Results 41 to 50 of about 491,052 (394)
Production of the entire range of r-process nuclides by black hole accretion disc outflows from neutron star mergers [PDF]
, 2016 We consider $r$-process nucleosynthesis in outflows from black hole accretion discs formed in double neutron star and neutron star -- black hole mergers. These outflows, powered by angular momentum transport processes and nuclear recombination, represent
Meng-Ru Wu +3 more
semanticscholar +1 more source
Power spectra from spotted accretion discs [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractSome aspects of power-spectral densities (PSD) of active galactic nuclei are similar to those of galactic black hole X-ray binary systems (McHardy et al. 2005). The signal originates near a black hole and its modulation by general-relativistic effects should be taken into account (Życki & Nedźwiecki 2005).
Pecháček, T., Dovčiak, M., Karas, V.
openaire +2 more sources
MHD Simulations of Magnetized Stars in the Propeller Regime of Accretion
EPJ Web of Conferences, 2014 Accreting magnetized stars may be in the propeller regime of disc accretion in which the angular velocity of the stellar magnetosphere exceeds that of the inner disc.
Lii Patrick +2 more
doaj +1 more source
Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars [PDF]
Astronomy & Astrophysics, 2019 Many disc-type post-asymptotic giant branch (post-AGB) stars are chemically peculiar, showing underabundances of refractory elements in their photospheres that correlate with condensation temperature. The aim of this paper is to investigate how accretion
Glenn-Michael Oomen +3 more
semanticscholar +1 more source
Flickering in CVs and Accretion Disc Viscosity
Acta Polytechnica CTU Proceedings, 2015 I review observational constraints on accretion disc viscosity inferred from changes of disc structure with time and from disc flickering distributions. The radial run of the disc viscosity parameter in four cases are presented and discussed.
R. Baptista
doaj +1 more source
Evolution of an Accretion Disc in Binary Black Hole Systems [PDF]
, 2016 We investigate evolution of an accretion disc in binary black hole (BBH) systems and possible electromagnetic counterparts of the gravitational waves from mergers of BBHs. Perna et al. (2016) proposed a novel evolutionary scenario of an accretion disc in
S. Kimura +2 more
semanticscholar +1 more source
Dead discs, unstable discs and the stars they surround
EPJ Web of Conferences, 2014 Strong stellar magnetic fields significantly alter the behaviour of surrounding accretion discs. Recent work has demonstrated that at low accretion rates a large amount of mass can remain confined in the disc, contrary to the standard assumption that the
D’Angelo Caroline
doaj +1 more source
Correlated X-ray/ultraviolet/optical variability and the nature of accretion disc in the bare Seyfert 1 galaxy Fairall 9 [PDF]
, 2016 We study multi-wavelength variability of a bare Seyfert 1 galaxy Fairall~9 using \swift{} monitoring observations consisting of $165$ usable pointings spanning nearly two years and covering six UV/optical bands and X-rays. Fairall~9 is highly variable in
Main Pal +3 more
semanticscholar +1 more source
Accretion Disc Viscosity [PDF]
International Astronomical Union Colloquium, 1996 AbstractWe review the various physical processes that could lead to viscosity in accretion discs. A local magnetic dynamo offers the most plausible mechanism and we discuss a simple model in some detail. The dynamo operates even in partially and very weakly ionized discs without much modification.
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Magnetic field structure in accretion columns on HMXB and effects on CRSF
EPJ Web of Conferences, 2014 In accreting neutron star binaries, matter is channelled by the magnetic fields from the accretion disc to the poles of neutron stars forming an accretion mound.
Mukherjee Dipanjan +2 more
doaj +1 more source