Stellar wind accretion and accretion disk formation: Applications to neutron star high-mass X-ray binaries

PASJ: Publications of the Astronomical Society of Japan

Nakamura, Kenji¹  Karino, Shigeyuki²  Taani, Ali³ 

[1] Department of Mechanical Engineering, Kyushu Sangyo University, 2-3-1 Matsukadai, Higashi-ku, Fukuoka, Fukuoka 813-8503, Japan;Faculty of Science and Engineering, Kyushu Sangyo University, 2-3-1 Matsukadai, Higashi-ku, Fukuoka, Fukuoka 813-8503, Japan;Physics Department, Faculty of Science, Al-Balqa Applied University, 19117 Salt, Jordan

关键词: X-rays: binaries;    X-rays: individual;    stars: neutron;    accretion, accretion disks;   

DOI  :  10.1093/pasj/psz034

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Recent X-ray observations have revealed the complexity and diversity of high-mass X-ray binaries (HMXBs). This diversity challenges a classical understanding of the accretion process on to the compact objects. In this study, we reinforce the conventional concept of the nature of wind-fed accretion on to a neutron star considering the geometrical effect of radiatively accelerated wind, and re-evaluate the transported angular momentum by using a simple wind model. Our results suggest that even in an OB-type HMXB fed by stellar wind, a large amount of angular momentum could be transported to form an accretion disk due to the wind-inhomogeneity, if the binary separation is tight enough and/or the stellar wind is slow. We apply our model to actual systems such as LMC X-4 and OAO 1657−415, and discuss the possibility of disk formations in these systems.

【 授权许可】

CC BY