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Related papers: Cataclysmic Variables: An Empirical Angular Moment…

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We give an updated version of the analytical equation of state used in the Cambridge stellar evolution code (STARS) as a free to use open-source package that we have used to model cool white dwarfs down to temperatures…

Solar and Stellar Astrophysics · Physics 2022-04-29 Arnab Sarkar , Christopher A. Tout

Context. For decades, reproducing the orbital period distribution of non-magnetic Cataclysmic Variables (CVs) seemed to require a drastic decrease, usually termed disruption, of angular momentum loss through magnetic braking at the fully…

Solar and Stellar Astrophysics · Physics 2026-04-15 Joaquín A. Barraza-Jorquera , Matthias R. Schreiber , Stuart Littlefair , Diogo Belloni , Axel D. Schwope

A central hypothesis in the theory of cataclysmic variable (CV) evolution is the need to explain the observed lack of accreting systems in the ~2-3 h orbital period range, known as the period gap. The standard model, disrupted magnetic…

We model cataclysmic variables (CVs) with solar metallicity donors ($X=0.7,\:Z=0.02$) that evolve to form AM CVn stars through the Evolved CV formation channel using various angular momentum loss mechanisms by magnetic braking…

Solar and Stellar Astrophysics · Physics 2023-02-02 Arnab Sarkar , Hongwei Ge , Christopher A. Tout

The discrepancies between observations and theoretical predictions of cataclysmic variables (CVs) suggest that there exists unknown angular momentum loss mechanism(s) besides magnetic braking and gravitational radiation. Mass loss due to…

High Energy Astrophysical Phenomena · Physics 2024-10-22 Wen-Shi Tang , Xiang-dong Li , Zhe Cui

Magnetic wind braking drives the spin-down of low-mass stars and the evolution of most interacting binary stars. A magnetic braking prescription that was claimed to reproduce both the period distribution of cataclysmic variables (CVs) and…

Solar and Stellar Astrophysics · Physics 2024-10-10 Valentina Ortúzar-Garzón , Matthias R. Schreiber , Diogo Belloni

We present the results of the study of cataclysmic variables (CVs) and AM Canum Venaticorum (AM CVn) stars with our double dynamo (DD) formalism of angular momentum loss (AML) by magnetic braking (MB). We show that (1) our MB model…

Solar and Stellar Astrophysics · Physics 2024-01-09 Arnab Sarkar , Hongwei Ge , Lev Yungelson , Christopher A. Tout

This article summarizes the basic facts and ideas concerning the formation and evolution of cataclysmic variables (CVs). It is shown why the formation of CVs must involve huge losses of mass and orbital angular momentum, very likely via a…

Astrophysics · Physics 2008-09-11 H. Ritter

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 binary evolution sequences calculated with a Henyey-type stellar…

Astrophysics · Physics 2007-05-23 Ph. Podsiadlowski , Z. Han , S. Rappaport

We review the most decisive currently available measurements of the surface effective temperatures, Teff, of white dwarf (WD) primaries in cataclysmic variables (CVs) during accretion quiescence, and use these as a diagnostic for their time…

Astrophysics · Physics 2011-02-11 Dean M. Townsley , Boris T. Gaensicke

Context. The evolution of cataclysmic variables (CVs) - interacting binaries where a low-mass donor transfers matter to a white dwarf via an accretion disk - is critically controlled by magnetic braking (MB). Significant uncertainties…

Solar and Stellar Astrophysics · Physics 2026-02-06 Bingyao Zhou , Chunhua Zhu , Guoliang Lü , Sufen Guo , Helei Liu , Farkhodjon Khamrakulov

In this third of a series of papers related to cataclysmic variables (CVs) and related objects, we analyse the population of CVs in a set of 12 globular cluster models evolved with the MOCCA Monte Carlo code, for two initial binary…

Astrophysics of Galaxies · Physics 2017-03-07 Diogo Belloni , Mónica Zorotovic , Matthias R. Schreiber , Nathan W. C. Leigh , Mirek Giersz , Abbas Askar

The average white dwarf (WD) masses in cataclysmic variables (CVs) have been measured to significantly exceed those of single WDs, which is the opposite of what is theoretically expected. We present the results of binary population…

Solar and Stellar Astrophysics · Physics 2015-10-28 Matthias R. Schreiber , Monica Zorotovic , Thomas P. G. Wijnen

AM Her variables -- synchronised magnetic cataclysmic variables (CVs) -- exhibit a different period distribution from other CVs across the period gap. We show that non-AM Her systems may infiltrate the longer-period end of the period gap if…

Astrophysics · Physics 2009-11-07 R. F. Webbink , D. T. Wickramasinghe

According to standard evolutionary theory for cataclysmic variables (CVs), angular momentum loss drives CVs to initially evolve from longer to shorter orbital periods until a minimum period is reached (\approx 80 min). At roughly this…

Solar and Stellar Astrophysics · Physics 2011-05-09 Helena Uthas

The NSF's Karl G. Jansky Very Large Array (VLA) is used to observe 122 magnetic cataclysmic variables (MCVs) during three observing semesters (13B, 15A, and 18A). We report radio detections of 33 stars with fluxes in the range 6--8031 uJy.…

Solar and Stellar Astrophysics · Physics 2020-06-16 Paul Barrett , Christopher Dieck , Anthony J. Beasley , Paul A Mason , Kulinder P. Singh

Using available astrometric and radial velocity data, the space velocities of cataclysmic variables (CVs) with respect to Sun were computed and kinematical properties of various sub-groups of CVs were investigated. Although observational…

Astrophysics of Galaxies · Physics 2014-11-20 T. Ak , S. Bilir , S. Ak , K. B. Coskunoglu , Z. Eker

We have carried out an extensive population synthesis study of the ensemble properties of the present-day population of cataclysmic variables (PDCVs) that takes into account the nuclear evolution of high-mass donors close to the bifurcation…

Solar and Stellar Astrophysics · Physics 2016-07-22 J. Goliasch , L. Nelson

Context. Observations of cataclysmic variables in globular clusters appear to show a dearth of outbursts compared to those observed in the field. A number of explanations have been proposed, including low mass-transfer rates and/or moderate…

High Energy Astrophysical Phenomena · Physics 2015-06-12 Natalie Webb , Mathieu Servillat

Cataclysmic variable (CVs) are close interacting binaries in which a white dwarf accretes materials from a low mass main sequence companion. CVs can experience nova eruptions due to low mass transfer rates. In the standard theory of CV…

Solar and Stellar Astrophysics · Physics 2025-07-31 Wenshi Tang , Xiangdong Li , Bo Wang