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Massive Star Mergers: Induced Mixing and Nucleosynthesis
N. Ivanova, Ph. Podsiadlowski
We study the nucleosynthesis and the induced mixing during the merging of massive stars inside a common envelope. The systems of interest are close binaries, initially consisting o…
Hydrodynamical Simulations of the Stream-Core Interaction in the Slow Merger of Massive Stars
N. Ivanova, Ph. Podsiadlowski, H. Spruit
We present detailed simulations of the interaction of a stream emanating from a mass-losing secondary with the core of a massive supergiant in the slow merger of the two stars insi…
A New Class of High-Mass X-ray Binaries: Implications for Core Collapse and Neutron-Star Recoil
E. Pfahl, S. Rappaport, Ph. Podsiadlowski +1
We investigate an interesting new class of high-mass X-ray binaries (HMXBs) with long orbital periods (P_orb > 30 days) and low eccentricities (e <~ 0.2). The orbital parameters su…
Images of an equatorial outflow in SS433
Katherine Blundell, Amy Mioduszewski, Tom Muxlow +2
We have imaged the X-ray binary SS433 with unprecedented Fourier-plane coverage at 6cm using simultaneously the VLBA, MERLIN, and the VLA, and also at 20cm with the VLBA. At both w…
Binary Population Synthesis: Low- and Intermediate-Mass X-Ray Binaries
Philipp Podsiadlowski, Saul Rappaport, Eric Pfahl
As has only recently been recognized, X-ray binaries with intermediate-mass secondaries are much more important than previously believed. To assess the relative importance of low-…
Irradiation Pressure Effects in Close Binary Systems
Sam Phillips, Philipp Podsiadlowski
We present a method for the calculation of the effects of external irradiation on the geometrical shape of the secondary in a close binary containing a compact star, the source of…
Formation of the Black Hole in Nova Scorpii
Ph. Podsiadlowski, K. Nomoto, K. Maeda +3
Israelian et al. (1999) showed that the stellar companion of the black-hole binary Nova Sco is polluted with material ejected in the supernova that accompanied the formation of the…
Cataclysmic Variables with Evolved Secondaries and the Progenitors of AM CVn Stars
Ph. Podsiadlowski, Z. Han, S. Rappaport
We present the results of a systematic study of cataclysmic variables (CVs) and related systems, combining detailed binary-population synthesis (BPS) models with a grid of 120 bina…
The quiescent light curve and evolutionary state of GRO J1655-40
Martin E. Beer, Philipp Podsiadlowski
We present ellipsoidal light-curve fits to the quiescent B, V, R and I light curves of GRO J1655-40 (Nova Scorpii 1994). The fits are based on a simple model consisting of a Roche-…
A general, three-dimensional fluid dynamics code for stars in binary systems
Martin E. Beer, Philipp Podsiadlowski
We describe the theory and implementation of a three-dimensional fluid dynamics code which we have developed for calculating the surface geometry and circulation currents in the se…
Evolutionary Binary Sequences for Low- and Intermediate-Mass X-ray Binaries
Philipp Podsiadlowski, Saul Rappaport, Eric Pfahl
We present the results of a systematic study of the evolution of low- and intermediate-mass X-ray binaries (LMXBs and IMXBs). Using a standard Henyey-type stellar-evolution code an…
Common-Envelope Evolution: the Nucleosynthesis in Mergers of Massive Stars
N. Ivanova, Ph. Podsiadlowski, H. Spruit
We study the merging of massive stars inside a common envelope for binary systems consisting of a red supergiant with a mass of 15-20 Msun and a main-sequence companion of 1-5 Msun…