NASA’s Chandra X-ray Observatory has confirmed that close encounters between stars form X-ray emitting, double-star systems in dense globular star clusters — spherical collections of hundreds of thousands of stars. These double-star systems have a different birth process than their cousins outside globular clusters, and should have a profound influence on the cluster’s evolution. The Marshall Center manages the Chandra program.
Chandra´s unique ability to precisely locate and resolve individual X-ray sources in 12 globular clusters in our galaxy has given astronomers a crucial clue as to the origin of these sources, including two clusters known as NGC 6266 (or M62) and NGC 7099 (or M28).
A team of scientists led by David Pooley of the Massachusetts Institute of Technology in Cambridge took advantage of Chandra’s unique ability to precisely locate and resolve individual sources to determine the number of X-ray sources in 12 globular clusters in our Galaxy. Most of the sources are binary systems containing a collapsed star such as a neutron star or a white dwarf star that is pulling matter off normal, Sun-like companion star.
"We found that the number of X-ray binaries is closely correlated with the rate of encounters between stars in the clusters," said Pooley. "Our conclusion is that the binaries are formed as a consequence of these encounters. It is a case of nurture not nature."
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