WR 22

WR 22

WR 22 in the Carina nebula
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 41m 17.51590s[1]
Declination −59° 40′ 36.8957″[1]
Apparent magnitude (V) 6.42[2]
Characteristics
Spectral type WN7h + O9III-V[3]
Apparent magnitude (U) 5.68[2]
Apparent magnitude (B) 6.50[2]
Apparent magnitude (J) 5.705[4]
Apparent magnitude (H) 5.578[4]
Apparent magnitude (K) 5.389[4]
U−B color index −0.82[2]
B−V color index 0.08[2]
J−H color index 0.127[4]
J−K color index 0.316[4]
Variable type Eclipsing binary[5]
Astrometry
Radial velocity (Rv)−28.00[6] km/s
Proper motion (μ) RA: −7.321[7] mas/yr
Dec.: 3.091[7] mas/yr
Parallax (π)0.3953 ± 0.0348 mas[7]
Distance8,300 ± 700 ly
(2,500 ± 200 pc)
Absolute magnitude (MV)−6.73 + −4.44[5]
Orbit[8]
PrimaryWR
CompanionO
Period (P)80.336 days[9]
Semi-major axis (a)330 R☉
Eccentricity (e)0.598
Inclination (i)83.5[9]°
Argument of periastron (ω)
(secondary)		268.2°
Semi-amplitude (K1)
(primary)		70.6 km/s
Semi-amplitude (K2)
(secondary)		190.0 km/s
Details
WR
Mass49 - 75[10] M☉
Radius22.65[10] R☉
Luminosity1,905,000[10] L☉
Temperature44,700[10][11] K
O
Mass25.7[12] M☉
Radius11[12] R☉
Luminosity130,000[12] L☉
Temperature33,000[12] K
Age2.2[11] Myr
Other designations
CD−59°3221, HR 4188, HD 92740, V429 Carinae, HIP 52308
Database references
SIMBADdata

WR 22, also known as V429 Carinae or HR 4188, is an eclipsing binary star system in the constellation Carina. The system contains a Wolf-Rayet (WR) star that is one of the most massive and most luminous stars known, and is also a bright X-ray source due to colliding winds with a less massive O class companion. Its eclipsing nature and apparent magnitude make it very useful for constraining the properties of luminous hydrogen-rich WR stars.[9]

  1. ^ a b Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. ^ a b c d e Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ Gagné, M.; Fehon, G.; Savoy, M. R.; Cartagena, C. A.; Cohen, D. H.; Owocki, S. P. (2012). "An X-Ray Survey of Colliding Wind Binaries". Proceedings of a Scientific Meeting in Honor of Anthony F. J. Moffat Held at Auberge du Lac Taureau. 465: 301. arXiv:1205.3510. Bibcode:2012ASPC..465..301G.
  4. ^ a b c d e Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  5. ^ a b Gosset, E.; Nazé, Y.; Sana, H.; Rauw, G.; Vreux, J.-M. (2009). "Phase-resolved XMM-Newton observations of the massive WR+O binary WR 22". Astronomy and Astrophysics. 508 (2): 805. Bibcode:2009A&A...508..805G. doi:10.1051/0004-6361/20077981.
  6. ^ Kharchenko, N. V.; Scholz, R.-D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  7. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  8. ^ Cite error: The named reference revised was invoked but never defined (see the help page).
  9. ^ a b c Lenoir-Craig, G.; Antokhin, I. I.; Antokhina, E. A.; St-Louis, N.; Moffat, A F J. (2021). "On the nature of the single eclipse per 80d orbit of the H-rich luminous WN star WR22". Monthly Notices of the Royal Astronomical Society. 510: 246–259. arXiv:2111.09400. doi:10.1093/mnras/stab3374.
  10. ^ a b c d Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; Gamen, R. C.; Arias, J. I.; Alfaro, E. J.; Oskinova, L. M. (2019). "The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters". Astronomy & Astrophysics. A57: 625. arXiv:1904.04687. Bibcode:2019A&A...625A..57H. doi:10.1051/0004-6361/201834850. S2CID 104292503.
  11. ^ a b Gräfener, G.; Hamann, W.-R. (2008). "Mass loss from late-type WN stars and its Z-dependence. Very massive stars approaching the Eddington limit". Astronomy and Astrophysics. 482 (3): 945. arXiv:0803.0866. Bibcode:2008A&A...482..945G. doi:10.1051/0004-6361:20066176. S2CID 16025012.
  12. ^ a b c d Parkin, E. R.; Gosset, E. (2011). "Investigating the X-ray emission from the massive WR+O binary WR 22 using 3D hydrodynamical models". Astronomy & Astrophysics. 530: A119. arXiv:1104.2383. Bibcode:2011A&A...530A.119P. doi:10.1051/0004-6361/201016125. S2CID 55645991.