stellar wind


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stellar wind

The steady stream of matter ejected from many types of stars, including the Sun (see solar wind). Although the mass loss is small in sunlike stars, it has been found to be very considerable in red giants and in hot luminous ultraviolet stars, particularly in Of stars and Wolf-Rayet stars. This large mass loss could have a substantial effect on the final evolution of the stars into either white dwarfs or into more massive neutron stars (or black holes). In hot stars the stellar winds are thought to be produced by radiation pressure of the intense ultraviolet radiation acting on the atoms in the stars' atmospheres. In red giants with hot coronae and low gravity the winds may simply be the expansion of the coronal gases into space. See also T Tauri wind.

stellar wind

[′stel·ər ′wind]
(astronomy)
The flow of ionized gas from the surface of a star into interstellar space.
References in periodicals archive ?
The presence of warm dust implies that it formed very recently, perhaps in spurts, as chemically enriched material from the two stellar winds collides at different points, mixes, flows away, and cools.
Binney: Stellar Wind was the basic reason I left the NSA in 2001.
It was already known that the stellar wind is "clumpy", but the Herschel results have shown that some regions around the star must have no wind.
Observations taken with Hubble's Cosmic Origins Spectrograph (COS) suggest powerful stellar winds are sweeping the cast-off atmospheric material behind the scorched planet and shaping it into a comet-like tail.
Normally, this much dust would block our view of the star, so the current brightening is either due to something destroying the dust, or the stellar wind not producing as much dust as it did before.
Scientists have thought a dense stellar wind fueled the outburst and considered it the prototype for "supernova impostors," or shorter-lived eruptions that don't quite destroy a star.
The radiation on the cloud creates high pressure at the surface by ablation and ram pressure from the stellar wind.
This study also revealed that the black hole in M101 ULX-1 can capture more material from that stellar wind than astronomers had anticipated.
Planetary magnetospheres are 'bubbles' made of fields and plasma created by the shock between the stellar wind and the intrinsic magnetic field of the planet.
Eta Carinae is too cool to generate X-rays, but it continuously blasts a flow of gas into space as a stellar wind at about 300 miles per second.
These are huge condensations of molecular gas--the head of each containing more mass than the Earth--embedded in the ionised nebula and driven outwards by the stellar wind from the evolving central star.
From the energy and duration of the initial X-ray release, the researchers suggest that the exploded star was compact but surrounded by a substantial stellar wind, hurled out before it went supernova.