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Kappa Boötis

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(Redirected fromΚ Boo)
Double star in the constellation of Boötes
κ Boötis
Location of κ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationBoötes
κ1 Boötis
Right ascension14h 13m 27.824s[1]
Declination+51° 47′ 16.62″[1]
Apparent magnitude (V)+6.69[2]
κ2 Boötis
Right ascension14h 13m 29.009s[3]
Declination+51° 47′ 23.88″[3]
Apparent magnitude (V)+4.50 to +4.58[4]
Characteristics
κ1 Boötis
Spectral typeF2V[5]
κ2 Boötis
Spectral typeA8IV[6]
U−Bcolor index0.14
B−Vcolor index0.2
R−Icolor index0.12
Variable typeDelta Scuti variable[4]
Astrometry
κ1 Boötis
Radial velocity (Rv)−22.09[1] km/s
Proper motion (μ)RA: 44.094[1]mas/yr
Dec.: −39.325[1]mas/yr
Parallax (π)20.3067±0.2221 mas[1]
Distance161 ± 2 ly
(49.2 ± 0.5 pc)
Absolute magnitude (MV)+3.34
κ2 Boötis
Radial velocity (Rv)−15.60[7] km/s
Proper motion (μ)RA: 44.094[3] mas/yr
Dec.: −39.325[3] mas/yr
Parallax (π)21.1980 ± 0.4118 mas[3]
Distance154 ± 3 ly
(47.2 ± 0.9 pc)
Details
κ1 Boötis
Mass1.40[8] M☉
Radius1.43[1] R☉
Luminosity3.801[1] L☉
Surface gravity (log g)4.32[5] cgs
Temperature6,699[9] K
Metallicity [Fe/H]−0.09[9] dex
Rotational velocity (v sin i)38[10] km/s
Age900[9] Myr
κ2 Boötis
Mass2.12[11] M☉
Radius2.78[11] R☉
Luminosity28[6] L☉
Surface gravity (log g)3.66[5] cgs
Temperature7,760[6] K
Metallicity [Fe/H]−0.29[12] dex
Rotational velocity (v sin i)128[8] km/s
Other designations
Asellus Tertius,κ Boo,17 Boötis,BD+52 1782,HR 5328
κ1 Boötis:HD 124674,HIP 69481,SAO 29045
κ2 Boötis: HD 124675, HIP 69483, SAO 29046
Database references
SIMBADdata
κ1
κ2

Kappa Boötis (κ Boo, κ Boötis) is adouble star in theconstellationBoötes. It has the traditional nameAsellus Tertius/əˈsɛləsˈtɜːrʃiəs/ (Latin for "thirddonkey colt")[13][14] and theFlamsteed designation 17 Boötis. The components are separated by anangular distance of 13.5 arcsec,[14] viewable in a small telescope. Kappa Boötis is approximately 155light years from Earth.

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 theBright Star Catalogue designation HR 5328, but they have separate entries in theHipparcos catalogue: HIP 69483 and HIP 69481 respectively.

Properties

[edit]
Avisual bandlight curve for Kappa2 Boötis, adapted from Frandsenet al. (1995)[15]

κ1 Boötis is aspectroscopic binary star system. The visible primary is an F2main sequence star, while the secondary is half the mass and much fainter.[16]

κ2 Boötis is classified as aDelta Scuti typevariable star with a period of 1.08 hours[6] Its brightness varies from magnitude +4.50 to +4.58.[4] It is a slightly evolved A8subgiant.

A 17th-magnitude star nearly twoarc-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 with two similar low-mass stars in a 234-year orbit.[17]

Etymology

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This star, along with the otherAselli (θ Boo andι Boo) andλ Boo, wereAulād al Dhiʼbah (أولاد الضّباع -awlād al-ḍibā‘), "the Whelps of the Hyenas".[18]

InChinese,天槍 (Tiān Qiāng), meaningCelestial Spear, refers to an asterism consisting of κ (actually κ2) Boötis,ι Boötis andθ Boötis.[19] Consequently, theChinese name for κ Boötis itself is天槍一 (Tiān Qiāng yī, English:the First Star of Celestial Spear.)[20]

References

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  1. ^abcdefghBrown, 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 atVizieR.
  2. ^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.
  3. ^abcdeBrown, 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 atVizieR.
  4. ^abcSamus, 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.
  5. ^abcGray, R. O.; Napier, M. G.; Winkler, L. I. (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.
  6. ^abcdBalona, 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.
  7. ^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.
  8. ^abZorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (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.
  9. ^abcCasagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.;Feltzing, S. (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.
  10. ^Royer, F.; Grenier, S.; Baylac, M. -O.; Gómez, A. E.; Zorec, J. (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.
  11. ^abLiakos, 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.
  12. ^Gáspár, András; Rieke, George H.; Ballering, Nicholas (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.
  13. ^Star Name - R.H.Allen p.105
  14. ^abKaler, Jim."Asellus Tertius". Retrieved2017-09-06.
  15. ^Frandsen, S.; Jones, A.; Kjeldsen, H.; Viskum, M.; Hjorth, J.; Andersen, N. H.; Thomsen, B. (September 1995)."CCD photometry of the δ-Scuti star κ2 Bootis".Astronomy and Astrophysics.301: 123.Bibcode:1995A&A...301..123F. Retrieved3 September 2022.
  16. ^Halbwachs, J. -L; Arenou, F.; Pourbaix, D.; Famaey, B.; Guillout, P.; Lebreton, Y.; Salomon, J. -B.; Tal-Or, L.; Ibata, R.; Mazeh, T. (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.
  17. ^Tokovinin, Andrei (2018-03-01)."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.
  18. ^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. Retrieved2010-12-12.
  19. ^(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.
  20. ^(in Chinese)香港太空館 - 研究資源 - 亮星中英對照表Archived 2010-08-11 at theWayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.

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