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Kappa Cygni

October 15, 2023

Kappa Cygni, Latinized from κ Cygni, is a star in the northern constellation of Cygnus. It has an apparent visual magnitude of 3.8,[2] which is bright enough to be seen with the naked eye. In the constellation, it forms the tip of Cygnus's left wing.[9] The radiant of the minor Kappa Cygnids meteor shower is located about 5° north of this star.[10]

κ Cygni
Location of κ Cygni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 19h 17m 06.16865s[1]
Declination +53° 22′ 06.4534″[1]
Apparent magnitude (V) 3.814[2]
Characteristics
Spectral type G9 III[3]
U−B color index +0.767[2]
B−V color index +0.965[2]
Astrometry
Radial velocity (Rv)–29.3[4] km/s
Proper motion (μ) RA: +60.07[1] mas/yr
Dec.: +122.83[1] mas/yr
Parallax (π)26.27 ± 0.10 mas[1]
Distance124.2 ± 0.5 ly
(38.1 ± 0.1 pc)
Absolute magnitude (MV)+0.90[5]
Details
Radius8–9[6] R☉
Luminosity51[5] L☉
Surface gravity (log g)2.7[7] cgs
Temperature4,920[7] K
Metallicity [Fe/H]0.13 ± 0.07[8] dex
Rotational velocity (v sin i)3.7[7] km/s
Other designations
κ Cyg, 1 Cygni, BD+53° 2216, FK5 726, HD 181276, HIP 94779, HR 7328, SAO 31537, Angie C.G (Star registration)
Database references
SIMBADdata

Examination of this star's spectrum show it to match a stellar classification of G9 III,[3] with the 'III' luminosity class revealing that it has consumed the hydrogen fuel at its core and expanded into the giant star stage of its stellar evolution. It is known to vary in luminosity, but only by about 0.01 to 0.02 magnitudes.[11] The measured angular diameter of this star, after correction for limb darkening, is 2.07 ± 0.09 mas.[12] At an estimated distance of 124.2 light-years (38.1 parsecs) based on parallax measurements,[1] this yields a physical size of about 8–9 times the radius of the Sun.[6] The outer envelope has an effective temperature of 4,920 K,[7] giving it the yellow-orange hue of a star near the transition from a G- to a K-type classification.[13]

References Edit

  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 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants.", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667
  3. ^ a b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29–50, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333
  4. ^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, Veröffentlichungen des Astronomisches Rechen-Institut Heidelberg, 35: 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 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
     
  7. ^ a b c d Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
  8. ^ Puzeras, E.; et al. (October 2010), "High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements", Monthly Notices of the Royal Astronomical Society, 408 (2): 1225–1232, arXiv:1006.3857, Bibcode:2010MNRAS.408.1225P, doi:10.1111/j.1365-2966.2010.17195.x, S2CID 44228180
  9. ^ Consolmagno, Guy; Davis, Dan M. (2011), Turn Left at Orion: Hundreds of Night Sky Objects to See in a Home Telescope - and How to Find Them (4th ed.), Cambridge University Press, p. 134, ISBN 978-0-521-15397-3
  10. ^ Stegmüller, Wolfgang (1979), The structuralist view of theories: a possible analogue of the Bourbaki programme in physical science, Astronomers' Observing Guides, Springer, p. 82, ISBN 0-387-09460-1
  11. ^ Adelman, Saul J. (2001), "On the Photometric Variability of Red Clump Giants", Baltic Astronomy, 10 (4): 593–597, Bibcode:2001BaltA..10..593A, doi:10.1515/astro-2001-0404
  12. ^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
  13. ^ , Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16

