What is this mysterious star imaged by the James-Webb telescope?

Une photographie du James-Webb montrant WR 140. © Nasa, ESA

Same as him telescope hubble, the james webb (JWST) can make contributions on many issues ofastrophysics Y cosmology. They are not limited to the study of the first galaxies or to the analysis of the chemical composition of atmospheres of exoplanets. We know, for example, that the interstellar dust that makes up about 1% of cloud formation
The quantity…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/b/7/e/b7e2382b95_59611_mer-nuages-seblino-camptocamporg-cc-30.jpg” data -url=”https://news.google.com/planete/definitions/climatologie-nuage-14525/” data-more=”Read more”>clouds dense, cold molecules is a key ingredient in the formation of stars and planets. However, it turns out that the various production processes of this dust are still not as well understood as the cosmochemical and astrophysicists would like.

This is why, to see things more clearly, the study programs of double star systems known under the name of binaries Wolf-Rayet (WR) in winds in collision are already underway with the JWST. We know that the WR 140 and WR 137 systems are currently undereye of James Webb Space Telescope because they are efficient producers of dust in the The history of the universe begins about 13.7 billion years ago in an extremely dense and hot soup. The laws of physics like us…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/1/5/5/1557798396_80921_universe.jpg” data-url= “https : //news.google.com/sciences/definitions/astronomy-universe-15239/” data-more=”Read more”>Universe Current local examples and, more importantly, believed to be representative of other colliding wind binaries that probably existed in the earliest galaxies.

An image taken by the JWST of WR 140 is currently in the spotlight. It is spectacular and it is a binary system I already studied with the telescope Hubble which is around 5,600 Light years of Solar system on the Milky Way looking in the direction of the Small Satellite Array…” data-url=”https://news.google.com/sciences/definitions/universe-constellation-21/” data-more=”Read More “>constellation of the Swan.

The binary has been studied for decades. So we’ve known for a while that WR140 is a massive double star comprising a star Wolf-Rayet type WC7 and an O5 star, probably a blue supergiant. The two stars blow fast stellar winds (about 3,000 km/s) under the effect of radiation pressure produced by brightness from 103 At 104 times that of The Sun is the closest star to Earth, from which it is about 150 million kilometers away. The Sun is 8.5 kparsecs from the center of the Milky Way. In stellar classification, the sun is a G2-type star.
The mass…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/1/d/9/1d9cd1d45f_50034577_eruption.jpg” data-url=”https://news. google.com/sciences/definitions/univers-soleil-3727/” data-more=”Read more”>Sun. This translates into losses of dough significant, around 10-5 and 10-6 solar masses/year.

giant dust bubbles

The false image Sometimes the color…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/7/9/5/7951943cc1_85596_couleur.jpg” data-url= “https : //news.google.com/science/definitions/physics-color-4126/” data-more=”Read more”>colors of the JWST, because taken in the infrared, it exhibits the eight branches produced by the phenomenon of diffraction with the Mirrors of the telescope (see about this phenomenon, the cult work on the optics of Eugene Hecht). So it is an artifact, but this is not the case for the series of circular arcs surrounding the central binary in the image.

These are shells of gas which appear as rings because the edges of these layers, which are not perpendicular to the observer’s view, represent radiation from “columns” of organic matter, nitrogenous matter, etc.
There are different families like:

organic matter, which constitutes living beings (animals or plants) or…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/e/7/0/e70ccaaf4a_91935_matiere. jpg” data-url=”https://news.google.com/sciences/definitions/matiere-matiere-15841/” data-more=”Read more”>matter thickest in line of sight.

The existence of these shells is not mysterious and it is understood how they are produced periodically approximately every 7.94 years. About 20 rings are visible, and according to astrophysicists, the youngest was born in 2016. But how do they know?

This animation shows dust production in the WR 140 binary star system as the Wolf-Rayet star’s orbit approaches the O-type star and their stellar winds collide. Stronger winds from the Wolf-Rayet star blow behind the O star, forming dust in their wake as the mixed stellar material cools. As the process is repeated, the powder will form a layer. © NASA, ESA and J. Olmsted (STScI)

The determination of the orbital parameters of the stars of WR 140 shows that they are in respective orbits quite eccentricso that they approach in a consistent manner, reaching for one of them their periapsis (the shortest distance between them) approximately every 7.94 years precisely.

The collision between the stellar winds produced by the two stars is quite violent at this time, and an expanding bubble of matter is born which, as it cools, will cause the dust to condense. It is this dust that is heated by radiation ultraviolet of the two massive young stars will cool by radiating in the infrared, revealing the expanding shells to the JWST. So we can see a kind of Strata giving testimony of the past history during some 160 years of the binary.

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