AZ Cygni

AZ Cygni

AZ Cygni seen by the CHARA array.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 20h 57m 59.4444s[1]
Declination +46° 28′ 00.583″[1]
Apparent magnitude (V) 7.8 – 9.6[2]
Characteristics
Evolutionary stage Red supergiant
Spectral type M3 Iab[3][4][5]
(M2–4 Iab)[6][7]
Apparent magnitude (U) 13.91[3]
Apparent magnitude (B) 10.897±0.065[8]
Apparent magnitude (G) 6.190986±0.010832[1]
Apparent magnitude (T) 4.618±0.018[8]
Apparent magnitude (J) 2.765±0.234[8]
Apparent magnitude (H) 1.744±0.164[8]
Apparent magnitude (K) 1.22[9]–1.288±0.172[8]
B−V color index +2.56[3]
J−K color index +1.48[2]
Variable type SRc[2]
Astrometry
Radial velocity (Rv)−5.52±0.99[1] km/s
Proper motion (μ) RA: −1.905±0.031[1] mas/yr
Dec.: −2.871±0.029[1] mas/yr
Parallax (π)0.4027 ± 0.027 mas[1]
Distance6,820+420
−380[10] ly
(2,090+130
−115[10] pc)
Absolute magnitude (MV)–5.32[11]
Details
Mass15[10] – 20±9[12] M☉
Radius911+57
−50[10] R☉
Luminosity109,800[10](94,800 – 249,400)[10] L☉
Surface gravity (log g)−0.5 – 0.0,[10] cgs
Temperature3,989±117[12] (3,972 – 4,000)[10] K
Metallicity [Fe/H]0.0[10][12][13] dex
Other designations
AZ Cyg, BD+45 3349, TYC 3575-553-1, 2MASS J20575942+4628004, SAO 50296[14]
Database references
SIMBADdata

AZ Cygni (BD+45 3349) is a large red supergiant (M3 Iab)[3] in the constellation of Cygnus. Located 2,090 parsecs (6,800 ly) from Earth, it has been studied by the CHARA array in order to understand the surface variations of red supergiants.[10]

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