scholarly journals The BANANA Survey: Spin-Orbit Alignment in Binary Stars

2011 ◽  
Vol 7 (S282) ◽  
pp. 397-398 ◽  
Author(s):  
Simon Albrecht ◽  
J. N. Winn ◽  
D. C. Fabrycky ◽  
G. Torres ◽  
J. Setiawan
Keyword(s):  
Binary Stars ◽  
Binary Systems ◽  
Planet Formation ◽  
Close Binary ◽  
Spin Orbit ◽  
Eclipsing Binary ◽  
System Parameters ◽  
Close Binary Systems ◽  
Orbital Axis

AbstractBinaries are not always neatly aligned. Previous observations of the DI Herculis system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here, we report on our ongoing survey to measure relative orientations of spin-axes in a number of eclipsing binary systems.These observations will hopefully lead to new insights into star and planet formation, as different formation scenarios predict different degrees of alignment and different dependencies on the system parameters. Measurements of spin-orbit angles in close binary systems will also create a basis for comparison for similar measurements involving close-in planets.

scholarly journals Internal magnetic fields, spin-orbit coupling, and orbital period modulation in close binary systems

2019 ◽  
Author(s):  
A F Lanza
Keyword(s):  
Orbital Period ◽  
Binary Systems ◽  
Orbit Coupling ◽  
Close Binary ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Active Components ◽  
Momentum Exchange ◽  
Hot Jupiters ◽  
Close Binary Systems

Abstract We introduce a new model to explain the modulation of the orbital period observed in close stellar binary systems based on an angular momentum exchange between the spin of the active component and the orbital motion. This spin-orbit coupling is not due to tides, but is produced by a non-axisymmetric component of the gravitational quadrupole moment of the active star due to a persistent non-axisymmetric internal magnetic field. The proposed mechanism easily satisfies all the energy constraints having an energy budget ∼102 − 103 times smaller than those of previously proposed models and is supported by the observations of persistent active longitudes in the active components of close binary systems. We present preliminary applications to three well-studied binary systems to illustrate the model. The case of stars with hot Jupiters is also discussed showing that no significant orbital period modulation is generally expected on the basis of the proposed model.

scholarly journals Mass loss from interacting close binary systems

1981 ◽  
Vol 59 ◽  
pp. 431-456
Author(s):  
Mirek J. Plavec
Keyword(s):  
Mass Transfer ◽  
Mass Loss ◽  
Binary Stars ◽  
Binary Systems ◽  
Close Binary ◽  
Important Process ◽  
Close Binary Systems ◽  
Complex Process ◽  
General Complex ◽  
Mass Outflow

AbstractMass outflow from interacting close binary systems, accompanied by loss of orbital angular momentum, appears to be a very important process affecting the evolution of binary stars. Together with accretion on the mass-gaining component, it is the least understood aspect of the general complex process we call “evolution with mass transfer and/or mass loss”, or, more briefly, “interaction”. It is therefore very imperative to assemble and examine all available facts or hints about mass loss.

scholarly journals Scanner observations of some close binary systems

1986 ◽  
Vol 118 ◽  
pp. 261-263
Author(s):  
D. J. Sullivan ◽  
M. Walkington ◽  
E. Budding
Keyword(s):  
Light Curve ◽  
Binary Systems ◽  
Light Curves ◽  
Close Binary ◽  
Eclipsing Binary ◽  
Close Binary Systems

Using our intermediate bandwidth photometric scanner, we have obtained light curve data at a range of spectral intervals for a number of close eclipsing binary systems. This paper reports briefly on the instrumentation system, the data obtained for two of the variables AE Phe and ε CrA, and a preliminary modelling of the light curves.

scholarly journals The Formation of Close Binary Stars

2001 ◽  
Vol 200 ◽  
pp. 23-32 ◽  
Author(s):  
Ian A. Bonnell
Keyword(s):  
Binary Stars ◽  
Binary Systems ◽  
Initial Conditions ◽  
Massive Stars ◽  
Close Binary ◽  
Formation Mechanisms ◽  
Close Binary Systems ◽  
Close Binary Stars ◽  
Orbital Migration

I review the possible formation mechanisms of close binary stars. The formation of close binary systems is problematic in that there is no theory that does not encounter significant difficulties or unknowns. Fission does not appear to occur in stars. Capture is unlikely to form many close binary systems except possibly amongst massive stars. Fragmentation can form close binary systems but these need to accrete the majority of their eventual mass. Furthermore, there appears to be a limited window in initial conditions that may preclude forming sufficient systems in this way. Possible alternatives include the orbital migration of a binary due to its circumbinary disk and the disintegration of a non-hierarchical multiple system.

