Binary system Definition and 49 Threads

In binary star systems, it is said that one of the stars can assume a teardrop shape resulting from the gravitational pull of the companion star. This shape is typically portrayed as asymmetric (i.e., there is no teardrop shape on side of the star away from the companion star). Yet the...

Assume that, in a binary system, one (and only one) of the two stars has a non-zero quadrupole moment. Then the other star feels the usual gravity force $F_g$ plus an additional force $F_q$ coming from the quadrupole potential. On the other hand, the first star feels only the usual gravity force...

Let's assume a binary system with an inclination angle ##i## (angle between the orbital plane and line of sight). Then, according to this source - equations (128) and (129) - for the amplitudes of the tensor polarization modes ("plus": ##+## and "cross": ##\times## polarization) I could write...

Hello I am trying to teach myself some basic maths for astronomy from a book, namely trying to calculate the distance between two stars in a binary system. One thing i am confused with is what angular separation means and how it can be translated to true physical distance between them using...

My best guess right now is use Newton's version of Kepler's 3rd Law to maybe find a combined mass, as I'm under the impression that the smaller star's mass would still be too large to ignore, but I'm not confident. And I wouldn't be sure as where t go from their, either. Any guidance would be...

Homework Statement: A binary star system consists of M1 and M2 separated by a distance D. M1 and M2 are revolving with an angular velocity w in circular orbits about their common center of mass. Mass is continuously being transferred from one star to the other. This transfer of mass causes...

I am reading the following paper on the basic physics of a binary black hole merger: https://arxiv.org/ftp/arxiv/papers/1608/1608.01940.pdf Imagine two black holes orbiting each other until a point they merge. As you can see in Figure 1, the wave period is decreasing and thus the frequency...

Distance is d=1/0.07 = 14.3 parsecs The Doppler shift of one star is, Δλ = 512 - 512.04 = -0.04 So the radical of the velocity of the star is = (-0.04/512) x (3.00 x 10^5 km/s) = 23.4km/s which is the same for both stars because they have the same mass. This is as far as I've got.

Soooo, hi PF, it's been a long time since I needed your help, but here I am again. I've been doing some worldbulding lately and I came up with this idea of a world in which civilisation and life are much, much older than in ours. Yet it isn't as developed due to some kind of natural disaster...

Hi, This is not homework. I need to understand why the binary number system works in the case of a particular problem. While trying to solve the puzzle below, I set out to finding the minimum number of denominations required to create a particular amount. To create any amount up to $15, I just...

Homework Statement A binary stellar system is made of one star with ##M_1=15{M}_\odot## and a second star with ##M_2=10{M}_\odot## revolving around circular orbits at a relative distance of ##d=0.001pc##. At some point ##M_1## explodes in a supernovae leaving a neutron star of mass...

Homework Statement ##\alpha##-Centuary is in a binary visual system with another star. Their separation, from their CM, is 8.0'' and 9.7''. The distance from the Earth is 1.31pc. Their revolution period around the CM is 80.1 years. I have to find masses and luminosities for each star. Homework...

Homework Statement I am having a issue with the question, when I check the solution to the problem, I can't seem to make sense of how they have derived there equation. Q: By analyzing the superposition of frequencies and amplitudes in the radial velocity data for a star 55 Cancri A, the first...

Homework Statement Given a graph (see below) containing the velocities of two stars with respect to the sun, I am asked to calculate the velocity of the centre of mass of a binary system. I am not given the mass of either star, nor the shape of the orbit nor the velocity of the centre of mass...

I am a Physics undergraduate at the University of Texas at Arlington. I am currently taking an Astrophysics class in which my professor talked about the inclination angle of the orbital plane of the binary star system and how it is impossible to determine that angle. I was wondering why is it...

Homework Statement In 2009, astronomers found convincing evidence of two such black holes orbiting as a binary system. From data collected, they estimated that the separation of the black holes was 3.2 × 1015 m and that their masses were 1.6 × 1039 kg and 4.0 × 1037 kg. The black holes orbit...

