Showing papers on "Binary system published in 1975"
TL;DR: In this paper, the further evolution of a massive X-ray binary consisting of a compact object and an OB supergiant is outlined, and the probability for the generation of binary pulsars is very low; in most cases the system is disrupted during the supernova explosion.
Abstract: The further evolution of a massive X-ray binary consisting of a compact object and an OB supergiant is outlined. The supergiant exceeds its critical Roche lobe and a second stage of mass transfer starts. The remnant of the mass losing star — a pure helium star — develops a collapsing iron core and finally undergoes a supernova explosion. If the compact companion is a black hole the system remains bound; if the compact companion is a neutron star the system is disrupted unless an extra kick allowing an asymmetric explosion is given. Computations were performed for the massive binary 22.5M⊙+2M⊙. The possible final evolutionary products are: (1) a black hole and a compact object, in a binary system, (2) two run-away pulsars, (3) a binary pulsar.As final parameters for the described system the eccentricity and period for the recently discovered binary pulsar 1913+16 may be found. An orbital inclination ofi=40° may be derived. The probability for the generation of binary pulsars is very low; in most cases the system is disrupted during the supernova explosion.
46 citations
45 citations
TL;DR: In this article, it was suggested that in a significant fraction of such supernovae the collapsed residue of the explosion may be retained in orbit around the runaway second star, the resultant system being a binary with high eccentricity and large space velocity.
Abstract: RUNAWAY stars are produced when there is a supernova explosion in a close binary system. Usually such an explosion disrupts the binary system, but Gott1 has suggested that in a significant fraction of such supernovae the collapsed residue of the explosion may be retained in orbit around the runaway second star, the resultant system being a binary with high eccentricity and large space velocity. We suggest here that Cir X-1 is such a system.
35 citations
01 Jun 1975
27 citations
TL;DR: In this paper, the Ba-Pb binary system has been completely re-investigated and the equilibrium phase diagram and the crystal structures of the intermediate phases have been determined, including the Ba3Pd5 and Ba2Pb.
Abstract: The Ba-Pb binary system has been completely re-investigated and the equilibrium phase diagram and the crystal structures of the intermediate phases have been determined. In addition to the known compounds BaPb3, BaPb and Ba5Pb3, two other phases have been identified: Ba3Pb5 and Ba2Pb. The former crystallizes in the Pu3Pd5-type structure ( a = 11.148, b = 9.049, c = 11.368 A ) and the latter in the anti-PbCl2-type structure ( a = 10.61, b = 5.71, c = 8.64 A ). A comparison between Ba and Ca in Pb alloy formation has been made and present knowledge of the Ba alloying behaviour with the Group IVB elements is examined.
21 citations
19 citations
TL;DR: In this paper, phase diagrams have been determined using differential thermal analysis for the binary systems CaCl 2 -KCl and CaCl2 -CaCrO 4, where two eutectics have been located at 24.0 mole % KCl (m.p. 615°C) and 74.3 mole % CaCrO4 and melting at 660°C.
18 citations
15 citations
TL;DR: The existence of a metastable solid phase of p-azoxyanisole (PAA) influences the phase diagram of binary mixtures of PAA and PAP and the Schroder-van Laar equations describe the phase diagrams of both systems well using reasonable values of the solid nematic transition energies for the pure components as discussed by the authors.
Abstract: The existence of a metastable solid phase of p-azoxyanisole (PAA) influences the phase diagram of binary mixtures of PAA and p-azoxyphenetole (PAP). In addition to a stable binary system having a eutectic transformation to a nematic phase at 97°C for a PAA mole-fraction (XPAA) of 0.59, a metastable binary (eutectic point at 86°C for XPAA = 0.69) is also observed. The Schroder-van Laar equations describe the phase diagrams of both systems well using reasonable values of the solid-nematic transition energies for the pure components.
14 citations
TL;DR: The diffusional behavior of the ternary partially miscible liquid system acetonitrile-benzene-n-heptane is investigated at 25°C using the diaphragm cell technique as mentioned in this paper.
Abstract: The diffusional behavior of the ternary partially miscible liquid system acetonitrile-benzene-n-heptane is investigated at 25°C using the diaphragm cell technique. The mutual diffusivity of the partially miscible binary system acetonitrile-n-heptane is found to be a strong function of concentration; the concentration dependence is described using a linear relationship. The diffusion coefficient matrix of the ternary system acetonitrile-benzene-n-heptane is determined at a number of points, and the ternary diffusion matrices are found to be significantly coupled with the off-diagonal elements of about 10 to 40% of the main diffusion coefficients.
