stars) which may be a brief intermediate stage between high mass main-sequence stars and hypergiants or LBVs. Neugent; Philip Massey; Brian Skiff; Georges Meynet (April 2012). The Pistol Star is possibly as much as 150 times more massive than the Sun, and is about.7 million times more luminous. Astronomy and Astrophysics Supplement Series. Unfortunately, we did not find sufficient information whether kecaincontrii is safe for children or does not look fraudulent. Almost all hypergiants exhibit variations in luminosity over time due to instabilities within their interiors, but these are small except for two distinct instability regions where luminous blue variables (LBVs) and yellow hypergiants are found. 5 As opposed to line-driven stellar winds (that is, ones driven by absorbing light from the star in huge numbers of narrow spectral lines continuum driving does not require the presence of "metallic" atoms atoms other than hydrogen and helium, which have few such lines . In the same line of reasoning, the continuum driving may also contribute to an upper mass limit even for the first generation of stars right after the Big Bang, which did not contain any metals at all. In 1956, the astronomers, feast and, thackeray used the term super-supergiant (later changed into hypergiant) for stars with an absolute magnitude brighter than, m V 7 (.
Quiescent LBVs have been observed with WNL spectra and apparent Ofpe/WNL stars have changed to show blue hypergiant spectra. "Eta Carinae and the Luminous Blue Variables". That may mean that the domain is not popular enough or well-promoted yet, but it may be still safe and promising. Some of these distinctions are not necessarily helpful in establishing relationships between different types of stars or the differences between them since they have been developed based on differing criteria and for different purposes. "On the nature of the galactic early-B hypergiants". Prototype variable, LBVs are still often called S Doradus variables. Sterken,.; de Groot,.; van Genderen,. Although most supergiant stars are less luminous than hypergiants of the same temperature, a few fall in the same luminosity range. Although these are generally thought to be the stage reached by hypergiant stars after sufficient mass loss, it is possible that a small group of hydrogen-rich WNL stars are actually progenitors of blue hypergiants or LBVs.