A visual band light curve of V832 Cygni. The main plot shows the long-term variability, and the inset plot shows the variation over a single orbital period. Adapted from Harmanec et al. (2002) [1] | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 59m 49.55164s [2] |
Declination | +47° 31′ 15.3789″ [2] |
Apparent magnitude (V) | 4.74 [3] |
Characteristics | |
Spectral type | B1.5Vnne [4] + sdO + A3V + A8III + ? [5] |
B−V color index | −0.084±0.004 [3] |
Variable type | γ Cas [6] |
Astrometry | |
Radial velocity (Rv) | 1.4±4.2 [3] km/s |
Proper motion (μ) |
RA: +9.534
[2]
mas/
yr Dec.: +3.090 [2] mas/ yr |
Parallax (π) | 2.5088 ± 0.3226 mas [2] |
Distance | approx. 1,300
ly (approx. 400 pc) |
Absolute magnitude (MV) | −3.37 [3] |
Orbit [7] | |
Period (P) | 28.1871±0.0011 d |
Eccentricity (e) | 0.141±0.008 |
Periastron epoch (T) | 45677.6±0.3 HJD |
Argument of periastron (ω) (secondary) | 257±4° |
Semi-amplitude (K1) (primary) | 11.7±0.9 km/s |
Semi-amplitude (K2) (secondary) | 121.3±1.1 km/s |
Details [7] | |
59 Cyg Aa – Be star | |
Mass | 6.3–9.4 M☉ |
Radius | 5.5–7.0 R☉ |
Luminosity | 7,943 L☉ |
Surface gravity (log g) | 3.78±0.09 cgs |
Temperature | 21,800±700 K |
Rotational velocity (v sin i) | 379±27 km/s |
59 Cyg Aa – sdO | |
Mass | 0.62–0.91 M☉ |
Radius | 0.34–0.43 R☉ |
Luminosity | 1,000 L☉ |
Surface gravity (log g) | 5.0±1.0 cgs |
Temperature | 52,100±4,800 K |
Rotational velocity (v sin i) | < 40 km/s |
Other designations | |
Database references | |
SIMBAD | data |
59 Cygni is a multiple [7] star system in the northern constellation of Cygnus, located roughly 1,300 light years away from Earth. It is visible to the naked eye as a blue-white hued star with a combined apparent visual magnitude of 4.74. [3]
The primary component and brightest member of this system, designated 59 Cyg Aa, is a rapidly rotating Be star with a stellar classification of B1.5 Vnne. [4] This is a well-studied star thanks to pronounced spectral variations that have been observed since 1916, and two short-term shell star phases that were observed in 1973 and 1974–5. [9] It is actually a confirmed spectroscopic binary system with a high temperature subdwarf O-type companion in a 28-day orbital period. The latter is heating the nearest side of the circumstellar gaseous disk that surrounds the primary. [7]
Orbiting the primary pair is 59 Cyg Ab, a magnitude 7.64 A-type main-sequence star of class A3V, located at an angular separation of 0.200″. A fourth component is a magnitude 9.8 A-type giant star of class A8III at a separation of 20.2″ along a position angle (PA) of 352°, as of 2008. The fifth companion is magnitude 11.7 at a separation of 26.7″ and a PA of 141°. [5] Gaia Data Release 2 suggests that the companions at 20.2″ and 26.7″ are respectively 382 pc and 366 pc away and moving in approximately the same direction as the primary triple. [10] [11]
A visual band light curve of V832 Cygni. The main plot shows the long-term variability, and the inset plot shows the variation over a single orbital period. Adapted from Harmanec et al. (2002) [1] | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 59m 49.55164s [2] |
Declination | +47° 31′ 15.3789″ [2] |
Apparent magnitude (V) | 4.74 [3] |
Characteristics | |
Spectral type | B1.5Vnne [4] + sdO + A3V + A8III + ? [5] |
B−V color index | −0.084±0.004 [3] |
Variable type | γ Cas [6] |
Astrometry | |
Radial velocity (Rv) | 1.4±4.2 [3] km/s |
Proper motion (μ) |
RA: +9.534
[2]
mas/
yr Dec.: +3.090 [2] mas/ yr |
Parallax (π) | 2.5088 ± 0.3226 mas [2] |
Distance | approx. 1,300
ly (approx. 400 pc) |
Absolute magnitude (MV) | −3.37 [3] |
Orbit [7] | |
Period (P) | 28.1871±0.0011 d |
Eccentricity (e) | 0.141±0.008 |
Periastron epoch (T) | 45677.6±0.3 HJD |
Argument of periastron (ω) (secondary) | 257±4° |
Semi-amplitude (K1) (primary) | 11.7±0.9 km/s |
Semi-amplitude (K2) (secondary) | 121.3±1.1 km/s |
Details [7] | |
59 Cyg Aa – Be star | |
Mass | 6.3–9.4 M☉ |
Radius | 5.5–7.0 R☉ |
Luminosity | 7,943 L☉ |
Surface gravity (log g) | 3.78±0.09 cgs |
Temperature | 21,800±700 K |
Rotational velocity (v sin i) | 379±27 km/s |
59 Cyg Aa – sdO | |
Mass | 0.62–0.91 M☉ |
Radius | 0.34–0.43 R☉ |
Luminosity | 1,000 L☉ |
Surface gravity (log g) | 5.0±1.0 cgs |
Temperature | 52,100±4,800 K |
Rotational velocity (v sin i) | < 40 km/s |
Other designations | |
Database references | |
SIMBAD | data |
59 Cygni is a multiple [7] star system in the northern constellation of Cygnus, located roughly 1,300 light years away from Earth. It is visible to the naked eye as a blue-white hued star with a combined apparent visual magnitude of 4.74. [3]
The primary component and brightest member of this system, designated 59 Cyg Aa, is a rapidly rotating Be star with a stellar classification of B1.5 Vnne. [4] This is a well-studied star thanks to pronounced spectral variations that have been observed since 1916, and two short-term shell star phases that were observed in 1973 and 1974–5. [9] It is actually a confirmed spectroscopic binary system with a high temperature subdwarf O-type companion in a 28-day orbital period. The latter is heating the nearest side of the circumstellar gaseous disk that surrounds the primary. [7]
Orbiting the primary pair is 59 Cyg Ab, a magnitude 7.64 A-type main-sequence star of class A3V, located at an angular separation of 0.200″. A fourth component is a magnitude 9.8 A-type giant star of class A8III at a separation of 20.2″ along a position angle (PA) of 352°, as of 2008. The fifth companion is magnitude 11.7 at a separation of 26.7″ and a PA of 141°. [5] Gaia Data Release 2 suggests that the companions at 20.2″ and 26.7″ are respectively 382 pc and 366 pc away and moving in approximately the same direction as the primary triple. [10] [11]