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Binary system
About: Binary system is a research topic. Over the lifetime, 5788 publications have been published within this topic receiving 97882 citations.
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Chinese Academy of Sciences1, Wuhan University2, California Institute of Technology3, University of Sydney4, University of Amsterdam5, Nanjing University6, University of Utah7, University of Science and Technology of China8, Polish Academy of Sciences9, University of La Laguna10, Spanish National Research Council11, University of California, Berkeley12, Monash University13, INAF14, Xiamen University15, Peking University16, Sun Yat-sen University17, Tsinghua University18, University of Michigan19, Harvard University20
TL;DR: In this paper, the authors reported radial-velocity measurements taken over two years of the Galactic B-type star, LB-1, and found that the motion of the B star and an accompanying Hα emission line require the presence of a dark companion with a mass of about 68 solar masses, which can only be a black hole.
Abstract: All stellar-mass black holes have hitherto been identified by X-rays emitted from gas that is accreting onto the black hole from a companion star. These systems are all binaries with a black-hole mass that is less than 30 times that of the Sun1–4. Theory predicts, however, that X-ray-emitting systems form a minority of the total population of star–black-hole binaries5,6. When the black hole is not accreting gas, it can be found through radial-velocity measurements of the motion of the companion star. Here we report radial-velocity measurements taken over two years of the Galactic B-type star, LB-1. We find that the motion of the B star and an accompanying Hα emission line require the presence of a dark companion with a mass of $${68}_{-13}^{+11}$$ solar masses, which can only be a black hole. The long orbital period of 78.9 days shows that this is a wide binary system. Gravitational-wave experiments have detected black holes of similar mass, but the formation of such massive ones in a high-metallicity environment would be extremely challenging within current stellar evolution theories. Radial-velocity measurements of a Galactic B-type star show a dark companion that seems to be a black hole of about 68 solar masses, in a widely spaced binary system.
90 citations
TL;DR: Investigations of various lidocaine-prilocaine ratios indicate that the two local anesthetics decrease the solubility of each other, however, the totalsolubility is affected only to a minor extent.
89 citations
TL;DR: In this paper, the authors measured the adiabatic compressibilities, β, intermolecular free lengths, Lf, relative associations, RA, excess adiabelatic compressibility, βE, excess free length, LEf, excess molar volumes, VE, and excess viscosities of viscous flow, G∗ E, have been calculated.
89 citations
TL;DR: In this paper, density and viscosity measurements for formamide + methanol (or + ethanol or + 1-propanol) binary systems over the whole concentration range in the temperature range (30 to 50) °C were made.
Abstract: Density and viscosity measurements for formamide + methanol (or + ethanol or + 1-propanol) binary systems over the whole concentration range in the temperature range (30 to 50) °C were made. The experimental results were fitted to empirical equations, whose calculated values are in good agreement with the experimental ones. The data of the mixtures were further used to calculate the excess molar volumes and viscosity deviations. These latter results were fitted by the Redlich-Kister polynomial relation to obtain the coefficients and the standard deviations.
89 citations
TL;DR: Effects of concentration of span 80, concentration of NaOH, stirring speed, composition of feed solution and the volume ratio of the oil phase to the aqueous phase (O/A) were studied both for single and binary system.
89 citations