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Detection Of The Irradiated Donor In The Lmxbs 4u 1636-536 (=V801 Ara) And 4u 1735-444 (=V926 Sco), J. Casares, R. Cornelisse, D. Steeghs, P. A. Charles, R. I. Hynes, K. O'Brien, T. E. Strohmayer
Detection Of The Irradiated Donor In The Lmxbs 4u 1636-536 (=V801 Ara) And 4u 1735-444 (=V926 Sco), J. Casares, R. Cornelisse, D. Steeghs, P. A. Charles, R. I. Hynes, K. O'Brien, T. E. Strohmayer
Faculty Publications
Phase-resolved VLT spectroscopy of the bursting low-mass X-ray binaries 4U 1636-536/V801 Ara and 4U 1735-444/V926 Sco is presented. Doppler images of the N III λ4640 Bowen transition reveal compact spots which we attribute to fluorescent emission from the donor star and enable us to define a new set of spectroscopic ephemerides. We measure K em = 277 ± 22 and 226 ± 22 kms -1 from the N III spots in V801 Ara and V926 Sco, respectively, which represent strict lower limits to the radial velocity semi-amplitude of the donor stars. Our new ephemerides provide confirmation that light-curve maxima in …
Further Evidence For Variable Synchrotron Emission In Xte J1118+480 In Outburst, R. I. Hynes, E. L. Robinson, K. J. Pearson, D. M. Gelino, W. Cui, Y. Q. Xue, M. A. Wood, T. K. Watson, D. E. Winget, I. M. Silver
Further Evidence For Variable Synchrotron Emission In Xte J1118+480 In Outburst, R. I. Hynes, E. L. Robinson, K. J. Pearson, D. M. Gelino, W. Cui, Y. Q. Xue, M. A. Wood, T. K. Watson, D. E. Winget, I. M. Silver
Faculty Publications
We present simultaneous multicolor infrared and optical photometry of the black hole X-ray transient XTE Jill 8+480 during its short 2005 January outburst, supported by simultaneous X-ray observations. The variability is dominated by short timescales, ∼10 s, although a weak superhump also appears to be present in the optical. The optical rapid variations, at least, are well correlated with those in X-rays. Infrared JHKS photometry, as in the previous outburst, exhibits especially large-amplitude variability. The spectral energy distribution (SED) of the variable infrared component can be fitted with a power law of slope α = -0.78 ± 0.07, where Fν …
Numerical Simulations Of The Onset And Stability Of Dynamical Mass Transfer In Binaries, Mario C.R. D'Souza, Patrick M. Motl, Joel E. Tohline, Juhan Frank
Numerical Simulations Of The Onset And Stability Of Dynamical Mass Transfer In Binaries, Mario C.R. D'Souza, Patrick M. Motl, Joel E. Tohline, Juhan Frank
Faculty Publications
Hydrodynamical simulations of semidetached, polytropic binary stars are presented in an effort to study the onset and stability of dynamical mass transfer events. Initial, synchronously rotating equilibrium models are constructed using a self-consistent field technique and then evolved with an Eulerian hydrodynamics code in a fully self-consistent manner. We describe code improvements introduced over the past few years that permit us to follow dynamical mass transfer events through more than 30 orbits. Mass transfer evolutions are presented for two different initial configurations: a dynamically unstable binary with initial mass ratio (donor/accretor) q 0 = 1.3 that leads to a complete …