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Formation of Massive Stars Under Protostellar Radiation Feedback: Very Metal-poor Stars by Hajime Fukushima; Takashi Hosokawa; Gen Chiaki; Kazuyuki Omukai; Naoki Yoshida; Rolf Kuiper is a Physics and Astronomy article available to read on EtoBox.

What is Formation of Massive Stars Under Protostellar Radiation Feedback: Very Metal-poor Stars about?

## ABSTRACT We study the formation of very metal-poor stars under protostellar radiative feedback effect. We use cosmological simulations to identify low-mass dark matter haloes and star-forming gas clouds within them. We then follow protostar formation and the subsequent long-term mass accretion phase of over one million years using two-dimensional radiation-hydrodynamics simulations. We show that the critical physical process that sets the final mass is the formation and expansion of a bipolar H ii region. The process is similar to the formation of massive primordial stars, but radiation pressure exerted on dust grains also contributes to halting the accretion flow in the low-metallicity case. We find that the net feedback effect in the case with metallicity Z = 10−2 Z⊙ is stronger than in the case with Z ∼ 1 Z⊙. With decreasing metallicity, the radiation-pressure effect becomes weaker, but photoionization heating of the circumstellar gas is more efficient owing to the reduced dust attenuation. In the case with Z = 10−2 Z⊙, the central star grows as massive as 200 solar masses, similarly to the case of primordial star formation. We conclude that metal-poor stars with a few hundre

Who reads Formation of Massive Stars Under Protostellar Radiation Feedback: Very Metal-poor Stars?

Author

Hajime Fukushima; Takashi Hosokawa; Gen Chiaki; Kazuyuki Omukai; Naoki Yoshida; Rolf Kuiper

Publisher

John Wiley and Sons; Oxford University Press; Oxford University Press (OUP) (ISSN 0035-8711)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)