For hypergiant stars, the end is violent

Betelgeuse is one of those stars that astronomers call hypergiants. And a few months ago, they thought they were in the front row of their end of life. Lack. So they headed for another hypergiant star, “a Betelgeuse on steroids”to try to unravel the mysteries of the death of these stellar clocks.

Remember. It was late 2019, early 2020. Betelgeuse, one of the brightest stars of our sky, had dramatically lost its brightnesswithout him astronomers understand why. Once they thought we were about to witness the death of thesupergiant star. At the beginning of its supernova explosion. But it was not. Betelgeuse has finally regained its brilliance.

And the stars the supergiants have continued to keep part of the secret, which researchers from the University of Arizona (United States) hope to reveal thanks to a three-dimensional image of a hypergiant star. An image that reveals the processes that accompany the death of these extraordinary objects.

Of the hypergiant stars, there are only a few. Only a few in the vastness of our Milky Way. Betelgeuse is one of them. VY Canis Major (VY CMa) is another. As its name suggests, it is located in the Ensemble de petits satellites…” data-url=”” data-more=”Lire la suite”>constellation of the great Chinesejust over 3,000 Light years of our Earth. Its diameter is 10 to 15,000 times the Earth-Sun distance. It could be the most massive star in the Depuis la Terre, on ne peut observer qu’une coupe transversale…” data-image=”” data-url=”” data-more=”Lire la suite”>Milky Way. “Like a Betelgeuse under La structure de base des stéroïdes consiste en un alcool polycyclique…” data-image=”” data-url=”” data-more=”Lire la suite”>steroids»comments Lucy Ziurys, researcher, in a university of arizona statement.

Is there no supernova for hypergiant stars?

It is these extraordinary features that have led astronomers to investigate the case of VY Canis Major. In order to check if these stellar monsters really evolve into supernovae. “If that were the case, we should see a lot more supernovae in the sky.”says Lucy Ziurys. That is why the researchers think that at least some of them could quietly collapse in black holes.

Unlike less massive stars, hypergiant stars tend to lose dough substantial and sporadic that form complex and highly irregular structures. Types of bows, tufts or knots. To learn a bit more about VY CMa and how it loses mass, this has been confirmed by observations of the hubble space telescope in particular-, the astronomers traced, thanks to the data of the Large array of millimeter/submillimeter antennas of Atacama (Chile), certain La liaison dite covalente simple…” data-image=”” data-url=”” data-more=”Lire la suite”>molecules – carbon dioxide Généralités
Symbole : SNuméro atomique : 16Électrons par niveau d’énergie : 2, 8, 6Masse atomique : 32,065 uIsotopes les plus stables : 32S…” data-image=”” data-url=”” data-more=”Lire la suite”>sulfur
(SOtwo), the oxide of Généralités
Symbole : SiNuméro atomique : 14Électrons par niveau d’énergie : 2, 8, 4Masse atomique : 28,0855 uIsotopes les plus stables : 28Si stable avec 14…” data-image=”” data-url=”” data-more=”Lire la suite”>silicon
(SiO) or chloride sodium (NaCl) – ejected from the surface of the star. By moving Alma’s antennae, they were even able to obtain very detailed information about directions and La vitesse ayant une direction et une intensité est représentée par un vecteur, le vecteur vitesse. La vitesse relative est la vitesse d’un corps par rapport à un autre ou par rapport à un repère.” data-image=”” data-url=”” data-more=”Lire la définition”>gears movement of these molecules.

The researchers then superimposed everything on pre-existing images of the dust surrounding VY Canis Major. And what they observed was not a symmetric loss of mass, but cells of convection. Like giant balls thrown in different directions. “A bit like the coronal arches we see in our Le Soleil est l’étoile la plus proche de la Terre, dont elle est distante d’environ 150 millions de kilomètres. Le Soleil est situé à 8,5 kparsecs du centre de la Voie lactée. Dans la classification des étoiles, le soleil est une étoile de type G2.
La masse…” data-image=”” data-url=”” data-more=”Lire la suite”>Sun
. But a billion times bigger”
concludes Lucy Ziurys.

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