Dutch researcher Steve van Straaten set a record during his doctoral research. The researcher registered the fastest ever change in the X-ray emission originating from a binary star. The record-breaking binary star consists of a neutron star and a lighter companion star.
Astronomer Steve van Straaten studied the time variations in the X-ray emission from various binary stars. He found that one of the binary stars had a vibrational frequency of 1330 Hz. This means that the intensity of the X-rays emitted changes 1330 times per second. That is the highest frequency ever measured for such a variation. The researcher used this information to determine the upper limit for the size and mass of the neutron star.
Neutron stars consist of the most compacted material in our universe. They have a mass comparable to that of our sun but they are about one quadrillion times smaller. If a neutron star and a normal star rotate around each other, matter can pass from the normal star to the neutron star. This happens as soon as the gravitational force of the normal star is no longer strong enough to stop its outer layers from being pulled away by the attractive force of the neutron star.
Sonja Jacobs | NWO
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