V453 Cygni
Variable Star in the constellation Cygnus
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V453 Cygni (also designated HD 227696 or BD+35° 3964) is a detached eclipsing binary star system located in the constellation of Cygnus. It consists of two massive early B-type subgiant stars in a short-period, slightly eccentric orbit. The system is a member of the young open cluster NGC 6871 and exhibits β Cephei type pulsations in its primary component, making it a key object for studying the evolution and internal structure of high-mass stars.[5][4][6] Another star system similar to V453 Cygni is HD 227586 (B0.5IVp).[7]
Location of V453 Cygni | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 06m 34.97s[1] |
| Declination | +35° 44′ 26.3″[1] |
| Apparent magnitude (V) | 8.29 - 8.72[2] |
| Characteristics | |
| Variable type | Algol[2] |
| A | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B0.4IV[4] |
| Variable type | β Cep[5] |
| B | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B0.7IV[4] |
| Astrometry | |
| Radial velocity (Rv) | -15 km/s |
| Proper motion (μ) | RA: -3.129 mas/yr Dec.: -6.605 mas/yr |
| Parallax (π) | 0.5263±0.0333 mas |
| Distance | 6,200 ± 400 ly (1,900 ± 100 pc) |
| Details[3] | |
| A | |
| Mass | 14.36 ± 0.20 M☉ |
| Radius | 8.55 ± 0.06 R☉ |
| Temperature | 27 900 ± 400 K |
| B | |
| Mass | 11.11 ± 0.13 M☉ |
| Radius | 5.49 ± 0.06 R☉ |
| Temperature | 26 200 ± 500 K |
| Other designations | |
| MCW 794, V453 Cygni, BD+35 3964, HD 227696, SAO 69422, TIC 90349611, 2MASS J20063496+3544262[1] | |
| Database references | |
| SIMBAD | data |
Observation
V453 Cygni was identified as a variable star in the early 20th century. Detailed photometric observations in the 1960s and 1970s revealed its eclipsing nature, with apsidal motion detected in 1973. High-resolution spectroscopy and light curve analyses in the 2000s provided precise absolute dimensions, confirming its membership in NGC 6871. In 2020, data from NASA's Transiting Exoplanet Survey Satellite (TESS) revealed β Cephei-type pulsations in the primary star, marking V453 Cygni as the first such pulsating star with a dynamically measured precise mass.[5][8]