Mass loss and orbital period decrease in detached chromospherically active binaries

Abstract

The secular evolution of the orbital angular momentum (OAM), the systemic mass $(M=M_1+M_2)$ and the orbital period of 114 chromospherically active binaries (CABs) were investigated after determining the kinematical ages of the sub-samples which were set according to OAM bins. OAMs, systemic masses and orbital periods were shown to be decreasing by the kinematical ages. The first order decreasing rates of OAM, systemic mass and orbital period have been determined as $\dot{J}=3.48\times 10^{-10}y{r}^{-1}$ per systemic OAM, $\dot{M}=1.30\times 10^{-10}y{r}^{-1}$ per systemic mass and $\dot{P}=3.96\times 10^{-10}y{r}^{-1}$ per orbital period respectively from the kinematical ages. The ratio of $d\log J/d\log M=2.68$, which were derived from the kinematics of the present sample, implies that there must be a mechanism which amplifies the angular momentum loss $\bar{A}=2.68$ times in comparison to isotropic angular momentum loss of hypothetical isotropic wind from the components. It has been shown that simple isotropic mass loss from the surface of a component or both components would increase the orbital period.

9 pages, including 3 figures and 3 tables, accepted for publication in MNRAS

References in corpus (2)

• Late-type stars members of young stellar kinematic groups - I. Single stars
• Kinematics of the chromospherically active binaries and evidence of an orbital period decrease in binary evolution

Cited by in corpus (16)

• Dynamical evolution of active detached binaries on log Jo - log M diagram and contact binary formation
• A catalog of chromospherically active binary stars (third edition)
• Physical Properties and Evolutionary States of EA-type Eclipsing Binaries Observed by LAMOST
• Angular momentum and mass evolution of contact binaries
• Extrasolar planet detection by binary stellar eclipse timing: evidence for a third body around CM Draconis
• Origin of W UMa-type contact binaries - age and orbital evolution
• Evolution of the progenitor binary of V1309 Scorpii before merger
• Binary coalescence from case A evolution -- mergers and blue stragglers
• BG Ind: the nearest doubly eclipsing, compact hierarchical quadruple system
• Formation and Evolution of W UMa Stars: Fallacies and Corrections
• X-ray flares on the UV Ceti-type star CC Eridani: a "peculiar" time-evolution of spectral parameters
• X-Ray Superflares on CC Eri
• Analysis of the exoplanet containing system Kepler 91
• A study of the frequency and characteristics of stellar companions and Jupiter-like planets in nearby open clusters
• Photometric analysis and evolutionary stages of the contact binary V2790 Ori
• Modeling blue stragglers in young clusters