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


'False positive:' Researchers think the mysterious radio signal that might have been a sign of ...

The Daily Mail 26 Oct 2021
The intervals appear to correspond to multiples of frequencies used by oscillators commonly used in electronic devices ... Proxima b ... The rocky world is subject to solar winds 2,000 times those experienced on Earth from the Sun. While it is within a zone where liquid water could form - these stellar winds make it unlikely life could evolve ... Advertisement....

Astronomers Discover Solar System's Lowest Carbon-Abundant Star to Date

International Business Times 20 Oct 2021
... formation occurred a few Gyr ago, the winds of carbon stars are responsible for a great deal of carbon enrichment. One cannot rule out a large contribution from zero-metallicity stars, especially early on, and from high-mass stellar winds that become stronger with metallicity....

The Most Dangerous Spyware Firm You’ve Never Heard Of

Principia Scientific 18 Oct 2021
Among those targeted political leaders, per reports, were the current leaders of France, Pakistan, South Africa, Egypt, Morocco and Iraq ... The contract was part of Operation Stellar Winds and was approved by then-NSA Director Keith Alexander, who has since been an outspoken advocate of closer Israeli-American government cooperation in cybersecurity....

The Genius of… The Argument by Fugazi 13 Oct 2021
By the time the record winds down with the title track, all muted I’m So Tired-isms until it hits a stellar phase of coiled soloing, they’ve been to five or six further spots to check out what Fugazi look like against that backdrop....

How to be 60 by Julianne Moore

The Daily Mail 10 Oct 2021
Do things that scare you (like singing), walk away from anger and binge-watch decorating shows ... On the red carpet, she exudes classic style ... ‘It’s enough!’ Julianne says ... But I, for one, am glad that Julianne Moore threw caution to the wind to become an actor instead ‒ one who occasionally pauses her stellar career to clear up dog mess at the weekend....

Stellar winds and evaporating exoplanet atmospheres

Phys Dot Org 04 Oct 2021
The effects of XUV radiation on exoplanet atmospheres have been studied for almost twenty years, but the effects of the stellar wind on exoplanet atmospheres are only poorly understood ... The simulations show that, depending on the details, the stellar wind can generate outflows from a planet's atmosphere....

Hot Wheels Unleashed Review: Nostalgic Fun Stuck in Second Gear

Coming Soon 27 Sep 2021
It’s a fun conceit for a game and it winds up ... While there are boost areas to drive over to get an increase in speed, loops to go around, and some great reflections that give the game a stellar look, the actual driving doesn’t ever wind up being all that memorable....

Justin Herbert, Chargers hold off Patrick Mahomes, Chiefs in thriller

Orange County Register 26 Sep 2021
KANSAS CITY, Mo. — The Chargers needed a defensive play after repeating their ugly fourth-quarter script from Week 2 ... Williams has a habit of making big plays in Kansas City ... Tristan Vizcaino missed the extra-point attempt while kicking into the wind ... continued his stellar rookie season by recording his second interception in as many weeks ... ....

Hubble Reveals the Final Stages of a Dying Star

Universe Today 23 Sep 2021
Astronomers believe that powerful stellar winds are shaping the filaments and bubbles of dust and gas surrounding the star, giving them their diaphanous appearance ... It was carved out long ago, by AG Carinae’s powerful stellar winds ... The stellar winds coming from the star are even faster....

A New Understanding of Galaxy Evolution with NASA’s Roman Space Telescope

Technology Org 22 Sep 2021
for example, their history of star formation, how rapidly they formed stars over time, and how each generation of stars influenced the next through supernova explosions and stellar winds ... mergers to supernova shock waves and galaxy-scale winds powered by supermassive black holes....

NASA's Hubble Just Captured the Last Violent Gasps of a Doomed Star

Interesting Engineering 21 Sep 2021
Astronomers suspect the visible dust bubbles and stretched-out filament were shaped by potent stellar winds flaring out from the star ... And the ring or halo of gas formed as a result of an interior stellar wind that cleared the center by pushing out at roughly 124 miles (200 km) per second....

A new understanding of galaxy evolution with NASA's Roman Space Telescope

Phys Dot Org 21 Sep 2021
for example, their history of star formation, how rapidly they formed stars over time, and how each generation of stars influenced the next through supernova explosions and stellar winds ... mergers to supernova shock waves and galaxy-scale winds powered by supermassive black holes....

The final, dying outbursts of an unstable star are captured by Hubble

Digital Trends 19 Sep 2021
In this image of AG Carinae, the blue demonstrates the contrasting appearance of the distribution of the dust that shines of reflected stellar light ... This dust shines brightly because it reflects the light given off by the star, and it is shaped by stellar winds which are coming from the star as well....