HD 143183

HD 143183 is a red supergiant variable star of spectral type M3Ia in constellation Norma. It is a member of the Norma OB1 association, at a distance of about 2 kiloparsecs. It is one of the most luminous red supergiants with a luminosity about 100,000 times greater than the Sun (L☉), and is as well one of the largest stars with a radius over eight hundred times that of the Sun (R☉). It has an estimated mass loss rate of 5×10−5 M☉ per year.[6] It is surrounded by a dozen early-type stars and a circumstellar nebula which extends 0.12 parsecs (0.39 ly).

HD 143183

HD 143183 (brightest star in the image) as seen from the Rutherfurd Observatory.
Observation data
Epoch J2000      Equinox J2000
Constellation Norma
Right ascension  16h 01m 22.2226s[1]
Declination −54° 08′ 35.6066″[1]
Apparent magnitude (V) 7.3 - 8.6[2]
Characteristics
Spectral type M3 Ia[3]
U−B color index +0.75[4]
B−V color index +2.10[4]
Variable type LB[2]
Astrometry
Radial velocity (Rv)–39.67±0.66[1] km/s
Proper motion (μ) RA: –1.1[5] mas/yr
Dec.: 13.1[5] mas/yr
Parallax (π)0.5559 ± 0.1021[1] mas
Distance6,850±650[6] ly
(2,100±200[6] pc)
Absolute magnitude (MV)−7.5[7]
Details
Mass20[6] M☉
Radius832[3] R☉
Luminosity98,000 - 106,000[3], 316,000[6][8] L☉
Surface gravity (log g)–0.6[6] cgs
Temperature3,600±170[3] K
Other designations
HD 143183, CD-53 6947, IRAS 15576-5400, 2MASS J16013621-5408356
Database references
SIMBADdata

HD 143183 is catalogued with the variable star designation V558 Normae as its brightness varies irregularly between apparent magnitudes 7.3 and 8.6.[2]

It is possible that HD 143183 is a spectroscopic binary with an OB+ companion but this is considered doubtful.[6] HD 143183 lies approximately 1' from the 10th-magnitude O-class bright giant CD-53 6363, the second-brightest star in the cluster.

References
  1. 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.
  2. Samus, N. N.; Durlevich, O. V.; et al. (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: B/gcvs. Bibcode:2009yCat....102025S.
  3. Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd.
  4. Klare, G.; Neckel, T. (1977). "UBV, Hβ and polarization measurements of 1660 southern OB stars". Astronomy and Astrophysics Supplement Series. 27: 215. Bibcode:1977A&AS...27..215K.
  5. Høg, E; Fabricius, C; Makarov, V. V; Urban, S; Corbin, T; Wycoff, G; Bastian, U; Schwekendiek, P; Wicenec, A (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  6. Moffat, A. F. J. (August 1976). "Mass loss from the M 3 supergiant HD 143183 in a young compact star cluster in Norma". Astronomy and Astrophysics. 50 (3): 429–434. Bibcode:1976A&A....50..429M.
  7. Humphreys, R. M (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". The Astrophysical Journal Supplement Series. 38: 309. Bibcode:1978ApJS...38..309H. doi:10.1086/190559.
  8. Blum, R. D; Ramirez, Solange V; Sellgren, K; Olsen, K (2003). "Really Cool Stars and the Star Formation History at the Galactic Center". The Astrophysical Journal. 597 (1): 323–346. arXiv:astro-ph/0307291. Bibcode:2003ApJ...597..323B. doi:10.1086/378380.
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