29 Cygni

29 Cygni is a single[8] star in the northern constellation of Cygnus. It is dimly visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.93.[2] The distance to 29 Cyg, as estimated from an annual parallax shift of 24.9 mas,[1] is 131 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −17 km/s.[2] It is a member of the 30–50 million year old Argus Association of co-moving stars.[10]

This article is about b3 Cygni. For other stars with this Bayer designation, see b Cygni.
29 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension  20h 14m 32.03199s[1]
Declination +36° 48′ 22.6846″[1]
Apparent magnitude (V) 4.93[2]
Characteristics
Evolutionary stage main sequence[3][4]
Spectral type A2 V[5]
B−V color index 0.151±0.018[2]
Variable type δ Sct[6]
Astrometry
Radial velocity (Rv)−17.30±2.80[2] km/s
Proper motion (μ) RA: +68.391[1] mas/yr
Dec.: +70.446[1] mas/yr
Parallax (π)24.9257 ± 0.1747[1] mas
Distance130.9 ± 0.9 ly
(40.1 ± 0.3 pc)
Absolute magnitude (MV)1.78[2]
Details
Mass2.14±0.15[3] M☉
Radius1.2[7] R☉
Luminosity25.2+3.7
−3.1[3] L☉
Surface gravity (log g)4.12±0.2565[4] cgs
Temperature8,790+1,513
−1,292[3] K
Rotational velocity (v sin i)65[3] km/s
Age40[8] Myr
Other designations
b3 Cygni, 29 Cyg, V1644 Cygni, BD+36°3955, HD 192640, HIP 99770, HR 7736, SAO 69678, WDS J20145+3648A[9]
Database references
SIMBADdata

This is an A-type main-sequence star with a stellar classification of A2 V.[5] Rodríguez et al. (2000) classify it as a Delta Scuti variable with a frequency of 0.0267 cycles per day.[6] It is a Lambda Boötis[11] class chemically peculiar star and the first such star to be classified as a pulsating variable.[4] 29 Cyg is multi-periodic,[12] small-amplitude variable with a magnitude change of about 0.02 and a dominant period of 39 minutes.[4] A magnetic field has been detected with an averaged quadratic field of (194.5±230.7)×10−4 T.[13] The star has a moderate rate of rotation,[4] showing a projected rotational velocity of 65 km/s.[3] It has double[3] the mass of the Sun and is radiating 25[3] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,790 K.[3]

29 Cygni is listed in multiple star catalogs as having several companions within 4′, including the yellow 7th magnitude HD 192661. All are background objects not physically associated with 29 Cygni itself.[14][15] The naked-eye stars b1 Cygni and b2 Cygni, respectively about one and two degrees away, also lie at different distances to 29 Cygni.

References
  1. 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.
  2. 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.
  3. Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, A120.
  4. Casas, R.; et al. (May 2009), "Asteroseismological Modeling of the Multiperiodic λ Bootis Star 29 Cygni", The Astrophysical Journal, 697 (1): 52–534, Bibcode:2009ApJ...697..522C, doi:10.1088/0004-637X/697/1/522, hdl:10481/41210
  5. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  6. Rodríguez, E.; et al. (June 2000), "A revised catalogue of delta Sct stars", Astronomy and Astrophysics Supplement, 144: 469–474, Bibcode:2000A&AS..144..469R, doi:10.1051/aas:2000221.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
  9. "29 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-13.
  10. Malo, Lison; et al. (January 2013), "Bayesian Analysis to Identify New Star Candidates in Nearby Young Stellar Kinematic Groups", The Astrophysical Journal, 762 (2): 50, arXiv:1209.2077, Bibcode:2013ApJ...762...88M, doi:10.1088/0004-637X/762/2/88, 88.
  11. Murphy, Simon J.; et al. (October 2015), "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue", Publications of the Astronomical Society of Australia, 32: 43, arXiv:1508.03633, Bibcode:2015PASA...32...36M, doi:10.1017/pasa.2015.34, e036
  12. Mkrtichian, D. E.; et al. (October 2007), "Multimode Pulsations of the λ Bootis Star 29 Cygni: The 1995 and 1996 Multisite Campaigns", The Astronomical Journal, 134 (4): 1713, Bibcode:2007AJ....134.1713M, doi:10.1086/521434.
  13. Bychkov, V. D.; et al. (August 2003), "Catalogue of averaged stellar effective magnetic fields. I. Chemically peculiar A and B type stars", Astronomy and Astrophysics, 407 (2): 631–642, arXiv:astro-ph/0307356, Bibcode:2003A&A...407..631B, doi:10.1051/0004-6361:20030741.
  14. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  15. 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.
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