CW Leonis

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CW Leonis
CW Leonis UV.jpg
CW Leonis in ultraviolet showing the bowshock
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 09h 47m 57.406s[1]
Declination +13° 16′ 43.56″[1]
Apparent magnitude (V) 10.96 - 14.80[2]
Spectral type C9,5e[3]
Apparent magnitude (R) 10.96[1]
Apparent magnitude (J) 7.34[1]
Apparent magnitude (H) 4.04[1]
Apparent magnitude (K) 1.19[1]
Variable type Mira[2]
Proper motion (μ) RA: 35 ± 1 mas/yr
Dec.: 12 ± 1[4] mas/yr
Parallax (π)10.56 ± 2.02[5] mas
Distanceapprox. 310 ly
(approx. 90 pc)
Mass0.7 - 0.9[4] M
Radius390 - 500[6], 700[7] - 826[8] R
Diameter390 - 500[6], 700[7] - 826[8] D
Luminosity6,250 - 15,800[9] L
Temperature2,200[4] (1,915 - 2,105[10] K
Other designations
CW Leo, Peanut Nebula, IRC+10216, IRAS 09452+1330, PK 221+45 1, Zel 0945+135, RAFGL 1381, 2MASS J09475740+1316435, SCM 50[11]
Database references

IRC +10216, also known as, CW Leonis is the most famous carbon star. Despite being a naked eye star, CW Leonis was first discovered in 1969 by a team of astronomers led by Eric Becklin, based upon infrared observations made with the 62 inch Caltech Infrared Telescope at Mount Wilson. The star's energy is emitted mostly at infrared wavelengths. At a wavelength of 5 μm, CW Leonis has the highest flux of any object outside the Solar System.[12]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog: II/246 2246. Bibcode 2003yCat.2246....0C.
  2. 2.0 2.1 Samus, N. N.Expression error: Unrecognized word "etal". (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode 2009yCat....102025S.
  3. Cohen, M. (1979). "Circumstellar envelopes and the evolution of carbon stars". Monthly Notices of the Royal Astronomical Society 186 (4): 837. Bibcode 1979MNRAS.186..837C. doi:10.1093/mnras/186.4.837.
  4. 4.0 4.1 4.2 Matthews, L. D.; Gérard, E.; Le Bertre, T. (2015). "Discovery of a shell of neutral atomic hydrogen surrounding the carbon star IRC+10216". Monthly Notices of the Royal Astronomical Society 449: 220. arXiv:1502.02050. Bibcode 2015MNRAS.449..220M. doi:10.1093/mnras/stv263.
  5. Sozzetti, A.; Smart, R. L.; Drimmel, R.; Giacobbe, P.; Lattanzi, M. G. (2017). "Evidence for orbital motion of CW Leonis from ground-based astrometry". Monthly Notices of the Royal Astronomical Society: Letters 471: L1. arXiv:1706.04391. Bibcode 2017MNRAS.471L...1S. doi:10.1093/mnrasl/slx082.
  6. A. B. Men'shchikov1; Y. Balega; T. Blöcker; R. Osterbart; G.Weigelt (2001). "Structure and physical properties of the rapidly evolving dusty envelope of IRC +10 216 reconstructed by detailed two-dimensional radiative transfer modeling". Astronomy and Astrophysics. arXiv:astro-ph/0206410. Bibcode 2002A&A...392..921M. doi:10.1051/0004-6361:20020954.
  7. Weigelt, G. et al. (May 1998), "76mas speckle-masking interferometry of IRC+10216 with the SAO 6m telescope: Evidence for a clumpy shell structure", Astronomy and Astrophysics 333: L51–L54, arXiv:astro-ph/9805022, Bibcode 1998A&A...333L..51W
  8. De Beck, E.; Decin, L.; De Koter, A.; Justtanont, K.; Verhoelst, T.; Kemper, F.; Menten, K. M. (2010). "Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles. II. CO line survey of evolved stars: derivation of mass-loss rate formulae". Astronomy and Astrophysics 523: A18. arXiv:1008.1083. Bibcode 2010A&A...523A..18D. doi:10.1051/0004-6361/200913771. A18.
  9. De Beck, E. et al. (January 10, 2012), "On the physical structure of IRC+10216", Astronomy & Astrophysics 539: A108, arXiv:1201.1850, Bibcode 2012A&A...539A.108D, doi:10.1051/0004-6361/201117635
  10. Bergeat, J.; Knapik, A.; Rutily, B. (2001). "The effective temperatures of carbon-rich stars". Astronomy and Astrophysics 369: 178. Bibcode 2001A&A...369..178B. doi:10.1051/0004-6361:20010106.
  11. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  12. Becklin, E. E. (December 1969). "The Unusual Infrared Object IRC+10216". Astrophysical Journal 158: L133. Bibcode 1969ApJ...158L.133B. doi:10.1086/180450.

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