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


Did you know? Stars too have their 'mid-life crisis'Middle-aged stars experience their own kind of crisis

Deccan Herald 28 Jul 2021
a steady stream of charged particles, known as the solar wind, escapes from the star over time, carrying away small amounts of the star’s angular momentum ... A middle-aged star like the Sun can often switch to the low activity mode resulting in drastically reduced angular momentum losses by magnetized stellar winds....

Middle-aged stars experience ‘midlife crisis’ when their rotation rate slows down, says study

The Independent 28 Jul 2021
This slow down in rotation, caused by the escape of a steady stream of charged particles called stellar winds, also leads to altered magnetic fields and less stellar activity including ......

IISER scientists' study peeks into Sun's ' stellar midlife crisis '

The Telegraph India 28 Jul 2021
Calcutta scientists have proposed an explanation for a mysterious phenomenon called the stellar midlife crisis under which the Sun and many other stars display abrupt, dramatic declines in their output of high energy particles and radiation ... The Sun and other stars constantly spew electrically-charged particles also called the stellar wind....

‘Mysterious midlife crisis’: Experts decode why stars switch to low activity state in middle age

Indian Express 28 Jul 2021
We believe we have provided a solution to stellar midlife crisis,” Dr Nandi said ... A middle-aged star like the sun can often switch to low activity mode resulting in drastically reduced angular momentum losses by magnetised stellar winds....

New research: Stars can experience their own kind of midlife crisis

Indian Express 28 Jul 2021
The number of stellar activities – sunspots, flares, outbursts – also reduce ... A middle-aged star like the Sun can often switch to the low activity mode resulting in drastically reduced angular momentum losses by magnetised stellar winds.”....

10 Colorado state parks great for hikers, bikers, climbers and birders

Denver Post 27 Jul 2021
wind ... Kayakers and canoers are enamored with the reservoir for its clear water, sheltered coves and uncrowded conditions, as well as the stellar mountain views. Because of the cool water temperatures (even in summer) as well as sudden winds and large waves, especially in the afternoon, it’s best to wear a life jacket at all times....

When the Sun Dies, Earth’s Magnetosphere won’t Provide Protection any More

Universe Today 26 Jul 2021
During its red giant phase, the sun will also create a powerful, fluctuating solar wind. Usually our magnetic field is able to stop the particles of the solar wind from stripping away Earth’s atmosphere ... RASPlanetary Shields Will Buckle Under Stellar Winds From Their Dying Stars....

Maryland Weather: Marginal Risk for Severe Storms Sunday

CBS Sports 24 Jul 2021
BALTIMORE (WJZ) — After a stellar start to the weekend, a warm front will pass through the region tonight, shifting our wind direction and re-introducing heat and higher dew points back into the region....

Look up

The Daily Journal - San Mateo 24 Jul 2021
If you recall, before the full moon, we started to explore the Draco constellation. It lies between the Little and Big dippers ... It is just over 154 light years away ... As a result of a strong stellar wind, it is losing about 20 trillion tons of mass per second and is currently believed to be only slightly more massive than our sun ... ....

Planetary shields will buckle under stellar winds from their dying stars

SpaceDaily 22 Jul 2021
... the intense and furious stellar winds that will batter a planet as its star is dying....

NASA’s Webb to Explore a Neighboring, Dusty Planetary System

Technology Org 22 Jul 2021
Researchers will use NASA’s upcoming James Webb Space Telescope to study Beta Pictoris, an intriguing young planetary system that sports at least two planets, a jumble of smaller, rocky bodies, and a dusty disk ... This is the visible-light view of the system ... Credits ... Steady pressure from the starlight and stellar winds also blow out the dust ... Credits....

If There’s Life Around A White Dwarf, It Evolved After The Star Died

IFL Science 21 Jul 2021
The work showed that as a red giant ages, its stellar winds are capable of stripping nearby planets of their atmospheres ... If this wasn’t enough, the orbits of planets and habitable zones are shifted during such a stellar phase ... a more powerful solar wind and changes to our star....

Denver judge questions facts in dismissed election lawsuit involving Dominion, Facebook

Colorado Politics 17 Jul 2021
Stan Garnett, the former Boulder County District Attorney who is representing Dominion, said the case is based on "nonsense from the internet," and that the lawyers didn't research the facts because their alleged facts don't hold up to any scrutiny, yet damage a good Colorado company with 250 employees and a stellar reputation....