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Kappa Aquilae

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κかっぱ Aquilae
Location of κかっぱ Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 36m 53.44952s[1]
Declination –7° 01′ 38.9176″[1]
Apparent magnitude (V) +4.957[2]
Characteristics
Spectral type B0.5 III[3]
U−B color index –0.861[2]
B−V color index –0.028[2]
Astrometry
Radial velocity (Rv)–19.4[4] km/s
Proper motion (μみゅー) RA: +1.63[1] mas/yr
Dec.: –2.65[1] mas/yr
Parallax (πぱい)1.94 ± 0.20 mas[1]
Distanceapprox. 1,700 ly
(approx. 520 pc)
Absolute magnitude (MV)−3.60[5]
Details
Mass15.50 ± 0.61[6] M☉
Radius12.5[7] R☉
Luminosity52,630[6] L☉
Surface gravity (log g)3.5[8] cgs
Temperature26,500[6] K
Metallicity [Fe/H]−0.16[5] dex
Rotational velocity (v sin i)265[9] km/s
Age11.1 ± 0.5[3] Myr
Other designations
κかっぱ Aql, 39 Aquilae, BD–07 5006, FK5 737, HD 184915, HIP 96483, HR 7446, SAO 143600.[10]
Database references
SIMBADdata

Kappa Aquilae, Latinized from κかっぱ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. It is a faint star at apparent visual magnitude +4.957,[2] but bright enough to be seen with the naked eye in dark suburban skies. The annual parallax is only 1.94 mas,[1] which equates to a distance of approximately 1,700 light-years (520 parsecs) from Earth (with a 10% margin of error).

The spectrum of Kappa Aquilae matches a stellar classification of B0.5 III,[3] where the luminosity class of III is typically associated with evolved giant stars. This is a star with 15.50[6] times the Sun's mass and 12.5[7] times the radius of the Sun. Massive stars like this blaze brightly; it is radiating 52,630-fold[6] the Sun's luminosity from its outer atmosphere with an effective temperature of 26,500 K,[6] giving it the intense blue-white glow of a B-type star. It is only 11 million years of age[3] and is spinning rapidly with a projected rotational velocity of 265 km/s.[9]

Etymology

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In Chinese, 右みぎ旗はた (Yòu Qí), meaning Right Flag, refers to an asterism consisting of κかっぱ Aquilae, μみゅー Aquilae, σしぐま Aquilae, δでるた Aquilae, νにゅー Aquilae, 42 Aquilae, ιいおた Aquilae, HD 184701 and 56 Aquilae.[11] Consequently, the Chinese name for κかっぱ Aquilae itself is 右みぎ旗はた八はち (Yòu Qí bā, English: the Eighth Star of Right Flag.)[12]

This star, together with ηいーた Aql, θしーた Aql, δでるた Aql, ιいおた Aql and λらむだ Aql were once part of the now-obsolete constellation Antinous.[13]

References

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  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, Bibcode:1966PDAUC...1....1G.
  3. ^ a b c d Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
  4. ^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
  5. ^ a b 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, S2CID 119257644.
  6. ^ a b c d e f Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483.
  7. ^ a b Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society, 189 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601.
  8. ^ Frémat, Y.; et al. (September 2005), "Effects of gravitational darkening on the determination of fundamental parameters in fast-rotating B-type stars", Astronomy and Astrophysics, 440 (1): 305–320, arXiv:astro-ph/0503381, Bibcode:2005A&A...440..305F, doi:10.1051/0004-6361:20042229, S2CID 19016751.
  9. ^ a b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  10. ^ "* kap Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-01-13.
  11. ^ (in Chinese) 中國ちゅうごく星座せいざ神話しんわ, written by 陳ひね久金ひさがね. Published by 台灣たいわん書房しょぼう出版しゅっぱん有限ゆうげん公司こうし, 2005, ISBN 978-986-7332-25-7.
  12. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文てんもん教育きょういく資し訊網 2006 年ねん 7 月がつ 3 日にち
  13. ^ Ian Ridpath's Star Tales - Antinous
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