Arxiu per Agost, 2017

La millor imatge de la superfície i atmosfera d’una estrella, que no sigui el Sol.

Els astrònoms de l’interferòmetre del Very Large Telescope (VLTI) de l’ESO, han construït la imatge més detallada d’una estrella: la supergegant vermella Antares. També han realitzat el primer mapa de les velocitats del material situart a l’atmosfera d’una estrella que no sigui el Sol, revelant turbulències en la gran atmosfera d’Antares.

A simple vista, la famosa i brillant Antares, brilla amb un fort color vermell, està situada en el cor de la constel·lació d’Scorpius. És una gran i comparativament estrella freda supergegant vedrmella, situada en els últims estadis de la seva vida, en el camí de convertir-se en una supernova.

El VLTI, és una instal·lació única, que permet combinar la llum de fins a quatre grans telescopis, els Telescopis Unitaris de 8,2 metres de diàmetre o els Telescopis Auxiliars, més petits, per crear un telescopi virtual equivalent a un mirall individual de fins a 200 metres de diàmetre. Això permet resoldre detalls molt més enllà del que podría observar un únic telescopi.

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Podem observar una imatge reconstruïda pels astrònoms del VLTI, a partir de les dades infraroges , les quals han permès calcular la diferència entre la velocitat del gas atmosfèric en diferents posicions de l’estrella i la velocitat mitjana sobre l’estrella globalment.

Us recomanem mireu aquest vídeo amb informació gràfica molt  detallada.

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Si voleu més informació, premeu aquest enllaç.

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