55 Cygni
 Location of 55 Cyg (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 48m 56.29119s[1] |
| Declination | +46° 06′ 50.8824″[1] |
| Apparent magnitude (V) | 4.86[2] (4.81 - 4.87[3]) |
| Characteristics | |
| Spectral type | B2.5Ia[4] - B4Ia[5] |
| U−B color index | −0.45[2] |
| B−V color index | +0.42[2] |
| Variable type | L[3] or α Cyg[6] |
| Astrometry | |
| Radial velocity (Rv) | −7.2[7] km/s |
| Proper motion (μ) | RA: −2.65[1] mas/yr Dec.: −2.84[1] mas/yr |
| Parallax (π) | 1.40 ± 0.17[1] mas |
| Distance | 830[8] pc |
| Absolute magnitude (MV) | −6.93[8] - −7.26[9] |
| Details[6] | |
| Mass | 23[9] M☉ |
| Radius | 54 - 65 R☉ |
| Luminosity | 324,000 - 478,000 L☉ |
| Surface gravity (log g) | 2.35 - 2.50 cgs |
| Temperature | 18,600 - 19,000 K |
| Rotational velocity (v sin i) | 61[9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
55 Cygni (55 Cyg) is a blue supergiant star in the constellation Cygnus. It is thought to be a member of the Cygnus OB7 stellar association at about 2,700 light years.
Its apparent magnitude is 4.86, but this is slightly variable and the star is also called V1661 Cyg. When first analysed, it was classified as an irregular supergiant variable,[10] but subsequent studies have treated it as an Alpha Cygni variable. It shows pulsations with multiple periods from a few hours to 22 days, and both p- and g-modes.[6] The spectrum also shows variation, leading to different classifications being given for the star.[11]
The exact properties of 55 Cygni are not known precisely and are also variable. It is a hot luminous supergiant several hundred thousand times as luminous as the sun. This star was originally a standard for the B3 Ia spectral type.[12]
The type of pulsations that 55 Cyg exhibits suggest that it was previously a red supergiant that has shed its outer layers. The most massive red supergiants are expected to pass through a blue supergiant phase before becoming a Wolf-Rayet star and eventually exploding as a type Ib or Ic supernova.[6]
References
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