These four images show an artist's impression of gas accreting onto the
neutron star in the binary system MXB 1730-335, also known as the "Rapid
Burster." Image credit: ESA/ATG medialab › Full image and caption
Scientists observing a neutron star in the "Rapid Burster" system
may have solved a 40-year-old mystery surrounding its puzzling X-ray
bursts.
Discovered in the 1970s, the Rapid Burster is a binary system
comprising a low-mass star in its prime and a neutron star -- the
compact remnant of a massive star's demise. The gravitational pull of
the neutron star strips its companion of some of its gas, which then
forms an accretion disk and spirals toward the neutron star.
Most neutron star binary systems continuously release large amounts
of X-rays, punctuated by additional X-ray flashes every few hours or
days. But scientists have wondered for decades about what accounts for
the Rapid Burster's sudden, erratic and extremely intense X-ray
emissions -- a phenomenon seen only in one other binary system.
In the new study, researchers discovered that the neutron star's
magnetic field creates a gap between the star and the disk around it,
largely preventing it from feeding on matter from its stellar companion.
Gas builds up until, under certain conditions, it hits the neutron star
all at once, producing intense flashes of X-rays.
The new results provide the first evidence for what causes these
so-called "type-II" bursts. The discovery was made with the European
Space Agency's XMM-Newton mission and NASA's NuSTAR (Nuclear
Spectroscopic Telescope Array) and Swift missions.
Full ESA story
News Media Contact
Elizabeth Landau
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-6425
elizabeth.landau@jpl.nasa.gov
Jakob van den Eijnden
Anton Pannekoek Institute for Astronomy, University of Amsterdam, The Netherlands
a.j.vandeneijnden@uva.nl
+31-6-4816-3504
Additional contacts:
Nathalie Degenaar/Anton Pannekoek Institute for Astronomy, University of Amsterdam, The Netherlands--degenaar@uva.nl
+31-20-525-3994
Norbert Schartel/European Space Agency, Villanueva de la Cañada (Madrid)
Norbert.Schartel@esa.int
+34-91-8131-184
Written by C. Mignone/ESA
Source: JPL-Caltech
