stars are actually progenitors of blue hypergiants or LBVs. Many hypergiants have highly variable spectra, but they are grouped here into broad spectral classes. Bibcode : 2000A.144.379M. Notices: You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable. Ordinary supergiants lack the strong H emission and broadened spectral lines that indicate rapid mass loss in the hypergiants. Some but not all LBVs show the characteristics of hypergiant spectra at least some of the time, but many authors would exclude all LBVs from the hypergiant class and treat them separately. A good candidate for hosting a continuum-driven wind is Eta Carinae, one of the most massive stars ever observed. This "active" zone is near the hot edge of the unstable "void" where yellow hypergiants are found, with some overlap. Astrophysics and Space Science Library.
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Prototype variable, LBVs are still often called S Doradus variables. A few more stable high mass yellow supergiants with approximately the same luminosity are known and thought to be evolving towards the red supergiant phase, but these are rare as this is expected to be a rapid transition. 12 In the northern constellation of Cassiopeia, is about 500,000 times as luminous as the Sun. "Light variations of massive stars (alpha Cygni variables). No warranties are given. A new version of this license is available. "Rotating massive main-sequence stars". Attribute this work: No additional restrictions, you may not apply legal terms or that legally restrict others from doing anything the license permits. See also edit Some authors consider Cygnus OB2-12 an LBV because of its extreme luminosity, although it has not shown the characteristic variability.
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