +51° 47′ 23.88″[4]
Apparent magnitude (V) +4.50 to +4.58[5]
Characteristics
κ1 Boötis
Spectral type F2V[6]
B−V color index 0.394±0.005[1]
κ2 Boötis
Spectral type A8IV[7]
U−B color index 0.14[citation needed]
B−V color index 0.2[citation needed]
R−I color index 0.12[citation needed]
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]
Distance161 ± 2 ly
(49.2 ± 0.5 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]
Distance161.8 ± 0.8 ly
(49.6 ± 0.2 pc)
Details
κ1 Boötis A
Mass1.40±0.02[9] M☉
Radius1.43+0.05
−0.10[2] R☉
Luminosity3.801+0.083
−0.082[2] L☉
Surface gravity (log g)4.32[6] cgs
Temperature6,744+254
−108[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] M☉
Radius2.78[12] R☉
Luminosity28[7] L☉
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
Asellus Tertius, κ Boo, 17 Boötis, BD+52 1782, HR 5328, WDS J14135+5147
κ1 Boötis: GC 19204, HD 124674, HIP 69481, SAO 29045, PPM 34402[14]
κ2 Boötis: GC 19207, HD 124675, HIP 69483, SAO 29046, PPM 34403[15]
Database references
SIMBADdata
κ1
κ2

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 /əˈsɛləs ˈtɜːrʃiəs/ 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 162 light-years (50 pc) from Earth.

Properties

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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

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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, 天槍 (Tiān Qiāng), 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 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)[23]

References

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  1. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. ^ a b c d e f g h Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR On-line Data Catalog. Bibcode:2002yCat.2237....0D.
  4. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  6. ^ a b c Gray, R. O.; et al. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148. Bibcode:2001AJ....121.2148G. doi:10.1086/319956. S2CID 117076031.
  7. ^ a b c d e Balona, L. A.; Dziembowski, W. A. (October 1999). "Excitation and visibility of high-degree modes in stars". Monthly Notices of the Royal Astronomical Society. 309 (1): 221–232. Bibcode:1999MNRAS.309..221B. doi:10.1046/j.1365-8711.1999.02821.x.
  8. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/s1063773706110065. S2CID 119231169.
  9. ^ a b c Zorec, J.; et al. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789.
  10. ^ a b Casagrande, L.; et al. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. S2CID 56118016.
  11. ^ Royer, F.; et al. (2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin I". Astronomy and Astrophysics. 393 (3): 897–911. arXiv:1201.2052. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. S2CID 14070763.
  12. ^ a b c Liakos, Alexios; Niarchos, Panagiotis (2017). "Catalogue and properties of δ Scuti stars in binaries". Monthly Notices of the Royal Astronomical Society. 465 (1): 1181. arXiv:1611.00200. Bibcode:2017MNRAS.465.1181L. doi:10.1093/mnras/stw2756. S2CID 119284575.
  13. ^ Gáspár, András; et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal. 826 (2): 171. arXiv:1604.07403. Bibcode:2016ApJ...826..171G. doi:10.3847/0004-637x/826/2/171. S2CID 119241004.
  14. ^ "kap01 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-05-28.
  15. ^ "kap02 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-05-28.
  16. ^ Allen, R. H. (1963). "Star Names, Their Lore and Meaning" (Dover ed.). p. 105. Retrieved 2025-05-28.
  17. ^ a b Kaler, Jim. "Asellus Tertius". Stars. Retrieved 2017-09-06.
  18. ^ Frandsen, S.; et al. (September 1995). "CCD photometry of the δ-Scuti star κ2 Bootis". Astronomy and Astrophysics. 301: 123. Bibcode:1995A&A...301..123F. Retrieved 3 September 2022.
  19. ^ Halbwachs, J. -L; et al. (2014). "Masses of the components of SB2 binaries observed with Gaia - I. Selection of the sample and mass ratios of 20 new SB2s discovered with Sophie". Monthly Notices of the Royal Astronomical Society. 445 (3): 2371. arXiv:1409.1384. Bibcode:2014MNRAS.445.2371H. doi:10.1093/mnras/stu1838. S2CID 119180931.
  20. ^ Tokovinin, Andrei (March 2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. S2CID 119047709.
  21. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 105. ISBN 978-0-486-21079-7. Retrieved 2010-12-12.{{cite book}}: CS1 maint: ignored ISBN errors (link)
  22. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  23. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2010-08-11 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
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