Τ_Cygni

Tau Cygni

Tau Cygni

Variable star in the constellation Cygnus

Not to be confused with T Cygni.

Tau Cygni, Latinised from τ Cygni, is a binary star system in the constellation Cygnus, approximately 69 light years away from Earth.[4] This visual binary system has a period of 49.6 years.[2]

Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...

The main star, 4th magnitude GJ 822.1 A, is a yellowish white subgiant star of the spectral type F2IV. It therefore has a surface temperature of 6,000 to 7,500 kelvins and is larger, hotter, and several times as bright as the Sun.[5] Its companion, 6th magnitude GJ 822.1 B, is a yellow main sequence star of the spectral type G0V. It is similar to the Sun in size, surface temperature, and luminosity.[6]

Tau Cygni is classified as a δ Scuti variable. The magnitude range is given as 3.65 to 3.75, which is the combined magnitude for both components, although the variable component is A.[1]

References

  1. [1]
    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.
  2. [2]
    Fuhrmann, Klaus (February 2008), "Nearby stars of the Galactic disc and halo - IV", Monthly Notices of the Royal Astronomical Society, 384 (1): 173–224, Bibcode:2008MNRAS.384..173F, doi:10.1111/j.1365-2966.2007.12671.x
  3. [3]
    "Sixth Catalog of Orbits of Visual Binary Stars". Archived from the original on 2017-08-01. Retrieved 2016-12-26.
  4. [4]
    "* tau Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 18, 2007.
  5. [5]
    "* tau Cyg A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 18, 2007.
  6. [6]
    "* tau Cyg B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 18, 2007.
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