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

Autor:	Karino, Shigeyuki, Nakamura, Kenji, Taani, Ali
Rok vydání:	2019
Předmět:	Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Solar and Stellar Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1093/pasj/psz034
Popis:	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 onto the compact objects. In this study, we reinforce the conventional concept of the nature of wind-fed accretion onto 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 stellar wind is slow. We apply our model into actual systems such as LMC X-4 and OAO 1657-415, and discuss the possibility of disk formations in these systems. Comment: 12 pages, 12 figures, accepted for publication in PASJ
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1903.03455 Zobrazit plný text záznamu View this record from Arxiv