Kappa Boötis
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
κ1 Boötis | |
Right ascension | 14h 13m 27.824s[1] |
Declination | +51° 47′ 16.62″[1] |
Apparent magnitude (V) | +6.69[2] |
κ2 Boötis | |
Right ascension | 14h 13m 29.009s[3] |
Declination | +51° 47′ 23.88″[3] |
Apparent magnitude (V) | +4.50 to +4.58[4] |
Characteristics | |
κ1 Boötis | |
Spectral type | F2V[5] |
κ2 Boötis | |
Spectral type | A8IV[6] |
U−B color index | 0.14 |
B−V color index | 0.2 |
R−I color index | 0.12 |
Variable type | Delta 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] |
Distance | 161 ± 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] |
Distance | 154 ± 3 ly (47.2 ± 0.9 pc) |
Details | |
κ1 Boötis | |
Mass | 1.40[8] M☉ |
Radius | 1.43[1] R☉ |
Luminosity | 3.801[1] L☉ |
Surface gravity (log g) | 4.32[5] cgs |
Temperature | 6,699[9] K |
Metallicity [Fe/H] | -0.09[9] dex |
Rotational velocity (v sin i) | 38[10] km/s |
Age | 900[9] Myr |
κ2 Boötis | |
Mass | 2.12[11] M☉ |
Radius | 2.78[11] R☉ |
Luminosity | 28[6] L☉ |
Surface gravity (log g) | 3.66[5] cgs |
Temperature | 7,760[6] K |
Metallicity [Fe/H] | -0.29[12] dex |
Rotational velocity (v sin i) | 128[8] km/s |
Other designations | |
κ1 Boötis: HR 5328, HD 124674, HIP 69481, SAO 29045 | |
κ2 Boötis: HR 5328, 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
This star, along with the other Aselli (θ Boo and ι Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - aulād al dhiʼba), "the Whelps of the Hyenas".[15]
In Chinese, 天槍 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of κ (actually κ2) Boötis, ι Boötis and θ Boötis.[16] Consequently, the Chinese name for κ Boötis itself is 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)[17]
Properties
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.[18]
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.
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.
- ^ 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.
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: CS1 maint: unflagged free DOI (link) - ^ 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.
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: CS1 maint: unflagged free DOI (link) - ^ Star Name - R.H.Allen p.105
- ^ a b Kaler, Jim. "Asellus Tertius". Retrieved 2017-09-06.
- ^ 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.
- ^ 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.
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: CS1 maint: unflagged free DOI (link)