R136

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R136
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In ultraviolet, visible, and red light by Hubble Space Telescope Wide Field Camera 3
Credit: NASA, ESA
Observation data (J2000.0 epoch)
Right ascensionTemplate:RA[1]
DeclinationTemplate:DEC[1]
Distance157 kly (48.5 kpc)
Apparent magnitude (V)9.50
Physical characteristics
Mass90,000[2] M☉
Estimated age1.5+0.3
−0.7 million years[2]
Other designationsUCAC2 1803442, SAO 249329, HD 38268, TYC 9163-1014-1, CD-69 324, GC 7114[3]
Associations
ConstellationDorado
See also: Open cluster, List of open clusters

R136 (formerly known as RMC 136 from the Radcliffe Observatory Magellanic Clouds catalogue[4]) is the central concentration of stars in the NGC 2070 star cluster, which lies at the centre of the Tarantula Nebula in the Large Magellanic Cloud. When originally named it was an unresolved stellar object (catalogued as HD 38268 and Wolf–Rayet star Brey 82) but is now known to include 72 class O and Wolf–Rayet stars within 5 parsecs (20 arc seconds) of the centre of the cluster.[5] The extreme number and concentration of young massive stars in this part of the LMC qualifies it as a starburst region.[6]

Properties

R136 produces most of the energy that makes the Tarantula Nebula visible. The estimated mass of the cluster is 450,000 solar masses, suggesting it may become a globular cluster in the future.[7] R136 has around 200 times the stellar density of a typical OB association such as Cygnus OB2.[8] The central R136 concentration of the cluster is about 2 parsecs across, although the whole NGC 2070 cluster is much larger.[8]

R136 is thought to be less than 2 million years old.[8][9] None of the member stars are significantly evolved, and none are thought to have exploded as supernova. Because of this, the cluster contains no red supergiants, blue hypergiants, or luminous blue variables. The brightest stars are WNh, O supergiants, and OIf/WN slash stars, all extremely massive fully convective stars. A small number of B-type main sequence stars have been detected in the outskirts of the cluster, but less massive and less luminous stars cannot be resolved from the dense cluster core at the large distance of the LMC.[5]

R136a

R136a is the bright knot at the centre of R136. It consists of eight extremely massive stars, three of them Wolf–Rayet stars and the rest early O-class stars.[2]

Components

The cluster contains many of the most massive and luminous stars known, including R136a1. Within the central 5 parsecs there are 32 of the hottest type O stars (O2.0–3.5), 40 other O stars, and 12 Wolf–Rayet stars, mostly of the extremely luminous WNh type. Within 150 parsecs there are a further 325 O stars and 19 Wolf–Rayet stars.[5] Several runaway stars have been associated with R136, including VFTS 682.[10] R136 was first resolved into three components R136a, R136b, and R136c. R136a was resolved using speckle interferometry and eventually space-based observations into as many as 24 components,[11] dominated by R136a1, R136a2, and R136a3, all three being extremely massive WNh stars several million times more luminous than the sun.[12]

Basic data for the original RMC 136 a, b, and c stars
Name Right ascension[12] Declination[12] V[2] (F555W) Spectral type[12] MV[13] (F555W) Temperature (K)[12] Luminosity (L☉)[12]Template:R/superscript Mass (M☉)[12]Template:R/superscript
R136a1 Template:RA Template:DEC 12.28 WN5h −8.18 46,000 7,244,000 291[14]
R136a2 Template:RA Template:DEC 12.80 WN5h −7.80 47,000 5,129,000 195
R136a3 Template:RA Template:DEC 12.97 WN5h −7.52 50,000 5,012,000 184
R136a4 Template:RA Template:DEC 13.96 O3 V((f*))(n) −6.68 50,000 1,905,000 108
R136a5 Template:RA Template:DEC 13.71 O2I(n)f* −6.86 48,000 2,089,000 116
R136a6 Template:RA Template:DEC 13.35 O2I(n)f*p −6.46 52,000 1,738,000 105
R136a7 Template:RA Template:DEC 13.97 O3III(f*) −6.59 54,000 2,291,000 127
R136a8 Template:RA Template:DEC 14.42 O2–3V[2] −6.05[2] 49,500 1,479,000 96
R136b Template:RA Template:DEC 13.24 O4If −7.70 35,500 2,239,000 92
R136c Template:RA[15] Template:DEC[15] 12.86 WN5h[16] −7.9[5] 42,170[16] 3,802,000[16] 142[16]
  • R136 observed with Hubble's WFC3[17]
    R136 observed with Hubble's WFC3[17]
  • Runaway star speeding from 30 Doradus in an image taken by the Hubble Space Telescope
    Runaway star speeding from 30 Doradus in an image taken by the Hubble Space Telescope
  • R136 in infrared (Hubble Space Telescope)
    R136 in infrared (Hubble Space Telescope)

