| Tau Swan | |||
|---|---|---|---|
| Double star | |||
  | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | 21 h 14 m 47.49252 s | ||
| Declination | + 38 ° 02 ′ 43.1441 ″ | ||
| Distance | 68.2 ± 0.9 St. years (20.9 ± 0.3 pc ) | ||
| Visible magnitude ( V ) | 3.65 - 3.75 [1] (3.80 / 6.69 [2] ) | ||
| Constellation | Swan | ||
| Astrometry | |||
| Radial velocity ( R v ) | -20.90 km / s | ||
| Own movement (μ) | RA: 196.99 mas per year Dec: 410.28 mas per year | ||
| Parallax (π) | 49.16 ± 0.4 mas | ||
| Absolute magnitude (V) | 2.21 / 5.00 [2] | ||
| Characteristics | |||
| Spectral class | F2 IV / G0 V | ||
| Color Index ( B - V ) | +0.38 / +0.60 | ||
| Color Index ( U - B ) | +0.03 / +0.09 | ||
| Variability | Type δ Shield [1] | ||
| physical characteristics | |||
| Temperature | |||
| Orbit elements | |||
| Period ( P ) | 2.2192 (810 days) years | ||
| Semimajor axis ( a ) | 0.796 " | ||
| Eccentricity ( e ) | 0.43 | ||
| Inclination ( i ) | 92.6 ° v | ||
| Node (Ω) | 78.7 ° | ||
| Periastric Age ( T ) | 2453139.5 | ||
| Pericenter Argument (ω) | 90 | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
| The star has 2 components Their parameters are presented below: | |||
| Sources: [5] | |||
Tau Cygni (τ Cyg, τ Cygni, τ Cygni) is a binary star system in the constellation Cygnus , at a distance of 68 light-years from Earth [7] with a circulation period of 49.6 years. [2]
The system components are the yellow-white subgiant GJ 822.1 A with the spectral class F2IV and the yellow star of the main sequence GJ 822.1 B with the spectral class G0V. The surface temperature of the main component is from 6000 to 7500 K. It is larger, hotter and several times brighter than the Sun. [8] The second component in size, luminosity and surface temperature is similar to the Sun. [9] Visible magnitudes are 3.84 and 6.44, respectively.
The amplitude of the change in the total brightness of the components of Tau Cygnus is in the range from 3.65 to 3.75 magnitude, although only component A is variable. [1] This feature allows us to classify Tau Cygnus as a variable of type δ Shield .
Notes
- ↑ 1 2 3 NN; Samus; Durlevich, OV et al. VizieR Online Data Catalog: General Catalog of Variable Stars (Samus + 2007-2013) (unknown) // VizieR On-line Data Catalog: B / gcvs. Originally Published In: 2009yCat .... 102025S. - 2009 .-- T. 1 . - S. B / gcvs . - .
- ↑ 1 2 3 4 5 6 7 8 9 10 Fuhrmann, Klaus (February 2008), " Nearby stars of the Galactic disc and halo - IV ", Monthly Notices of the Royal Astronomical Society T. 384 (1): 173–224 , DOI 10.1111 / j.1365-2966.2007.12671.x
- ↑ 1 2 3 4 Martin E. C. , Fajardo-Acosta S. , Gelino C. R. et al. The AllWISE motion survey, part 2 // The Astrophysical Journal : Supplement Series - 2016 .-- T. 224, no. 2. - S. 36–36. - ISSN 0067-0049 ; 1538-4365 - doi: 10.3847 / 0067-0049 / 224/2/36
- ↑ 1 2 3 4 Lacroute P., Valbousquet A. AGK3 catalog - 1971. - T. 7. - S. 153.
- ↑ Sixth Catalog of Orbits of Visual Binary Stars (link not available) . Date of treatment February 17, 2019. Archived August 1, 2017.
- ↑ J. Zorec, F. Royer Rotational velocities of A-type stars. IV. Evolution of rotational velocities // Astron. Astrophys. - EDP Sciences , 2012. - Vol. 537. - P. 120-120. - 22 p. - ISSN 0004-6361 ; 0365-0138 ; 1432-0746 ; 1286-4846 - doi: 10.1051 / 0004-6361 / 201117691 - arXiv: 1201.2052
- ↑ * tau Cyg . SIMBAD Center de données astronomiques de Strasbourg . Date of treatment October 18, 2007.
- ↑ * tau Cyg A . SIMBAD Center de données astronomiques de Strasbourg . Date of treatment October 18, 2007.
- ↑ * tau Cyg B . SIMBAD Center de données astronomiques de Strasbourg . Date of treatment October 18, 2007.