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Evolution of Circumstellar Medium in NGC 7635: A Study on Massive Stars

Explore the evolution of the circumstellar medium around massive stars in NGC 7635 (Bubble Nebula) using hydrodynamical simulations and stellar wind models. Investigate the pre-supernova stages, mass loss, and photoionization processes in the H II region.

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Evolution of Circumstellar Medium in NGC 7635: A Study on Massive Stars

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  1. Sabina-Mădălina Chiţă , Norbert Langer, Allard-Jan van Marle Sterrenkundig Instituut Universiteit Utrecht Evolution of the circumstellar medium around massive stars

  2. NGC 7635 (The Bubble Nebula) • stellar wind bubble • H II region (photoionized) • 3 pc wide

  3. H-R diagram for 12 M⊙ star • Presupernova stage : • MS-> RSG-> BSG-> RSG • data credit :A.Heger, Los Alamos

  4. Stellar wind mass-loss history • RSG-> BSG-> RSG • mass loss • velocity • photoionization

  5. ZEUS -3D code • hydrodynamicalcode: credit Stone & Norman (1992) • solvesthe Euler equations on a fixed grid • photoionization: credit García-Segura (1999) • rotation: wind compressed disk model: credit Cassinelli & Bjorkman (1992)

  6. 1D simulation of MS • end of MS stage • photoionized region • hot bubble • MS shell

  7. 1D simulation of RSG • MS -> RSG • old MS shell • new MS shell(hot bubble shell) • no photo-ionization • RSG shell

  8. 2D simulation of RSG-> BSG-> RSG

  9. 2D simulation of pre-supernova • final stage: pre-supernova • RSG shell

  10. 2D simulation • RSG shell • 3 pc

  11. Outlook • SN 1987 A • BSG progenitor of SN1987 A

  12. Thank you !

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