29 Cygni

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
SIMBADdata

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.

  1. ^ Cite error: The named reference Gies was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ a b c d e f g h i j Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Casas2009 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Rodríguez2000 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference derosa2014 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Malo2013 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Murphy2015 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Mkrtichian2007 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Bychkov2003 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference wds was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference dr3 was invoked but never defined (see the help page).


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