See also

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References

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  2. ^ a b c d e f Page Module:Citation/CS1/styles.css has no content.Crowther, Paul A.; Caballero-Nieves, S. M.; Bostroem, K. A.; Maíz Apellániz, J.; Schneider, F. R. N.; Walborn, N. R.; Angus, C. R.; Brott, I.; Bonanos, A.; De Koter, A.; De Mink, S. E.; Evans, C. J.; Gräfener, G.; Herrero, A.; Howarth, I. D.; Langer, N.; Lennon, D. J.; Puls, J.; Sana, H.; Vink, J. S. (2016). "The R136 star cluster dissected with Hubble Space Telescope/STIS. I. Far-ultraviolet spectroscopic census and the origin of He II λ1640 in young star clusters". Monthly Notices of the Royal Astronomical Society. 458 (1): 624–659. arXiv:1603.04994. Bibcode:2016MNRAS.458..624C. doi:10.1093/mnras/stw273.
  3. ^ Page Module:Citation/CS1/styles.css has no content."RMC 136". SIMBAD. Centre de données astronomiques de Strasbourg. {{cite web}}: Invalid |mode=Script error: No such module "Citation mode". (help)
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  8. ^ a b c Page Module:Citation/CS1/styles.css has no content.Massey, P.; Hunter, D. A. (1998). "Star Formation in R136: A Cluster of O3 Stars Revealed by Hubble Space Telescope Spectroscopy". The Astrophysical Journal. 493 (1): 180. Bibcode:1998ApJ...493..180M. doi:10.1086/305126.
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  10. ^ Page Module:Citation/CS1/styles.css has no content.Banerjee, S.; Kroupa, P.; Oh, S. (2012). "Runaway massive stars from R136: Vfts 682 is very likely a "slow runaway"". The Astrophysical Journal. 746 (1): 15. arXiv:1111.0291. Bibcode:2012ApJ...746...15B. doi:10.1088/0004-637X/746/1/15. S2CID 117959362.
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  16. ^ a b c d Page Module:Citation/CS1/styles.css has no content.Schneider, F. R. N.; Sana, H.; Evans, C. J.; Bestenlehner, J. M.; Castro, N.; Fossati, L.; Gräfener, G.; Langer, N.; Ramírez-Agudelo, O. H.; Sabín-Sanjulián, C.; Simón-Díaz, S.; Tramper, F.; Crowther, P. A.; de Koter, A.; de Mink, S. E.; Dufton, P. L.; Garcia, M.; Gieles, M.; Hénault-Brunet, V.; Herrero, A.; Izzard, R. G.; Kalari, V.; Lennon, D. J.; Maíz Apellániz, J.; Markova, N.; Najarro, F.; Podsiadlowski, Ph.; Puls, J.; Taylor, W. D.; van Loon, J. Th.; Vink, J. S.; Norman, C. (2018). "An excess of massive stars in the local 30 Doradus starburst". Science. 359 (6371): 69–71. arXiv:1801.03107. Bibcode:2018Sci...359...69S. doi:10.1126/science.aan0106. PMID 29302009. S2CID 206658504.
  17. ^ Page Module:Citation/CS1/styles.css has no content.NASA; ESA; Crowther, P. (17 March 2016). "R136 observed with WFC3". ESA/Hubble. Retrieved 23 March 2016.

Further reading

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