Origin of The Rings
The two stars observed close to SNR1987A have bracelets of pearls and outside weaker radii. This figure, similar to images provided by multimode lasers, are called "daisy modes". A common explanation: The very hot stars are in a cloud of hydrogen which, heated, generate a Strömgren sphere made up of fully ionized hydrogen (protons+electrons). Strömgren showed that outside is a plasma shell containing atoms which radiate strongly the lines of hydrogen. A superradiant emission and a competition of the modes explain the generation of the pearl bracelets. Many authors showed that the rings of SNR1987A coincide with the rim of a structure having the shape of an hourglass. The hourglass may be a Strömgren shell distorted by the inhomogeneity of the gas or of the radiation of the star. The brightness of the rings and the disappearance of the star resulted from a multiphotonic, scattering of light emitted by the star, induced by the superradiant rays: it explains that the star disappeared when the rings light up.
Read more about this topic: SN 1987A
Famous quotes containing the words origin of the, origin of, origin and/or rings:
“The real, then, is that which, sooner or later, information and reasoning would finally result in, and which is therefore independent of the vagaries of me and you. Thus, the very origin of the conception of reality shows that this conception essentially involves the notion of a COMMUNITY, without definite limits, and capable of a definite increase of knowledge.”
—Charles Sanders Peirce (1839–1914)
“For, though the origin of most of our words is forgotten, each word was at first a stroke of genius, and obtained currency, because for the moment it symbolized the world to the first speaker and to the hearer. The etymologist finds the deadest word to have been once a brilliant picture.”
—Ralph Waldo Emerson (1803–1882)
“Good resolutions are useless attempts to interfere with scientific laws. Their origin is pure vanity. Their result is absolutely nil. They give us, now and then, some of those luxurious sterile emotions that have a certain charm for the weak.... They are simply cheques that men draw on a bank where they have no account.”
—Oscar Wilde (1854–1900)
“Ye say they all have passed away,
That noble race and brave;
That their light canoes have vanished
From off the crested wave;
That, mid the forests where they roamed,
There rings no hunters’ shout;
But their name is on your waters,
Ye may not wash it out.”
—Lydia Huntley Sigourney (1791–1865)