385 citations · 1.5k across the 14 of their papers we have counts for
14 papers
The Crustal Rigidity of a Neutron Star, and Implications for PSR 1828-11 and other Precession Candidates
Curt Cutler, Greg Ushomirsky, Bennett Link
We calculate the crustal rigidity parameter, b, of a neutron star (NS), and show that b is a factor 40 smaller than the standard estimate due to Baym & Pines (1971). For a NS with…
Crustal Emission and the Quiescent Spectrum of the Neutron Star in KS 1731-260
Robert E. Rutledge, Lars Bildsten, Edward F. Brown +3
(Abridged). The type-I X-ray bursting low mass X-ray binary KS 1731-260 was recently detected for the first time in quiescence by Wijnands et al., following an approximately 13 yr…
Propagation of thermonuclear flames on rapidly rotating neutron stars: extreme weather during type I X-ray bursts
Anatoly Spitkovsky, Yuri Levin, Greg Ushomirsky
We analyze the global hydrodynamic flow in the ocean of an accreting, rapidly rotating, non-magnetic neutron star in an LMXB during a type I X-ray burst. Our analysis takes into ac…
Time-Variable Emission from Transiently Accreting Neutron Stars In Quiescence due to Deep Crustal Heating
Greg Ushomirsky, Robert E. Rutledge
Transiently accreting neutron stars in quiescence (Lx<10^34 erg/s) have been observed to vary in intensity by factors of few, over timescales of days to years. If the quiescent lum…
Effect of a neutron-star crust on the r-mode instability
Lee Lindblom, Benjamin J. Owen, Greg Ushomirsky
The presence of a viscous boundary layer under the solid crust of a neutron star dramatically increases the viscous damping rate of the fluid r-modes. We improve previous estimates…
Crust-core coupling and r-mode damping in neutron stars: a toy model
Yuri Levin, Greg Ushomirsky
R-modes in neutron stars with crusts are damped by viscous friction at the crust-core boundary. The magnitude of this damping, evaluated by Bildsten and Ushomirsky (BU) under the a…
Gravitational Waves from Low-Mass X-ray Binaries: a Status Report
Greg Ushomirsky, Lars Bildsten, Curt Cutler
We summarize the observations of the spin periods of rapidly accreting neutron stars. If gravitational radiation is responsible for balancing the accretion torque at the observed s…
Deformations of Accreting Neutron Star Crusts and Gravitational Wave Emission
Greg Ushomirsky, Curt Cutler, Lars Bildsten
Motivated by the narrow range of spin frequencies of nearly 20 accreting neutron stars, Bildsten (1998) conjectured that their spin-up had been halted by the emission of gravitatio…
Constraints on the Steady-State R-mode Amplitude in Neutron Star Transients
Edward F. Brown, Greg Ushomirsky
Recent observations suggest that neutron stars in low-mass X-ray binaries rotate within a narrow range of spin frequencies clustered around 300 Hz. A proposed explanation for this…
Viscous Boundary Layer Damping of R-Modes in Neutron Stars
Lars Bildsten, Greg Ushomirsky
Recent work has raised the exciting possibility that r-modes (Rossby waves) in rotating neutron star cores might be strong gravitational wave sources. We estimate the effect of a s…
Rapid Rotation and Nonradial Pulsations: Kappa-Mechanism Excitation of G-Modes in B Stars
Greg Ushomirsky, Lars Bildsten
Several classes of stars (most notably O and B main-sequence stars, as well as accreting white dwarfs and neutron stars) rotate quite rapidly, at spin frequencies greater than the…
Oceanography of Accreting Neutron Stars: Non-Radial Oscillations and Periodic X-Ray Variability
Lars Bildsten, Andrew Cumming, Greg Ushomirsky +1
Observations of quasi-periodic oscillations (QPOs) in the luminosity from many accreting neutron stars (NS) have led us to investigate a source of periodicity prevalent in other st…
Light Element Depletion in Contracting Brown Dwarfs and Pre--Main-Sequence Stars
Greg Ushomirsky, Christopher D. Matzner, Edward F. Brown +3
We present an analytic calculation of the thermonuclear depletion of the light elements lithium, beryllium, and boron in fully convective, low-mass stars. Under the presumption tha…
Lithium Depletion in Fully Convective Pre-Main Sequence Stars
Lars Bildsten, Edward F. Brown, Christopher D. Matzner +1
We present an analytic calculation of the thermonuclear depletion of lithium in contracting, fully convective, pre-main sequence stars of mass M < 0.5 M_sun. Previous numerical wor…