Tau Cygni
  | ||
| Observation data Epoch J2000.0 Equinox J2000.0 | ||
|---|---|---|
| Constellation | Cygnus | |
| Right ascension | 21h 14m 47.4916s | |
| Declination | +38° 02′ 43.141″ | |
| Apparent magnitude (V) | 3.65 - 3.75[1] (3.80 / 6.69[2]) | |
| Characteristics | ||
| Spectral type | F2 IV + G0 V | |
| U−B color index | +0.03 / +0.09 | |
| B−V color index | +0.38 / +0.60 | |
| Variable type | δ Sct[1] | |
Argument of periastron (ω)(secondary) | 90° | |
| Details | ||
| τ Cyg A | ||
dex | ||
| τ Cyg B | ||
| Mass | 1.03[2] M☉ | |
| Radius | 0.93[2] R☉ | |
| Surface gravity (log g) | 4.52[2] cgs | |
| Temperature | 5,670[2] K | |
HR 8130, SAO 71121, GC 29723, CCDM J21148+3803AB. | ||
| Database references | ||
| SIMBAD | data | |
| A | ||
| B | ||
Tau Cygni, Latinised from τ Cygni, is a
The main star, 4th magnitude GJ 822.1 A, is a yellowish white
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
- ^ Bibcode:2009yCat....102025S.
- ^
- ^ "Sixth Catalog of Orbits of Visual Binary Stars". Archived from the original on 2017-08-01. Retrieved 2016-12-26.
- ^ "* tau Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 18, 2007.
- ^ "* tau Cyg A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 18, 2007.
- ^ "* tau Cyg B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 18, 2007.