scholarly journals Testing models of periodically modulated FRB activity

2021 ◽  
Author(s):  
J I Katz
Keyword(s):  
Accretion Discs ◽  
Uncertain Parameters ◽  
Periodic Modulation ◽  
Narrow Beam ◽  
X Ray ◽  
Wide Range ◽  
Beam Wandering ◽  
Period Derivative ◽  
X Ray Binaries ◽  
Bursting Activity

Abstract The activity of the repeating FRB 20180916B is periodically modulated with a period of 16.3 days, and FRB 121102 may be similarly modulated with a period of about 160 days. In some models of this modulation the period derivative is insensitive to the uncertain parameters; these models can be tested by measurement of or bounds on the derivative. In other models values of the uncertain parameters can be constrained. Periodic modulation of aperiodic bursting activity may result from emission by a narrow beam wandering within a cone or funnel along the axis of a precessing disc, such as the accretion discs in X-ray binaries. The production of FRB 200428 by a neutron star that is neither accreting nor in a binary then shows universality: coherent emission occurring in a wide range of circumstances.

scholarly journals Stellar Winds in Massive X-ray Binaries

2016 ◽  
Vol 12 (S329) ◽  
pp. 355-358
Author(s):  
Peter Kretschmar ◽  
Silvia Martínez-Núñez ◽  
Enrico Bozzo ◽  
Lidia M. Oskinova ◽  
Joachim Puls ◽  
...  
Keyword(s):  
Compact Object ◽  
High Mass ◽  
Stellar Winds ◽  
X Rays ◽  
X Ray ◽  
Current State ◽  
Wide Range ◽  
Strong Winds ◽  
The One ◽  
X Ray Binaries

AbstractStrong winds from massive stars are a topic of interest to a wide range of astrophysical fields. In High-Mass X-ray Binaries the presence of an accreting compact object on the one side allows to infer wind parameters from studies of the varying properties of the emitted X-rays; but on the other side the accretor’s gravity and ionizing radiation can strongly influence the wind flow. Based on a collaborative effort of astronomers both from the stellar wind and the X-ray community, this presentation attempts to review our current state of knowledge and indicate avenues for future progress.

scholarly journals The Formation of Compact Objects in Binary Systems

1981 ◽  
Vol 93 ◽  
pp. 155-175 ◽  
Author(s):  
E.P.J. van den Heuvel
Keyword(s):  
Mass Transfer ◽  
Binary Systems ◽  
Compact Star ◽  
Compact Objects ◽  
Binary Interaction ◽  
X Ray ◽  
Tidal Forces ◽  
Short Period ◽  
Wide Range ◽  
X Ray Binaries

The various ways in which compact objects (neutron stars and black holes) can be formed in interacting binary systems are qualitatively outlined on the basis of the three major modes of binary interaction identified by Webbink (1980). Massive interacting binary systems (M1 ≳ 10–12 M⊙) are, after the first phase of mass transfer expected to leave as remnants:(i) compact stars in massive binary systems (mass ≳ 10 M⊙) with a wide range of orbital periods, as remnants of quasi-conservative mass transfer; these systems later evolve into massive X-ray binaries.(ii) short-period compact star binaries (P ~ 1–2 days) in which the companion may be more massive or less massive than the compact object; these systems have high runaway velocities (≳ 100 km/sec) and start out with highly eccentric orbits, which are rapidly circularized by tidal forces; they may later evolve into low-mass X-ray binaries;(iii) single runaway compact objects with space velocities of ~ 102 to 4.102 km/sec; these are expected to be the most numerous compact remnants.Compact star binaries may also form from Cataclysmic binaries or wide binaries in which an O-Ne-Mg white dwarf is driven over the Chandrasekhar limit by accretion.

scholarly journals SPH simulations of irradiation-driven warped accretion discs and the long periods in X-ray binaries

2010 ◽  
Vol 401 (2) ◽  
pp. 1275-1289 ◽  
Author(s):  
Stephen B. Foulkes ◽  
Carole A. Haswell ◽  
James R. Murray
Keyword(s):  
Accretion Discs ◽  
X Ray ◽  
X Ray Binaries

scholarly journals Warped accretion discs and the long periods in X-ray binaries

1999 ◽  
Vol 308 (1) ◽  
pp. 207-220 ◽  
Author(s):  
Ralph A. M. J. Wijers ◽  
J. E. Pringle
Keyword(s):  
Accretion Discs ◽  
X Ray ◽  
X Ray Binaries

The X-ray spectral properties of accretion discs in X-ray binaries

1988 ◽  
Vol 324 ◽  
pp. 363 ◽  
Author(s):  
N. E. White ◽  
L. Stella ◽  
A. N. Parmar
Keyword(s):  
Spectral Properties ◽  
Accretion Discs ◽  
X Ray ◽  
X Ray Binaries
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