1. Problem Statement: For the regular solution model, develop the equations for the compositions of the coexisting phases in a binary system and plot the phase boundary as a function of χ/RT.2. This question stems from Sandler's Introduction to Applied Statistical Thermodynamics. The Attempt...

I'm writing a C program to simulate the orbits of a binary system with a 4th order Runge-Kutta method; basically I'm considering the 2 bodies rotating around a fictitious 3rd body(which would be their center of mass) and I turned down the reciprocal gravitational pulls between the bodies to...

Say you have a binary system (with similar mass) in the following orbit with a planet located at the barycenter, is this possible and is this a dynamically stable system (over billion of years) ?? If this system was an Earth like system would I assume correctly that it would not have a nigh...

Dear PF Forum, Sorry for asking two questions in a row. Because I think my next question belongs to a new thread. After all it's Sunday here. My friend told me about Kelt - 4A. Orbitting 3 stars. So, in this galaxy (and universe) if let alone to the law of gravity and chance. 1: Can there be a...

I am reading about mergers of a neutron star with a black hole and the association with GRB. While talking about the accretion disk, the paper I am reading says about the last stable circular orbit. Firstly I thought it was where the Roche limit lies, where mass transfer or matter ejection from...

- We have two identical point masses, they are moving in uniform circular motion and in the same plane. - Both masses are 180 degrees out of phase, they are always on opposite ends of their circular path. -The "orbit" radii for both masses are the same.We consider only SR effects, no GR.Now we...

Homework Statement Plaskett’s binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal. Assume the orbital speed of each star is 220 km/s and the orbital period of each is...

http://www.cnn.com/videos/tech/2015/07/07/black-hole-awakens-erupts-nasa-orig.cnn 8K ly seems awfully close. the cnn version of the story... is a bit thin o_O

which is the first binary star system discovered ever?

From Wiki. The pulsar and its neutron star companion both follow elliptical orbits around their common center of mass. The period of the orbital motion is 7.75 hours, and the two neutron stars are believed to be nearly equal in mass, about 1.4 solar masses. Radio emissions have been detected...

My book says (Foundations of Astrophysics): " The radial velocity ... can be found from the Doppler shift of the star's absorption lines: \nu_{r}=\frac{\Delta\lambda}{\lambda}c If the star you are observing is part of a spectroscopic binary system, you can separate the radial velocity of...

Homework Statement See attachment. Homework Equations The Attempt at a Solution Ok, so for Qd) my attempt was: d = vt = 75x10^3 * (2*2.8*86400*365) = 1.32x10^13 m, (circumference of orbit) because the star periodically shifts from red to blue shifted frequencies every 2.8...

In an X-ray binary system, in which one of the two objects is black hole candidate, there are several ways to exchange mass. A paper states that" their host systems are mass-exchange binaries containing a nondegenerate star that supplies gas to the black hole via a stellar wind or via...

Hi It is stated that: "for a visual binary system, the measured trigonometric parallax is 0.3749+/-0.0057 arcsec." I don't know this angle is parallax of what? I can guess it like this: 0.3749+0.0057 arcsec is the parallax of the whole system when they are at most distance of each other...

Homework Statement Beginning with the kinetic and potential energies of two objects with masses m1 and m2, show that the total energy of a binary system is given by: E=\frac{1}{2}\muv2 - G\frac{M\mu}{r} Homework Equations The one given K =\frac{1}{2}mv2 U = G\frac{Mm}{r} The...

Hi Using the binary system for computing is a natural choice because of its two states: 0 and 1. But is this possible to use base 10, which is used in everyday matters, instead of base 2? Please remember that I'm neither a student of comp. science nor of science/math, in general. Thanks...

Homework Statement Two stars are in a circular visual binary system. The orbital period of the binary is 30 years. The distance to the binary is 20 parsecs. The angular radius of the orbit of each star is 1". What are the masses of the two stars? each star works out to be 4.4 solar...

