1806−20 cluster

Heavily obscured star cluster on the far side of the Milky Way 1806−20 cluster 1806-20 cluster.jpg H-band infrared image of 1806−20 cluster J2000 Sagittarius 18 08 39.33 -20 24 40.0 ~28000 ly ~8700 pc2018A&A...612A..11H Extended VHE γ-ray emission towards SGR1806-20, LBV 1806-20, and stellar cluster Cl* 1806-20 H. E. S. S. Collaboration Abdalla H. Abramowski A. Aharonian F. Ait Benkhali F. Akhperjanian A. G. Angüner E. O. Arrieta M. Aubert P. Backes M. Balzer A. Barnard M. Becherini Y. Becker Tjus J. Berge D. Bernhard S. Bernlöhr K. Birsin E. Blackwell R. Böttcher M. Boisson C. Bolmont J. Bordas P. Bregeon J. Brun F. Brun P. Bryan M. Bulik T. Capasso M. Carr J. Astronomy and Astrophysics 2018 612 612 10.1051/0004-6361/201628695 1606.05404 118345803 1 Contains SGR 1806−20 and LBV 1806−20. G10.0-0.3, W31 1806−20 (originally named the SGR 1806−20 cluster) is a heavily obscured star cluster on the far side of the Milky Way, approximately 28,000 light-years distant.Bibby J. Crowther P. Furness J. Clark J. 2008 A downward revision to the distance of the 1806-20 cluster and associated magnetar from Gemini Near-Infrared Spectroscopy Monthly Notices of the Royal Astronomical Society 386 1 10.1111/j.1745-3933.2008.00453.x free 0802.0815 2008MNRAS.386L..23B 14466990 Some sources claim as far as 50,000. It contains the soft gamma repeater SGR 1806−20 and the luminous blue variable hypergiant LBV 1806−20, a candidate for the most luminous star in the Milky Way. LBV 1806−20 and many of the other massive stars in the cluster are thought likely to end as supernovas in a few million years, leaving only neutron stars or black holes as remnants. The cluster is heavily obscured by intervening dust, and mostly visible in the infrared. It is part of the larger W31 H II region and giant molecular cloud. It has a compact core of ~0.2 pc in diameter with a more extended halo of ~2 pc in diameter containing the LBVSIMBAD/Aladin plot, of r=30 asec region around SGR B18054117-20251165 and at least three Wolf–Rayet stars (of types WC8, WN6, and WN7) and an OB supergiant, plus other young massive stars.astro-ph/0501560 10.1086/429159 Massive Stars in the SGR 1806-20 Cluster 2005 Figer Donald F. Najarro Francisco Geballe T. R. Blum R. D. Kudritzki Rolf P. The Astrophysical Journal 622 1 L49–L52 2005ApJ...622L..49F 14696048 See also Charles Wolf Georges Rayet References External links The Unusual High-Mass Star Cluster 1806−20 Category:Sagittarius (constellation) Category:Open clusters