Massive star formation via torus accretion: the effect of photoionization feedback
| Autor: | Eric Keto, Nina S. Sartorio, Bert Vandenbroucke, Kenneth Wood, Diego Falceta-Gonçalves |
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| Rok vydání: | 2019 |
| Předmět: |
Monte Carlo method
FOS: Physical sciences Photoionization Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences 0103 physical sciences MEIO INTERESTELAR Radiative transfer Astrophysics::Solar and Stellar Astrophysics Critical radius 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics Star formation Astronomy and Astrophysics Torus Astrophysics - Astrophysics of Galaxies Accretion (astrophysics) Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | The formation of massive stars is a long standing problem. Although a number of theories of massive star formation exist, ideas appear to converge to a disk-mediated accretion scenario. Here we present radiative hydrodynamic simulations of a star accreting mass via a disk embedded in a torus. We use a Monte Carlo based radiation hydrodynamics code to investigate the impact that ionizing radiation has on the torus. Ionized regions in the torus midplane are found to be either gravitationally trapped or in pressure driven expansion depending on whether or not the size of the ionized region exceeds a critical radius. Trapped Hii regions in the torus plane allow accretion to progress, while expanding Hii regions disrupt the accretion torus preventing the central star from aggregating more mass, thereby setting the star's final mass. We obtain constraints for the luminosities and torus densities that lead to both scenarios. 15 pages, 15 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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