CW Leonis
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Artist's impression of CW Leonis
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The second brightest extrasolar object in the sky at an infrared wavelength of 10 microns, after Eta Carinae; in addition to its variable star designation, it is catalogued as the infrared source (IRC 10°216). Visually, an 18th magnitude long-period pulsating variable, CW Leo is an asymptotic giant branch (AGB) star that lies about 650 light-years away in the constellation Leo. A luminous giant star, with a surface temperature of 2,330 K and a radius of about 500 Rsun, it is cocooned within a shell of gas and dust in which carbon and dozens of different types of molecules have been detected. This shell has been formed from material lost in the form of a stellar wind that is blowing at a speed of about 14.5 km/s and carrying away about 3 × 10-5 Msun per year. CW Leo is believed to be a rare case of a protoplanetary nebula – a system in the early stages of evolving to the planetary nebula stage.
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