Stellar wind

A stellar wind is a flow of gas ejected from the upper atmosphere of a star. It is distinguished from the bipolar outflows characteristic of young stars by being less collimated, although stellar winds are not generally spherically symmetric.

Different types of stars have different types of stellar winds.

Post-main-sequence stars nearing the ends of their lives often eject large quantities of mass in massive ( \scriptstyle \dot{M} > 10^{-3} solar masses per year), slow (v = 10 km/s) winds. These include red giants and supergiants, and asymptotic giant branch stars. These winds are understood to be driven by radiation pressure on dust condensing in the upper atmosphere of the stars.

Massive stars of types O and B have stellar winds with lower mass loss rates (\scriptstyle \dot{M} < 10^{-6} solar masses per year) but very high velocities (v > 1–2000 km/s). Such winds are driven by radiation pressure on the resonance absorption lines of heavy elements such as carbon and nitrogen. These high-energy stellar winds blow stellar wind bubbles.

Latest News for: Stellar wind

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LHAASO discovers giant ultra-high-energy gamma-ray bubble, identifying the first super PeVatron

Phys Dot Org 22 Feb 2024
... of the stars, forming dynamic stellar winds with speeds up to thousands of kilometers per second. The collision of stellar winds with the surrounding interstellar medium and the violent collision between stellar winds have created ideal sites for efficient particle acceleration....
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Powerful Jets From a Black Hole are Spawning Star Clusters

Universe Today 22 Feb 2024
This Hubble Space Telescope image from 2014 shows two galaxies (yellow, center) from the cluster SDSS J1531 found to be merging into one and a “chain” of young stellar super-clusters are seen winding around the galaxies’ nuclei....
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Possible atmospheric destruction of a potentially habitable exoplanet

Phys Dot Org 21 Feb 2024
Until now, planetary scientists have thought that a habitable planet needs a strong magnetic field surrounding it to act as a shield, directing ionized particles, X-rays and ultraviolet radiation in the stellar wind around and away from its atmosphere....
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Golf betting tips: Ben Coley's preview and best bets for the NMB Championship

Sporting Life 20 Feb 2024
The forecast this week promises strong winds from Friday onwards ... The hope is his stellar short-game is of elevated value with the wind up and he certainly has shown promise under these conditions, with 10th in Australia and 11th in Mauritius little more than a year ago....
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MLB Draft prospects 2024: Ranking top 10 college baseball players from J.J. Wetherholt to Jac Caglianone

Sportingnews 16 Feb 2024
Kurtz combines thundering powering (24 home runs and a .784 slugging percentage) with a stellar approach (63-to-50 walk-to-strikeout ratio) ... But the former Tennessee pitcher regressed after a stellar freshman year to struggle a bit more as a sophomore in 2023 and ultimately wind up in the Volunteers' bullpen....
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Sneak Peek at Super Bowl Soulful Celebration Rehearsals

The Tennessee Tribune 14 Feb 2024
When it was time for the music, Super Bowl Soulful Celebration featured performances by a stellar lineup of artists, that included Earth, Wind & Fire, T-Pain, Rachel Platten, Mickey Guyton, Kirk Franklin, Mary Mary, Robin Thicke, The ......
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Lunar science is entering a new active phase

Phys Dot Org 09 Feb 2024
On the moon's surface, solar wind directly strikes the lunar surface and creates a charged gas, called a plasma ... This doesn't happen on Earth because the magnetic field deflects the solar wind ... Magnetic fields are important for life because they shield the planet's surface from the solar/stellar wind....
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Massive stars and stellar winds topics of free Feb. 28 lecture at Hazleton (Penn State Hazleton)

Public Technologies 07 Feb 2024
Massive stars are at least eight times larger than the sun, ud-Doula explained, and possess strong stellar winds driven by radiation. An increasing number of them have been confirmed to have global magnetic fields that can significantly influence the dynamics of these stellar winds, which are strongly ionized....
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Passive income: my best renewable energy fund pays a 7.2% yield and is 15% cheaper now

The Motley Fool 05 Feb 2024
Offering a 7.2% dividend yield, Greencoat UK Wind (LSE. UKW) invests in wind farms, bioenergy, solar and renewable heat infrastructure in the UK ... The fund’s latest buys include Scottish 42 MW wind farm Dalquhandy ... And in the three years since I bought shares, Greencoat UK Wind’s performance has been stellar....
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Lunar science is entering a new active phase, with commercial launches of landers that will ...

Maryville Daily Forum 05 Feb 2024
On the Moon’s surface, solar wind directly strikes the lunar surface and creates a charged gas, called a plasma ... This doesn’t happen on Earth because the magnetic field deflects the solar wind ... Magnetic fields are important for life because they shield the planet’s surface from the solar/stellar wind....
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Lunar science is entering a new active phase, with commercial launches of landers

Raw Story 05 Feb 2024
On the Moon’s surface, solar wind directly strikes the lunar surface and creates a charged gas, called a plasma ... This doesn’t happen on Earth because the magnetic field deflects the solar wind ... Magnetic fields are important for life because they shield the planet’s surface from the solar/stellar wind....
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Daily Telescope: A Wolf-Rayet star puts on a howling light show

Ars Technica 03 Feb 2024
Discovered more than 230 years ago by William Herschel, astronomers believe the Crescent Nebula is formed by the combination of an energetic stellar wind from a Wolf-Rayet star at its ......
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