13 citations
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TL;DR: In this article, it was shown that the recent observations of the eclipsing binary U Cephei have implications for the study of the evolution of binary systems and the understanding of novae.
Abstract: WE believe that our recent observations of the eclipsing binary U Cephei have implications for the study of the evolution of binary systems and the understanding of novae.
TL;DR: In this paper, phase compositions and refractive indices for the isobutane-hydrogen sulfide binary system at 40.1°, 100.0°, 160.2°, and 220.0 degrees were determined.
Abstract: Vapor and liquid equilibrium phase compositions and refractive indices were determined for the isobutane-hydrogen sulfide binary system at 40.1°, 100.0°, 160.2°, and 220.0°F from the vapor pressure of isobutane to the vapor pressure of hydrogen sulfide or to pressures in the critical region for the system. The measured phase compositions and refractive indices were used to calculate the equilibrium phase molal volumes using the Lorentz-Lorenz refractivity relationship. The saturated liquid phase exhibited a minimum in its refractive index at the three lower temperatures.
TL;DR: In this paper, the mass transfer coefficients for the partially miscible binary system and for those ternary experiments in which the slope of the operating line was negative are found to be independent of the driving force.
Abstract: The objective of this work is to experimentally examine mass transfer during liquid-liquid extraction in the system acetonitrile-benzene-n-heptane. The interfacial characteristics of the system are simultaneously investigated. (Part I deals with the diffusion properties of the system).
The mass transfer experiments are conducted in a stirred extraction cell of the Lewis type. The transfer between an unsaturated and nearly saturated phase is studied. The mass transfer coefficients for the partially miscible binary system, and for those ternary experiments in which the slope of the operating line was negative are found to be independent of the driving force. A photographic investigation, which employed the schlieren technique, indicates that Marangoni-type instabilities are absent in such experiments. However, in ternary experiments, in which the slope of the operating line is positive and above a certain critical value the mass transfer coefficients decreases as equilibrium approached. The schlieren results confirm the presence of interfacial turbulence for this case.
The driving-force dependence of the turbulent mass transfer coefficients is explaine using a surface renewal model. The model provides a correlation for the results of ternary experiments in which interfaical turbulence is present.
TL;DR: In this paper, spectroscopic orbital elements are derived for the eclipsing binary IQ Per, and the secondary lines are detected, and a mass ratio and individual masses are inferred, the components are found to be on the main sequence and the system is detached.
Abstract: Spectroscopic orbital elements are derived for the eclipsing binary IQ Per. Faint secondary lines are detected, and a mass ratio and individual masses are inferred. The components are found to be on the main sequence, and the system is detached. Key words: eclipsing binary - radial velocities - orbit
Journal Article•
Journal Article•
TL;DR: In this paper, the experimental results of diffusion and solubility studies of organic solvents and plasticizers into epoxy resins (ER) (polyhydroxylates) are given for a wide range of molecular weights (mol.wt.), temperatures, and compositions of the binary systems.
Abstract: The experimental results of diffusion and solubility studies of organic solvents and plasticizers into epoxy resins (ER) (polyhydroxylates) are given for a wide range of molecular weights (mol.wt.), temperatures, and compositions of the binary systems. The mol.wt. of the ER has been found to greatly affect the diffusion parameters of the binary system at all compositions. In dilute solutions of 0·9⩽ϕ1 (ϕ1-volume fraction of solvent), the dimensions and shape of the diffusing molecules mainly affect the auto-diffusion coefficients of the polymer, while those of the low mol.wt. compounds will be almost independent of the mol.wt. of the macromolecules. At medium composition (0·6⩽ϕ1⩽0·9) the thermodynamic parameters of the binary system determine the nature of the dependence of the autodiffusion coefficient on the mol.wt. of the ER. When ϕ1<0·5, the autodiffusion coefficients will be similar to the autodiffusion values of the solvents and any changes as a function of the mol.wt. of the ER will be related to the changes in internal mobility of the chains in the polymer matrix. The free volume theory is used to suggest a quantitative interpretation of the experimental results.