The remarkable visual binary system VW Arietis: Chemical composition of its components

1995 ◽  
Vol 107 ◽  
pp. 219 ◽  
Author(s):  
S. M. Andrievsky ◽  
I. V. Chernyshova ◽  
I. A. Usenko ◽  
V. V. Kovtyukh ◽  
V. E. Panchuk ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Binary System ◽  
Visual Binary ◽  
Visual Binary System

scholarly journals How May Seismological Measurements Constrain Parameters of Stellar Structure?

1993 ◽  
Vol 137 ◽  
pp. 554-556
Author(s):  
Timothy M. Brown ◽  
Jørgen Christensen-Dalsgaard ◽  
Barbara W. Mihalas
Keyword(s):  
Binary System ◽  
Structural Parameters ◽  
Stellar Structure ◽  
Pulsation Frequency ◽  
Visual Binary ◽  
Visual Binary System

AbstractPulsation frequency separations, combined with other observations, can constrain the structural parameters of Sun-like stars. As an example, we treat a hypothetical visual binary system resembling α Cen.

scholarly journals 2RE J0241 -- 525: a nearby post-T Tauri visual binary system

1996 ◽  
Vol 281 (3) ◽  
pp. 1001-1015 ◽  
Author(s):  
R. D. Jeffries ◽  
D. A. H. Buckley ◽  
D. J. James ◽  
J. R. Stauffer
Keyword(s):  
Binary System ◽  
Visual Binary ◽  
T Tauri ◽  
Visual Binary System

An Interesting Visual Binary System

1919 ◽  
Vol 31 ◽  
pp. 197
Author(s):  
R. G. Aitken
Keyword(s):  
Binary System ◽  
Visual Binary ◽  
Visual Binary System

The Orbit of the Visual Binary System IIII

1919 ◽  
Vol 31 ◽  
pp. 285
Author(s):  
Robert G. Aitken
Keyword(s):  
Binary System ◽  
Visual Binary ◽  
Visual Binary System

scholarly journals Detection of a white dwarf in a visual binary system

1992 ◽  
Vol 104 ◽  
pp. 1539 ◽  
Author(s):  
Erika Boehm-Vitense
Keyword(s):  
Binary System ◽  
White Dwarf ◽  
Visual Binary ◽  
Visual Binary System

A W UMa variable in the visual binary system ADS 9019 - A UBV photoelectric investigation

1985 ◽  
Vol 90 ◽  
pp. 346 ◽  
Author(s):  
R. L. Walker ◽  
C. R. Chambliss
Keyword(s):  
Binary System ◽  
Visual Binary ◽  
Visual Binary System

Photometric solution of visual binary system: HIP57894

2021 ◽  
Author(s):  
Suhail G. Masda ◽  
A. R. Khan ◽  
J. M. Pathan
Keyword(s):  
Binary System ◽  
Visual Binary ◽  
Photometric Solution ◽  
Visual Binary System

Study of Brightness Variability of the Components of the Visual Binary System 61 Cyg Based on Observations at the Normal Astrograph of the Pulkovo Observatory

Astrophysics ◽  
2018 ◽  
Vol 61 (4) ◽  
pp. 444-457 ◽  
Author(s):  
E. V. Polyakov ◽  
O. O. Vasilkova ◽  
D. L. Gorshanov ◽  
M. A. Pogodin ◽  
N. A. Shakht
Keyword(s):  
Binary System ◽  
Pulkovo Observatory ◽  
Visual Binary ◽  
Brightness Variability ◽  
Visual Binary System

scholarly journals The Chemical Evolution of the Main Component of the Binary System v Sagitarrii

1998 ◽  
Vol 11 (1) ◽  
pp. 390-390
Author(s):  
V. Leushin ◽  
V. Chuvenkov ◽  
L. Snezhko
Keyword(s):  
Chemical Composition ◽  
Binary System ◽  
Core Mass ◽  
Hydrogen Burning ◽  
Convective Mixing ◽  
Mixing Parameters ◽  
Burning Zone ◽  
Nuclear Burning ◽  
Nitrogen Abundance ◽  
Main Component

A model of internal structure and evolution of the peculiar binary system v Sgr is presented. The model corresponds well to the observed chemical composition of the main component atmosphere (10-4 H, 0.844 He, 0.013 C, 0.042 N by mass). It is supposed that about 5 million years ago the main component passed the stage of hydrogen nuclear burning in the shell over the helium core where the helium-carbon reactions took place. Because of convective mixing, the synthesized carbon diffusing into the hydrogen burning zone was catalyzing the reactions of the CN - cycle. This has resulted in anomalies in the chemical composition, particularly high nitrogen abundance in the layer observed now as the atmosphere of the main component since external layers were thrown off during the evolution. Following the calculated results, the quantitative restrictions of temperature and density in the layers and values of mixing parameters are obtained. It is shown that the best agreement with observations exists if the mass of the matter penetrating from the zone of helium-carbon reactions into the helium layer is 0.25 of the helium-carbon core mass. Moreover, the ratio of mass concentration He/C in this matter should equal 2, and the mass share diffusing into the layer of hydrogen burning should be in the range 0.25 - 0.30 of the layer mass.

scholarly journals Physical Parameters and Chemical Composition of Components of the Am-Type Binary System RR Lyncis

1993 ◽  
Vol 138 ◽  
pp. 192-196
Author(s):  
L.S. Lyubimkov ◽  
T.M. Rachkovskaya
Keyword(s):  
Chemical Composition ◽  
Binary System ◽  
Binary Stars ◽  
Spectroscopic Binaries ◽  
Theoretical Modelling ◽  
Physical Parameters ◽  
Accurate Data ◽  
Element Abundances ◽  
Widespread Phenomenon ◽  
Chemical Anomalies

Duplicity is a very widespread phenomenon among Am-stars. For instance, Abt (1961) investigating 25 such stars found out that 22 of them are spectroscopic binaries. However this important phenomenon is ignored usually in chemical composition investigations of Am-stars. Consequently some “mean” element abundances are determined, which can noticeably differ from real abundances in atmospheres of components. Moreover false chemical anomalies can appear, as shown by the theoretical modelling of spectra of binary stars (Lyubimkov, 1989, 1992). Meanwhile accurate data on chemical composition of Am-stars must be considered as observational test for any hypothesis suggested for explanation of these objects.

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