WR 140

WR 140

This image shows WR 140 and its nebula with JWST Mid-Infrared Instrument, taken in July 2022. The nebula is formed by the binary and only the innermost shells were previously imaged with Keck in 1999/2001.[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 20h 20m 27.97608s[2]
Declination +43° 51′ 16.2802″[2]
Apparent magnitude (V) 6.85[3]
Characteristics
Spectral type WC7p + O5[4]
Apparent magnitude (J) 5.547[5]
Apparent magnitude (K) 5.037[6]
U−B color index −0.35[3]
B−V color index +0.40[3]
Variable type WR[7]
Astrometry
Radial velocity (Rv)3.10[8] km/s
Proper motion (μ) RA: −4.653[9] mas/yr
Dec.: −2.047[9] mas/yr
Parallax (π)0.5815 ± 0.0286 mas[9]
Distance5,600 ± 300 ly
(1,720 ± 80 pc)
Absolute magnitude (MV)WR: −6.6 to −4.8
O: −6.11 to −5.94[10]
Orbit[11]
PrimaryO
CompanionWR
Period (P)7.9241+0.0037
−0.0035 yr
Semi-major axis (a)8.30+0.22
−0.23″
Eccentricity (e)0.9012±0.0034
Inclination (i)119.4+3.7
−3.4°
Longitude of the node (Ω)349.1±2.5°
Periastron epoch (T)MJD 1993.1825+0.0036
−0.0039
Argument of periastron (ω)
(primary)		42.31+0.70
−0.68°
Semi-amplitude (K1)
(primary)		29.3±1.8 km/s
Semi-amplitude (K2)
(secondary)		68.5+1.2
−1.1 km/s
Details
WR
Mass8.4[11] M☉
Luminosity537,000[12] L☉
Temperature70,000[12] K
O
Mass20.5[11] M☉
Radius35[12] R☉
Luminosity1,600,000[12] L☉
Temperature35,000[12] K
Other designations
V1687 Cygni, BD+43°3571, HD 193793, HIP 100287, TYC 3164-1678-1, SBC9 1232, WDS J20205+4351, 2MASS J20202798+4351164
Database references
SIMBADdata

WR 140 is a visually moderately bright Wolf–Rayet star placed within the spectroscopic binary star, SBC9 1232,[8] whose primary star is an evolved spectral class O4–5 star.[8] It is located in the constellation of Cygnus, lying in the sky at the centre of the triangle formed by Deneb, γ Cygni and δ Cygni.

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  8. ^ a b c Cite error: The named reference rv was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference monnier was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference aa2022 was invoked but never defined (see the help page).
  12. ^ a b c d e Cite error: The named reference williams was invoked but never defined (see the help page).