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Angular Momentum Loss by Magnetic Braking and Gravitational Radiation in Relativistic Binary Stars
K. Yakut, B. Kalomeni, C. A. Tout
Angular momentum loss (AML) mechanisms and dynamical evolution owing to magnetic braking and gravitational radiation in relativistic binary stars (RBS) are studied with use of phys…
Binary Star Origin of High Field Magnetic White Dwarfs
C. A. Tout, D. T. Wickramasinghe, J. Liebert +2
White dwarfs with surface magnetic fields in excess of MG are found as isolated single stars and relatively more often in magnetic cataclysmic variables. Some 1,253 white dwarf…
Alignment Timescale of the Microquasar GRO J1655-40
Rebecca G. Martin, Christopher A. Tout, J. E. Pringle
The microquasar GRO J1655-40 has a black hole with spin angular momentum apparently misaligned to the orbital plane of its companion star. We analytically model the system with a s…
Disc evolution and the relationship between and in T Tauri stars
I. Tilling, C. J. Clarke, J. E. Pringle +1
We investigate the evolution of accretion luminosity and stellar luminosity in pre-mainsequence stars. We make the assumption that when the star appears as…
An Explosive End to Intermediate-Mass Zero-Metallicity Stars and Early Universe Nucleosynthesis
H. B. Lau, R. J. Stancliffe, C. A. Tout
We use the Cambridge stellar evolution code STARS to model the evolution of 5-7 solar mass zero-metallicity stars. With enhanced resolution at the hydrogen and helium burning shell…
The effect of massive binaries on stellar populations and supernova progenitors
John J. Eldridge, Robert G. Izzard, Christopher A. Tout
We compare our latest single and binary stellar model results from the Cambridge STARS code to several sets of observations. We examine four stellar population ratios, the number o…
Impact of Rotation on the Evolution of Low-Mass Stars
D. Brown, M. Salaris, S. Cassisi +1
High precision photometry and spectroscopy of low-mass stars reveal a variety of properties standard stellar evolution cannot predict. Rotation, an essential ingredient of stellar…
The Impact of Rotation on the Evolution of Low-Mass Stars
D. Brown, M. Salaris
High precision photometry and spectroscopy of low-mass stars reveal a variety of properties standard stellar evolution cannot predict. Rotation, an essential ingredient of stellar…
The effect of different opacity data and chemical element mixture on the Petersen diagram
P. Lenz, A. A. Pamyatnykh, M. Breger
The Petersen diagram is a frequently used tool to constrain model parameters such as metallicity of radial double-mode pulsators. In this diagram the period ratio of the radial fir…
On the seismic age of the Sun
G. Houdek, D. O. Gough
We use low-degree acoustic modes obtained by the BiSON to estimate the main-sequence age of the Sun. The calibration is accomplished by linearizing the deviations from a…
Interacting Convection Zones
L. J. Silvers, M. R. E. Proctor
We present results from simulations to examine how the separation between two convectively unstable layers affect their interaction. We show that two convectively unstable layers r…
Alignment and Precession of a Black Hole with a Warped Accretion Disc
Rebecca G. Martin, J. E. Pringle, Christopher A. Tout
We consider the shape of an accretion disc whose outer regions are misaligned with the spin axis of a central black hole and calculate the steady state form of the warped disc in t…
Carbon Rich Extremely Metal Poor Stars: Signatures of Population-III AGB stars in Binary Systems
H. B. Lau, R. J. Stancliffe, C. A. Tout
We use the Cambridge stellar evolution code STARS to model the evolution and nucleosynthesis of zero-metallicity intermediate-mass stars. We investigate the effect of duplicity on…
On Rejuvenation in Massive Binary Systems
L. M. Dray, C. A. Tout
We introduce a set of stellar models for massive stars whose evolution has been affected by mass transfer in a binary system, at a range of metallicities. As noted by other authors…
Hibernation Revived by Weak Magnetic Braking
Rebecca G. Martin, Christopher A. Tout
Cataclysmic variables undergo periodic nova explosions during which a finite mass of material is expelled on a short timescale. The system widens and, as a result, the mass-transfe…
Critical Mass Transfer in Double-Degenerate Type Ia Supernovae
Rebecca G. Martin, Christopher A. Tout, Pierre Lesaffre
Doubly-degenerate binary systems consisting of two white dwarfs both composed of carbon and oxygen and close enough that mass is transferred from the less massive to the more massi…
The C-flash and the ignition conditions of type Ia supernovae
P. Lesaffre, Z. Han, C. A. Tout +2
Thanks to a stellar evolution code able to compute through the C-flash we link the binary population synthesis of single degenerate progenitors of type Ia supernovae (SNe Ia) to th…
A Complete N-body Model of the Old Open Cluster M67
Jarrod R. Hurley, Onno R. Pols, Sverre J. Aarseth +1
The old open cluster M67 is an ideal testbed for current cluster evolution models because of its dynamically evolved structure and rich stellar populations that show clear signs of…
The effect of the 19F(alpha,p)22Ne reaction rate uncertainty on the yield of fluorine from Wolf-Rayet Stars
R. J. Stancliffe, M. Lugaro, C. Ugalde +3
In the light of recent recalculations of the \el{19}{F}(alpha,p)\el{22}{Ne} reaction rate we present results of the expected yield of \el{19}{F} from Wolf-Rayet (WR) stars. We have…
High-Velocity Features: a ubiquitous property of Type Ia SNe
P. A. Mazzali, S. Benetti, G. Altavilla +26
Evidence of high-velocity features such as those seen in the near-maximum spectra of some Type Ia Supernovae (eg SN 2000cx) has been searched for in the available SNIa spectra obse…
The convective Urca process
P. Lesaffre, Ph. Podsiadlowski, C. A. Tout
One possible fate of an accreting white dwarf is explosion in a type Ia supernova. However, the route to the thermonuclear runaway has always been uncertain owing to the lack of a…
A two-stream formalism for the convective Urca process
P. Lesaffre, Ph. Podsiadlowski, C. A. Tout
We derive a new formalism for convective motions involving two radial flows. This formalism provides a framework for convective models that guarantees consistency for the chemistry…
Reconstructing the evolution of white dwarf binaries: further evidence for an alternative algorithm for the outcome of the common-envelope phase in close binaries
G. Nelemans, C. A. Tout
We determine the possible masses and radii of the progenitors of white dwarfs in binaries from fits to detailed stellar evolution models and use these to reconstruct the mass-trans…
Exploring the Divisions and Overlap between AGB and Super-AGB Stars and Supernovae
J. J. Eldridge, C. A. Tout
We discuss the mass ranges over which we find AGB and super-AGB stars. The most massive super-AGB stars are candidate progenitors for type II core-collapse SNe. We discuss the two…