Hi, I have a rather simple question, how does a binary system with a common center of gravity affect the gravity on both members of the system. If we have a case of a single planet and ignore the star it orbits, the center of gravity should be in the dead middle of that planet. If we...

EDITED: I decided to move the thought experiment that led me to this question to the bottom of this thread. I will first state what my question is. Suppose that we live in a closed universe of three spatial dimensions and this universe is in a state of rapid collapse. Now suppose that all of...

I have to prove that a binary system of stars of equal mass, temp, etc. is brighter by a magnitude of 3/4 than a single star of equal mass, temp, etc. I've been trying to work it out with (m1-m2)=-2.5log(f1/f2) Might anyone be able to tell me if I am even on the right track?

Homework Statement What is the kinetic energy and total mechanical energy of a binary system of identical spheres orbiting around their common center of mass? M = mass R = radius Homework Equations Force of gravity = GM^2/2R K = 1/2MV^2 The Attempt at a Solution I don't know whether...

3. A very cool, faint white dwarf is identified as such from its spectrum and is known to have an apparent visual magnitude, mv = 16.73. A series of observations over several years yields a parallax measurement of 171±2 mas (milli-arcseconds). (i) How far away is the white dwarf, and what...

Homework Statement The spectral lines in a low mass main sequence star show sinusodal velocity variations with an amplitude of 500 km/s and a time period of 10 hours calculate a lower limit to the mass of the unseen binary companion Homework Equations M1 + M2 =...

Homework Statement A binary star is resolved on the sky, the orbit is circular, it has a period of 30 years and the semi-minor and semi-major axes are observed to be 0.5 and 4 arcseconds respectively. If the distance to the system is 10pc, what are the masses of the stars? give an answer in...

Homework Statement Using the conservation of angular momentum and Kelper's third law, show that the relative change in orbital period produced by mass transfer is given by 1/P * dP/dt = 3 dM1/dt * (M1 - M2)/(M1M2) Homework Equations L = mu * sqrt(GMa) P^2 = (4*PI^2)/(G(M1+M2)) * a^3...

Default semimajor axis of binary system help hi, I'm not sure if I am posting in the right place but I could really do with some help figuring out the semi major axis of a binary star system. I have been give the mean distance of each star from the center of mass (star A = 3.96 AU star B =...

Homework Statement 2 solar type stars are in a close binary system. Each indivual star has an apparent brightness of m = 10 mag. Determine the apparent magnitudes of the combined system of the 2 stars assuming they cannot be resolved as individual objects. Determine the minimum brightness...

hey i've been having trouble understanding a part in this question. i'll just map out the basics to the question: 2 stars with a velocity of 220km/s are orbiting at equal distance. the masses of the stars are equal. period = 14.4 days it asks to find the mass of each star. i understand that...

Allright, now we know using the decimal system you can represent any number you want because you use a base 10 system. my question about the binary system is: you can very well represent numbers from 0 to 255 using 8 bits. Now, how can you show that you can represent EVERY number between these 2...

I have this problem: Given is period of an eclipsing binary star system is 34 days, rest wavelength is 6563 angstroms while max doppler shift of 2.34 angstroms I used the doppler equation to figure out the orbital speed of the star; now the question says to use the simplistic model of...

hello, how I can calculate the composition of a gas binary mixture of vinyl chloride and water knowing that I have only the following informations: the water is saturated by the vinyl chloride the pressure of the mixture is 4bars or can you tell me what I have to look as information to...

Q: Suppose that a binary star system consists of two stars of equal mass. They are observed to be separated by 340 million kilometers and take 5.0 Earth years to orbit about a point midway between them. What is the mass of each? I figured out that: mass=4pi^2(radius)^2/Gravitational...

Hi, I have a question about anti-particle. In the modern physics, we "know" (I don't think we really know it) the reason, why the shell electron did not collapse into its ion core, because of quantum theory. But is it possible a electron "circulate" a positron without annihilation. Is there...