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X-ray binary

(Last Updated On: January 27, 2018)

What is X-ray binary

X-ray binary is a class of binary stars. (binary star is a star system consisting of two star orbiting around common barycenter). The x-rays are produced by matter falling from one component, called the donor (usually a normal star), to the other component, called the accretor, which is very compact: a neutrino star or black hole.


x-ray binary
Producing X-ray


X-ray binary are four types-

1. Low-mass X-ray binaries (LMXBs)

2.Intermediate-mass X-ray binaries(IMXBs)

3.High-mass X-ray binaries ((HMXBs)



1. Low-mass X-ray binaries (LMXBs)

In this type X-ray binary a black hole or a neutron star will be star system in one component and in other component fills its Roche Iobe. It is less massive than the other compact object.
Approximately 200 LMXbS have been detected in the milky way.
It emits radiation in X-ray and typically less than 1% in visible light.

Ex.- 4U 1820-30


x-ray binary
Producing X-ray


2. Intermediate-mass x-ray binaries ( IMXBs)

In this type X-ray binary one of the component is a black hole or a neutron star and other is an intermediate-mass star.


3. High-mass X-ray binaries (HMXBs)

In this type X-ray binary one of the component is a black hole or a neutron star and other component is a normal stellar component.
These X-ray binary is very luminous. So they easily detected.

Ex- 1. Cygnus X-1 which was the first identified black hole Candidate.
2. Vela X-1
3. 4U 1700-37


x-ray binary



A. X-ray bursters
B. X-ray pulsars
C. Microquasars

C.  Microquasars

it is important.
It is radio emitting X-ray binary.
This is the smallest cousin of a quasar. quasar and micro-quasar have some common characters.
It is important for the study of relativistic jets.

Ex- 1. SS 443
2. GRS 1915+105
3. Cygnus X-1(very brightest)
4. LSI +61 303


x-ray binary
Producing X-ray

5 thoughts on “X-ray binary

  • June 7, 2016 at 2:07 am

    What is example of IMXBs?

    • June 7, 2016 at 12:40 pm

      IMXBs are typically rather bright x-ray source and can be seen throughout the galaxy. There are only 200 bright IMXBs his already indicates that they must be rather rare objects.

    • April 18, 2017 at 12:24 pm

      Thank you.


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