scholarly journals 42. Close Binary Stars

1985 ◽  
Vol 19 (1) ◽  
pp. 584-606
Author(s):  
A. H. Batten ◽  
J. Smak ◽  
K. D. Abhyankar ◽  
J. Andersen ◽  
A. M. Cherepashchuk ◽  
...  
Keyword(s):  
Binary Stars ◽  
Binary Systems ◽  
Close Binary ◽  
The Past ◽  
Close Binary Systems ◽  
Rate Of Growth ◽  
Natural Development ◽  
Close Binary Stars ◽  
The Subject ◽  
High Level

Research on close binary systems has continued at a high level during the past triennium, although the rate of growth is noticeably slower – probably reflecting the cutbacks in funds to which many of us are subject. There have also been changes of emphasis within the field, which are commented on in the pages that follow. These reflect both changing opportunities for observation and the natural development of the subject. In many areas, the time is ripe for a more critical look at ideas that previously seemed adequate.

Dynamics of Close Binary Systems; Double Stars; and Interacting Binary Stars

Physics Today ◽  
1979 ◽  
Vol 32 (9) ◽  
pp. 71-72
Author(s):  
Z. Kopal ◽  
W. D. Heintz ◽  
J. Sahade ◽  
F. R. Wood ◽  
Frank H. Shu
Keyword(s):  
Binary Stars ◽  
Binary Systems ◽  
Close Binary ◽  
Double Stars ◽  
Close Binary Systems

scholarly journals Robo-AO and SOAR High-Resolution Surveys of Exoplanet Hosting Stars

2021 ◽  
Vol 8 ◽  
Author(s):  
Carl Ziegler ◽  
Nicholas Law ◽  
Christoph Baranec ◽  
Reed Riddle ◽  
Andrei Tokovinin
Keyword(s):  
High Resolution ◽  
Binary Stars ◽  
Binary Systems ◽  
Imaging System ◽  
Close Binary ◽  
The Past ◽  
Close Binary Systems ◽  
Resolution Imaging ◽  
Exoplanet Systems

In the past decade, space-based transit surveys have delivered thousands of potential planet-hosting systems. Each of these needs to be vetted and characterized using follow-up high-resolution imaging. We perform comprehensive imaging surveys of the candidate exoplanets detected by the Kepler and TESS missions using the fully autonomous Robo-AO system and the largely autonomous SOAR speckle imaging system. The surveys yielded hundreds of previously unknown close binary systems hosting exoplanets and resulted in verification of hundreds of exoplanet systems. Evidence of the interaction between binary stars and planetary systems was also detected, including a deep deficit of planets in close binary systems.

scholarly journals Close Binary Stars in Planetary Nebulae through Gaia EDR3

2021 ◽  
Vol 7 (1) ◽  
pp. 40
Author(s):  
Iker González-Santamaría ◽  
Minia Manteiga ◽  
Carlos Dafonte
Keyword(s):  
Big Data ◽  
Binary Stars ◽  
Binary Systems ◽  
Planetary Nebulae ◽  
Statistical Test ◽  
Close Binary ◽  
Close Binary Systems ◽  
Close Binary Stars ◽  
Stellar Envelopes ◽  
Central Stars

The aim of this work is to search for evidence of close binary stars associated with planetary nebulae (ionized stellar envelopes in expansion) by mining the astronomical archive of Gaia EDR3. For this task, using big data techniques, we selected a sample of central stars of planetary nebulae from almost 2000 million sources in an EDR3 database. Then, we analysed some of their parameters, which could provide clues about the presence of close binary systems, and we ran a statistical test to verify the results. Using this method, we concluded that red stars tend to show more affinity with close binarity than blue ones.

Some Results of the Spectroscopic Study of Four Close Binary Systems of Early Spectral Types

1965 ◽  
Vol 5 ◽  
pp. 120-130
Author(s):  
T. S. Galkina
Keyword(s):  
Spectroscopic Study ◽  
Spectral Type ◽  
Spectroscopic Investigation ◽  
Binary Systems ◽  
Quantitative Information ◽  
Close Binary ◽  
Physical Parameters ◽  
Absorption And Emission ◽  
Close Binary Systems ◽  
Quantitative Estimates

It is necessary to have quantitative estimates of the intensity of lines (both absorption and emission) to obtain the physical parameters of the atmosphere of components.Some years ago at the Crimean observatory we began the spectroscopic investigation of close binary systems of the early spectral type with components WR, Of, O, B to try and obtain more quantitative information from the study of the spectra of the components.

Sign in / Sign up

Export Citation Format

Share Document