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A Spreading Layer Origin for Dwarf Nova Oscillations
Anthony L. Piro, Lars Bildsten
Dwarf nova outbursts often show coherent () sinusoidal oscillations with the largest pulsed fraction in the extreme ultraviolet. Called dwarf nova oscillations (DNO…
Neutron Star Crustal Interface Waves
Anthony L. Piro, Lars Bildsten
The eigenfrequencies of nonradial oscillations are a powerful probe of a star's interior structure. This is especially true when there exist discontinuities such as at the neutron…
The Spreading Layer and Dwarf Nova Oscillations
Anthony L. Piro, Lars Bildsten
We describe recent theoretical work on the final stage of accretion when material passes from an accretion disk onto a white dwarf surface. Our calculations focus on understanding…
Spreading of Accreted Material on White Dwarfs
Anthony L. Piro, Lars Bildsten
When a white dwarf (WD) is weakly magnetized and its accretion disk is thin, accreted material first reaches the WD's surface at its equator. This matter slows its orbit as it come…
An XMM-Newton observation of Ark 120: the X-ray spectrum of a `bare' Seyfert 1 nucleus
S. Vaughan, A. C. Fabian, D. R. Ballantyne +3
We report on a long (100 ks) XMM-Newton observation of the bright Seyfert 1 galaxy Arakelian 120. The source previously showed no signs of intrinsic reddening in its infrared-ultra…