October 15, 2023
kappa, cygni, latinized, from, cygni, star, northern, constellation, cygnus, apparent, visual, magnitude, which, bright, enough, seen, with, naked, constellation, forms, cygnus, left, wing, radiant, minor, meteor, shower, located, about, north, this, star, cyg. Kappa Cygni Latinized from k Cygni is a star in the northern constellation of Cygnus It has an apparent visual magnitude of 3 8 2 which is bright enough to be seen with the naked eye In the constellation it forms the tip of Cygnus s left wing 9 The radiant of the minor Kappa Cygnids meteor shower is located about 5 north of this star 10 k CygniLocation of k Cygni circled Observation dataEpoch J2000 0 Equinox J2000 0Constellation CygnusRight ascension 19h 17m 06 16865s 1 Declination 53 22 06 4534 1 Apparent magnitude V 3 814 2 CharacteristicsSpectral type G9 III 3 U B color index 0 767 2 B V color index 0 965 2 AstrometryRadial velocity Rv 29 3 4 km sProper motion m RA 60 07 1 mas yr Dec 122 83 1 mas yrParallax p 26 27 0 10 mas 1 Distance124 2 0 5 ly 38 1 0 1 pc Absolute magnitude MV 0 90 5 DetailsRadius8 9 6 R Luminosity51 5 L Surface gravity log g 2 7 7 cgsTemperature4 920 7 KMetallicity Fe H 0 13 0 07 8 dexRotational velocity v sin i 3 7 7 km sOther designationsk Cyg 1 Cygni BD 53 2216 FK5 726 HD 181276 HIP 94779 HR 7328 SAO 31537 Angie C G Star registration Database referencesSIMBADdataExamination of this star s spectrum show it to match a stellar classification of G9 III 3 with the III luminosity class revealing that it has consumed the hydrogen fuel at its core and expanded into the giant star stage of its stellar evolution It is known to vary in luminosity but only by about 0 01 to 0 02 magnitudes 11 The measured angular diameter of this star after correction for limb darkening is 2 07 0 09 mas 12 At an estimated distance of 124 2 light years 38 1 parsecs based on parallax measurements 1 this yields a physical size of about 8 9 times the radius of the Sun 6 The outer envelope has an effective temperature of 4 920 K 7 giving it the yellow orange hue of a star near the transition from a G to a K type classification 13 References Edit 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 amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Jennens P A Helfer H L September 1975 A new photometric metal abundance and luminosity calibration for field G and K giants Monthly Notices of the Royal Astronomical Society 172 3 667 679 Bibcode 1975MNRAS 172 667J doi 10 1093 mnras 172 3 667 a b Morgan W W Keenan P C 1973 Spectral Classification Annual Review of Astronomy and Astrophysics 11 29 50 Bibcode 1973ARA amp A 11 29M doi 10 1146 annurev aa 11 090173 000333 Wielen R et al 1999 Sixth Catalogue of Fundamental Stars FK6 Part I Basic fundamental stars with direct solutions Veroff Astron Rechen Inst Heidelb Veroffentlichungen des Astronomisches Rechen Institut Heidelberg 35 1 Bibcode 1999VeARI 35 1W 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 a b Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3 ed Birkhauser ISBN 3 540 29692 1 The radius R is given by 2 R 10 3 38 1 2 07 AU 0 0046491 AU R 17 R displaystyle begin aligned 2 cdot R amp frac 10 3 cdot 38 1 cdot 2 07 text AU 0 0046491 text AU R bigodot amp approx 17 cdot R bigodot end aligned nbsp a b c d Massarotti Alessandro et al January 2008 Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity The Astronomical Journal 135 1 209 231 Bibcode 2008AJ 135 209M doi 10 1088 0004 6256 135 1 209 Puzeras E et al October 2010 High resolution spectroscopic study of red clump stars in the Galaxy iron group elements Monthly Notices of the Royal Astronomical Society 408 2 1225 1232 arXiv 1006 3857 Bibcode 2010MNRAS 408 1225P doi 10 1111 j 1365 2966 2010 17195 x S2CID 44228180 Consolmagno Guy Davis Dan M 2011 Turn Left at Orion Hundreds of Night Sky Objects to See in a Home Telescope and How to Find Them 4th ed Cambridge University Press p 134 ISBN 978 0 521 15397 3 Stegmuller Wolfgang 1979 The structuralist view of theories a possible analogue of the Bourbaki programme in physical science Astronomers Observing Guides Springer p 82 ISBN 0 387 09460 1 Adelman Saul J 2001 On the Photometric Variability of Red Clump Giants Baltic Astronomy 10 4 593 597 Bibcode 2001BaltA 10 593A doi 10 1515 astro 2001 0404 Richichi A Percheron I Khristoforova M February 2005 CHARM2 An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773 777 Bibcode 2005A amp A 431 773R doi 10 1051 0004 6361 20042039 The Colour of Stars Australia Telescope Outreach and Education Commonwealth Scientific and Industrial Research Organisation December 21 2004 archived from the original on March 18 2012 retrieved 2012 01 16 Retrieved from https en wikipedia org w index php title Kappa Cygni amp oldid 1093247712, wikipedia, wiki, book, books, library,

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