December Talk ‘Stellar winds are blowing bubbles by Sam Green (DIAS)
December 2, 2019 @ 7:30 pm
Talk: “Stellar winds are blowing bubbles”
A stellar wind bubble is a cavity light years across filled with hot gas blown in the interstellar medium by high-velocity stellar wind from a single massive O or B type star. Weaker stellar winds also blow bubble structures, called astrospheres. The heliosphere blown by the solar wind, within all the planets of the solar system lie, is a small example of a stellar wind bubble. Several examples of these bubbles will be explored with the main focus being on the Bubble Nebula (NGC 7635). This nebula is the only known parsec-scale wind bubble that has been observed around an O star in optical wavelengths. The Hubble Space Telescope captured a beautiful image of it back in 2016 which has sparked new research into the formation of stellar wind bubbles.
Speaker: Sam Green (Dublin Institute for Advanced Studies)
Samuel Green studied physics and astrophysics at Trinity College Dublin. He completed his masters degree in space science & Technology at University College Dublin. During his MSc he did an internship (3 months) at DIAS working on hydrodynamic simulations of the Bubble Nebula, NGC 7635. In January 2017 he started his PhD entitled “Multidimensional simulations of the stellar wind from massive stars”.