Kappa Boötis

κ Boötis
	Location of κ Boötis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Boötes
	κ1 Boötis
Right ascension	14h 13m 27.824s
Declination	+51° 47′ 16.62″
Apparent magnitude (V)	+6.69
	κ2 Boötis
Right ascension	14h 13m 29.009s
Declination	+51° 47′ 23.88″
Apparent magnitude (V)	+4.50 to +4.58
Characteristics
κ1 Boötis
Spectral type	F2V
κ2 Boötis
Spectral type	A8IV
U−B color index	0.14
B−V color index	0.2
R−I color index	0.12
Variable type	Delta Scuti variable
Astrometry
κ1 Boötis
Radial velocity (Rv)	−22.09 km/s
Proper motion (μ)	RA: 44.094 mas/yr ; Dec.: −39.325 mas/yr
Parallax (π)	20.3067 ± 0.2221 mas
Distance	161 ± 2 ly ; (49.2 ± 0.5 pc)
Absolute magnitude (MV)	+3.34
κ2 Boötis
Radial velocity (Rv)	−15.60 km/s
Proper motion (μ)	RA: 44.094 mas/yr ; Dec.: −39.325 mas/yr
Parallax (π)	21.1980 ± 0.4118 mas
Distance	154 ± 3 ly ; (47.2 ± 0.9 pc)
Details
κ1 Boötis
Mass	1.40 M☉
Radius	1.43 R☉
Luminosity	3.801 L☉
Surface gravity (log g)	4.32 cgs
Temperature	6,699 K
Metallicity [Fe/H]	−0.09 dex
Rotational velocity (v sin i)	38 km/s
Age	900 Myr
κ2 Boötis
Mass	2.12 M☉
Radius	2.78 R☉
Luminosity	28 L☉
Surface gravity (log g)	3.66 cgs
Temperature	7,760 K
Metallicity [Fe/H]	−0.29 dex
Rotational velocity (v sin i)	128 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
SIMBAD	data
	κ1
	κ2

Kappa Boötis (κ Boo, κ Boötis) is a double star in the constellation Boötes. It has the traditional name Asellus Tertius /əˈsɛləs ˈtɜːrʃiəs/ (Latin for "third donkey colt")^[13]^[14] and the Flamsteed designation 17 Boötis. The components are separated by an angular distance of 13.5 arcsec,^[14] viewable in a small telescope. Kappa Boötis is approximately 155 light years from Earth.

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, but they have separate entries in the Hipparcos catalogue: HIP 69483 and HIP 69481 respectively.

Properties

A visual band light curve for Kappa² Boötis, adapted from Frandsen *et al.* (1995)^[15]

κ¹ Boötis is a spectroscopic binary star system. The visible primary is an F2 main sequence star, while the secondary is half the mass and much fainter.^[16]

κ² Boötis is classified as a Delta Scuti type variable 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 A8 subgiant.

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 with two similar low-mass stars in a 234-year orbit.^[17]

Etymology

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".^[18]

In Chinese, 天槍 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of κ (actually κ²) Boötis, ι Boötis and θ Boötis.^[19] Consequently, the Chinese name for κ Boötis itself is 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)^[20]

References

^ ^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.
^ 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.
^ ^a ^b ^c ^d ^e 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.
^ ^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.
^ ^a ^b ^c Gray, 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.
^ ^a ^b ^c ^d 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.
^ 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.
^ ^a ^b Zorec, 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.
^ ^a ^b ^c Casagrande, 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.
^ 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.
^ ^a ^b 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.
^ 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.
^ Star Name - R.H.Allen p.105
^ ^a ^b Kaler, Jim. "Asellus Tertius". Retrieved 2017-09-06.
^ 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. Retrieved 3 September 2022.
^ 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.
^ 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.
^ 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.
^ (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.
^ (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.

External links

[dr2_1-1] ^ ^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.

[ubv-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.

[dr2_2-3] 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.

[gcvs-4] 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.

[gray-5] Gray, 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.

[mnras309_1_221-6] 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.

[pulkovo-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.

[zorec-8] Zorec, 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.

[casagrande-9] Casagrande, 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.

[royer-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.

[liakos-11] 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.

[gaspar-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.

[Allen-13] Star Name - R.H.Allen p.105

[Kaler-14] Kaler, Jim. "Asellus Tertius". Retrieved 2017-09-06.

[Frandsen-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. Retrieved 3 September 2022.

[halbwachs-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.

[msc-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.

[Allen2-18] 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. Retrieved 2010-12-12.

[zh-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.

[lcsd-20] (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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Kappa Boötis

Nomenclature

Properties

Etymology

References

External links

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