R136

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Open cluster
R136
Star cluster R 136, photographed by the Hubble Space Telescope
Star cluster R 136, photographed by the Hubble Space Telescope
AladinLite
Constellation Swordfish
Position
equinox : J2000.0
Right ascension 05 h 38 m 42.396 s
declination -69 ° 06 ′ 03.36 ″
Appearance
Physical data

Affiliation Tarantula nebula
distance  157,000 ly
(48,500 pc )
Dimensions 90,000 M
Age 1.5 million years
history
Catalog names
 RMC 136, UCAC2 1803442, SAO 249329, HD 38268, TYC 9163-1014-1, CD-69 324, GC 7114

R136 (more precisely also RMC 136 as an acronym for Radcliffe Observatory Magellanic Clouds catalog) is a super star cluster , a large open star cluster that is located in the middle of the Tarantula Nebula in the Large Magellanic Cloud . The star cluster is about 1–2 million years old. R136 consists of young, massive stars whose hard radiation makes the nebula glow and gives it a specific, filamentous appearance. Numerous young stars, also of the Wolf-Rayet star type , belong to the spectral class O3; 39 of these have been confirmed so far. Today (2014) the star cluster is subdivided into the partial cluster R136a and the Wolf-Rayet star R136b.

R136a

R136a was first traded as a supermassive star of around 2,000 solar masses, then estimated at 750 solar masses. The assumption made in the work mentioned last that R136a is an extremely dense cluster of several stars was confirmed by speckle observations and later with images from the Hubble space telescope . R136a has therefore been further resolved, for example in R136a1 and R136a2 (1984) and R136a5 (1998). The current status (2014) shows the stars R136a1 to R136a24.
The blue hypergiant R136a1 is one of the most massive stars currently known. R136a1 is in the photo on the right in the light center of R136.

R136b

R136b (other names: HD 36402 or BAT99-38) is a Wolf-Rayet star as a member of a multiple system that is surrounded by a very hot dust nebula.

Web links

Individual evidence

  1. ^ E. Høg, C. Fabricius, VV Makarov, S. Urban, T. Corbin, G. Wycoff, U. Bastian, P. Schwekendiek, A. Wicenec: The Tycho-2 catalog of the 2.5 million brightest stars . In: Astronomy and Astrophysics . 355, 2000, p. L27. bibcode : 2000A & A ... 355L..27H .
  2. a b Paul A. Crowther, SM Caballero-Nieves, KA Bostroem, J. Maíz Apellániz, FRN Schneider, NR Walborn, CR Angus, I. Brott, A. Bonanos, A. De Koter, SE De Mink, CJ Evans, G. Gräfener, A. Herrero, ID Howarth: The R136 star cluster dissected with Hubble Space Telescope / STIS. I. Far-ultraviolet spectroscopic census and the origin of He II λ 1640 in young star clusters . In: Monthly Notices of the Royal Astronomical Society . 458, 2016, p. 624. arxiv : 1603.04994 . bibcode : 2016MNRAS.458..624C . doi : 10.1093 / mnras / stw273 .
  3. ^ Simbad data for RMC 136
  4. ^ MW Feast, AD Thackeray, AJ Wesselink: The brightest stars in the Magellanic Clouds . In: Monthly Notices of the Royal Astronomical Society . 121, No. 4, 1960, p. 337. bibcode : 1960MNRAS.121..337F . doi : 10.1093 / mnras / 121.4.337 .
  5. ^ Paul A. Crowther, SM Caballero-Nieves, KA Bostroem, J. Maíz Apellániz, FRN Schneider: 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 . In: Monthly Notices of the Royal Astronomical Society . tape 458 , no. 1 , May 1, 2016, ISSN  0035-8711 , p. 624-659 , doi : 10.1093 / mnras / stw273 ( oxfordjournals.org [accessed August 4, 2016]).
  6. Massey, P; Hunter, D .: Star Formation in R136: A Cluster of O3 Stars Revealed by Hubble Space Telescope Spectroscopy . In: The Astrophysical Journal . 493, No. 1, January 1998, p. 180. bibcode : 1998ApJ ... 493..180M . doi : 10.1086 / 306503 .
  7. ^ MW Feast, AD Thackeray, AJ Wesselink: The Brightest Stars in the Magellanic Clouds . In: Monthly Notices of the Royal Astronomical Society . tape 121 , no. 4 , October 1, 1960, ISSN  0035-8711 , p. 337–385 , doi : 10.1093 / mnras / 121.4.337 ( oxfordjournals.org [accessed August 4, 2016]).
  8. Feitzinger et al. (1980). A&A, 84, 50.
  9. Chu et al. (1984)
  10. ^ Weigelt & Baier 1985, Neri & Grewing 1988
  11. Weigelt et al. 1991
  12. SIMBAD data for R136 (search criterion: RMC 136)
  13. PM Williams: Heated dust around the LMC Wolf-Rayet system HD 36402 (BAT99-38) . In: Bulletin de la Société Royale des Sciences de Liège . 80, 2011, pp. 195-198.