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This article is about b3 Cygni. For other stars with this Bayer designation, see b Cygni.
29 Cygni

A yellow-light light curve for V1644 Cygni, adapted from Gies and Percy (1977) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Cygnus
Right ascension 20h 14m 32.03235s [2]
Declination +36° 48′ 22.7009″ [2]
Apparent magnitude (V) 4.94 - 4.97 [3]
Characteristics
Evolutionary stage main sequence [4] [5]
Spectral type A2 V [6]
B−V color index 0.151±0.018 [7]
Variable type δ Sct [8]
Astrometry
Radial velocity (Rv)−17.30±2.80 [7] km/s
Proper motion (μ) RA: +68.391 [2]  mas/ yr
Dec.: +70.446 [2]  mas/ yr
Parallax (π)24.5456 ± 0.0724  mas [2]
Distance132.9 ± 0.4  ly
(40.7 ± 0.1  pc)
Absolute magnitude (MV)1.78 [7]
Details
Mass2.14±0.15 [4]  M☉
Radius2.16 [4] [a]  R☉
Luminosity25.2+3.7
−3.1 [4]  L☉
Surface gravity (log g)4.12±0.2565 [5]  cgs
Temperature8,790+1,513
−1,292 [4]  K
Rotational velocity (v sin i)65 [4] km/s
Age40 [9]  Myr
Other designations
b3 Cygni, 29 Cyg, V1644 Cygni, BD+36°3955, HD 192640, HIP 99770, HR 7736, SAO 69678, WDS J20145+3648A, 2MASS J20143203+3648225 [10]
Database references
SIMBAD data

29 Cygni is a single [9] 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. [7] The distance to 29 Cyg, as estimated from an annual parallax shift of 24.5  mas, is 133  light years. The star is moving closer to the Earth with a heliocentric radial velocity of −17 km/s. [7] It is a member of the 30–50 million year old Argus Association of co-moving stars. [11]

This is an A-type main-sequence star with a stellar classification of A2 V. [6] Rodríguez et al. (2000) classify it as a Delta Scuti variable with a frequency of 0.0267 cycles per day. [8] It is a Lambda Boötis [12] class chemically peculiar star and the first such star to be classified as a pulsating variable. [5] 29 Cyg is multi-periodic, [13] small-amplitude variable with a magnitude change of about 0.02 and a dominant period of 39 minutes. [5] A magnetic field has been detected with an averaged quadratic field of (194.5±230.7)×10−4  T. [14] The star has a moderate rate of rotation, [5] showing a projected rotational velocity of 65 km/s. [4] It has double [4] the mass of the Sun and is radiating 25 [4] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,790 K. [4]

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. [15] [16] The naked-eye stars b1 Cygni and b2 Cygni, respectively about one and two degrees away, also lie at different distances to 29 Cygni.

Planetary system

Direct imaging of 29 Cygni b by the Subaru Telescope.

In 2022, a superjovian extrasolar planet HIP 99770 b was discovered by direct imaging and astrometry. Its spectral class is between L7 and L9.5, corresponding to a surface temperature of 1400±100 K. [17]

The 29 Cygni planetary system [17]
Companion
(in order from star) 		Mass Semimajor axis
( AU) 		Orbital period
( years) 		Eccentricity Inclination Radius
b 13.9+6.1
−5.1  MJ 		16.9+3.4
−1.9 		11900+3800
−1200 		0.25+0.14
−0.16 		148+13
−11 ° 		1  RJ

Notes

  1. ^ Radius calculated with temperature and luminosity

References

  1. ^ Gies, Douglas R.; Percy, John R. (February 1977). "Photometric variability of 29 Cygni". The Astronomical Journal. 82 (2): 166–168. Bibcode: 1977AJ.....82..166G. doi: 10.1086/112023.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID  244398875. Gaia DR3 record for this source at VizieR.
  3. ^ 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.
  4. ^ a b c d e f g h i j 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, S2CID  55586789, A120.
  5. ^ a b c d e 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, S2CID  120924176
  6. ^ a b 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.
  7. ^ a b c d e 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.
  8. ^ a b Rodríguez, E.; et al. (June 2000), "A revised catalogue of delta Sct stars", Astronomy and Astrophysics Supplement, 144 (3): 469–474, Bibcode: 2000A&AS..144..469R, doi: 10.1051/aas:2000221, hdl: 10261/226673.
  9. ^ a b 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, S2CID  88503488.
  10. ^ "29 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-13.
  11. ^ 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, S2CID  118497872, 88.
  12. ^ 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, S2CID  59405545, e036
  13. ^ 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.
  14. ^ 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, S2CID  14184105.
  15. ^ 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.
  16. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID  244398875.
  17. ^ a b Currie, Thayne; et al. (2023), "Direct imaging and astrometric detection of a gas giant planet orbiting an accelerating star", Science, 380 (6641): 198–203, arXiv: 2212.00034, doi: 10.1126/science.abo6192, PMID  37053312
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